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4L80E Transmission Problems

Home > Discussion Forum > Mechanic's Corner - Transmissions

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4L80E Transmission Problems Bob 9-27-07  
I have a 1995 GMC 2500 4x4 with 155K. Bought it w/ a bad trans. Found it 2 1/2 qts low on oil. I put in the oil, and did get some forward movement from her, but oil is starting to look brown. Is it terminal?

Also, I found a low milage used 4l80e trans from a 1995 3500 w/ a 7.4 liter big block 4x4. Is this a direct fit? Should I do any shift kit upgrades, I hear the OEM needs improving.....
Re: 4L80E Transmission Problems Paul Carter 12-19-08  
I have a 1994 G30 van with a 4L80E transmission. It's been rebuilt, and still goes into limp mode (stays in 2nd) at random. I have wiggled the ignition switch, checked the fuse, spliced in a test light at the connector, and I am not losing power to the connector. I've checked the solenoids and the wiring with the pan down. Grounding each solenoid produces an audible sound and a slight visible movement. Could I have a bad ECM? I replaced it already from the salvage yard, and now the truck runs perfect, but I had this trans problem before and still do. This is my work truck, and the down time is costing me money. I am not able to replace the truck yet (and besides, what would I learn then?) Does anybody have any other ideas?
Re: 4L80E Transmission Problems Agomez350 1-7-09  
Clean connectors in transmission first
Re: 4L80E Transmission Problems kenny 12-5-08  
1992 pace arrow. 4L80e. No overdrive.
Replaced output speed sensor, coolant temp sensor. Still get 68 for code. No slippage felt in tranny. Rev, 1,2 and 3rd shift fine but no 4th or od.
Any suggestions?
Thanks
Re: 4L80E Transmission Problems Jeremy 3-21-13  
I have a 1996 Chevrolet 3 quarter ton truck with a 5 speed manual when I put it in third gear, the third gear keeps popping out, I can slow it down to 45 miles an hour in third gear it will slow down just fine until I get about 15 miles an hour or less then It will start grinding
Re: 4L80E Transmission Problems fritz 10-29-08  
2000 express 3500 downshifts 4th to 3rd for no reason and "service engine soon" light is on.
Re: 4L80E Transmission Problems jollyfert 1-20-09  
I have a problem with OD on a 96 6.5TD GMC with 225K miles. My OD gear locked up and can only drive in 1St, 2nd, or 3rd.
Had auto scanner reading of slippage on Od after dash "check engin light "came on. Is there a better replacement transmission for this model. I really like this diesel, gotten real good service, need dependable transmission...Any help is appreciated.Ty
Re: 4L80E Transmission Problems manny 11-26-08  
I own a 2000 suburban 2500.At 45 mph i heard a whining loud sound coming from engine compartment.the fan clutch is ok.Can you help?
Re: 4L80E Transmission Problems Rusell Ratliff 1-28-09  
I have a 1995 Chevy 2500, it has the 4L80E transmission,runs on gasoline not Diesel( most say it runs on diesel not gasoline there wrong0. I have p r n OD 3rd 2nd 1st gear. if i put in OD it will not switch to 2nd nor 3rd nor OverDrive. Can ya'll tell me what could be the probelm/
Re: 4L80E Transmission Problems Scott Frye 4-18-09  
I have a 1996 chevy z71 pickup 4x4. The transmission has reverse,first and second.But when in second it trys to shift to third it seems like there is nothing there.Fluid is clean,not burnt,checked fuse and voltage everything good.Please help me!
Re: 4L80E Transmission Problems Richard 4-23-09  
I have a 4l80E on my 02 2500HD 6.0 silverado and have been expeirancing the same no shift into overdive when the tranny is cold. I started complaining to the dealer back in 03 but they kept on insisting that if my message center did not come on, there was no problem. Now that the truck is no longer on warranty and the tranny is cooked,they are all to eager to rebuild it at 3000. a wack. In the end I got so frustrated at the dealer brushing me off that I finally got rid of it and bought a Dodge.
Re: 4L80E Transmission Problems mtvrmechanic 4-10-09  
I have a 91 g30 moving van.Overdrive quit working but goes in all the other gears just fine.We got as far as finding out it's not electrical.I know this is a overdrive version of the th 400 and I've built a few of these.What usually goes out on these is it a drum problem or should I be looking more at the valve body? Jim
Re: 4L80E Transmission Problems Dan 4-10-09  
Trans stuck in forward all times...even when in reverse..when looking at scan tool, transmission shift positon always says 2nd gear.
Anyone have any ideas.?
Re: 4L80E Transmission Problems Bill 3-28-09  
I have a 97 3/4 ton 4x4 that has all the forward gears but no reverse. Changed the fluid and the filter but nothing. Any other suggestions?
Re: 4L80E Transmission Problems Jim Loveless 10-17-08  
1993 C3500,105,000 miles.Shifts hard. Will shift from 1st,2nd and 3rd, but won't shift to 4th.

Thanks

Jim
Re: 4L80E Transmission Problems jay angoco 10-9-08  
I have a 1992 chevy 2wd single cab dually..
supposed to be service truck but 6.2 diesel had messed up injectors so threw out motor and replaced with an 80' model 350 motor...using HEI...
my trans is a 4L80E and i was wondering if there is a switch that controls shifting on the motor...like an idle sensor....the truck can move forward and back yet does not shift at all...wondering if i disconnected any vital wires...left all wiring on trans intact but not sure if i unplugged one from the original motor...any input greatly appreciated....
Re: 4L80E Transmission Problems Frank 12-9-07  
1996 GMC Suburban CK2500 Automatic, 4WD, 454V8. Transmission is dropping out of reverse gear hard when backing out of a slightly sloped driveway. Usually will not pop out if backing up on a level surface. Any suggestions?

Thanks
Re: 4L80E Transmission Problems Warren 12-10-07  
I have a 2003 HD Chevy pick up 2500 series with 40,000 miles. The transmission is toast and is very expensive to fix. Have you heard of any problems with the 480EL transmission?
Re: 4L80E Transmission Problems RUSSELL EUBANKS 11-14-07  
1996 CHEV 6.5 DIESEL 4X4 140000 MILES 4L80E TRANNY. WHILE ON A TRIP NO LOAD,NO TOW......... AFTER ABOUT 5 HOURS OF DRIVING @ 70MPH ENGINE BEGAN REVVING....... STOPPED CHECKED FLUID IT WAS GOOD...... ADVISED IT MIGHT BE SENSORS.....CHANGED THEM...SAME PROBLEM...... GM PARTS MAN SAYS LIKELY IS A BROKEN SPRAG HOUSEING OR SOMETHING LIKE THAT INTERNAL..... ANY IDEAS
Re: 4L80E Transmission Problems wrench 9-29-07  
Check to make sure you got the right oil in the tranny, I run in one which had motor oil put in & would not shift at all, change the oil & flush the convertor, cooler, line & work good now. It's going to cost you 12 quarts of oil & time to do it to know but may save 1K.
wrench
Re: 4L80E Transmission Problems BUBBA THE BUS TECH 9-27-07  
The "E" transmissions change quite rapidly and this trans may by a direct bolt in but the wiring may not due to possible changes. Need to check with a wrecker that is willing to look this up in his will fit cross refrence. A big block trans may have minor difrences such as lower stall converter etc. As to upgrades, I belive a "shift kit" Or " Reprogram kit" can help get the trany to survive. Unless you are racing going to any more agressive than stage 1 or mild is a waste. Good Luck.
Re: 4L80E Transmission Problems Den 12-29-07  
Have a 97 Gm Pickup, and access to scan tool. 4L80E Trans. has 2nd gear and reverse only.The trans.starts in 2nd gear and will not shift higher or lower.Changed the ignition switch/wiring harness assembly,no difference.TPS checks out OK.....and what happened after this is puzzling.

I went under the truck and disconnected the large round multi-pin wiring harness at left rear of transmission,re-connected it, test drove the truck and trans. started in 1st and went through all the shifts normally and to O.D. Thought I had it, but after a few blocks it went back to 2nd gear only.Tried disconnect and connect again of harness,shifted Ok for a few blocks... and then back to 2nd gear only again.
This is definetely an electrical problem.From the beginning we have noticed the orange engine service light does not come on every time the key is switched from off to on... and it should. Gm trans. Tech told me the ECM for those model years are not a problem. Has anyone encountered this type of trans.issue with the 4L80E?

Den
Re: 4L80E Transmission Problems Murray Frater 3-22-08  
Hi from New Zealand I have 1994 fleetwood flair with a chev 6.5td RV with a 4 speed auto trans it appears that the torque converter is not locking up as when I am travelling at 60mph on the flat road and take my foot off the throttle the enging revs drop to 1000rpm any help would be appreciated.
Sincererly Murray Frater
Re: 4L80E Transmission Problems Chuck harkey 8-18-08  
I have a chevy 2000 express 3/4 ton, the 1st problem, at 32000,miles trans, would slam or bang when shifting & while driving it seened like it was in 2nd or 3rd I had it checked out, oil & trans, checked ok. I took a trip & it started again,then I was goin up a steep grade, I lost over drive and reverse. now when trying reverse it will go into gear, but it makes strange noise then all the sudden goes into reverse gear after a few seconds, this happens mostly when trying to back out when on a sloap. over drive has same problem like its not goin all the way into gear, I can drive in 3,2,1 with no problemsat all?
Re: 4L80E Transmission Problems Kevin 9-6-08  
I have a 1997 chevy express. I have every forward gear but reverse dosen't work any sugestions
Re: 4L80E Transmission Problems frank 7-27-08  
1995 6.5 diesel 4l80e trans works fine except od. won't go into 4 th gear any tips??
Re: 4L80E Transmission Problems Brad Roberts 5-21-08  
Have rebuilt transmission twice both times i have the same problems, has reverse but acts if it starts of in second and will not shift any futher, it also will lock up when i down shift it, i have unpluged all sensors at the same time and tryed it but the same thing happens can someone help with this problem thank you.
Re: 4L80E Transmission Problems dave 4-19-08  
I have a 6.5 desiel with the 4l80e trans.i have reverse but no forward.it started slow.i could take off and it would take a bit to grab,when it grabs,i'm ok till i take it out of gear,then i have to start over againg and nurse the trans till it grabs again.do tou have any thoughts on what i can do to fix the problem.thanks
Re: 4L80E Transmission Problems Mark 5-5-09  
I also have a problem with a 4L80 trans defaulting to 2nd gear.The trans is a rebuilt and I just put it in.This is a 95 3500 series w/5.7.I used a break out box to see if it was trans at fault but its not.It shifted fine.I then checked the wiring from the computer plug to the trans plug and input sensor and they all rang out for continuity.Since I have a twin truck in the yard I swapped out the computer and I still get a default to 2nd gear.This is an OBD-1 system and no check light is lit.I put an OTC scanner on the computer for transmissions and a code of 81 comes up for 2 and 3 shift solinoids.I also put a pressure gauge and found the trans pressure too high.(125lbs) in park).Now here is the kicker.I erase the code,the pressure drops and the truck shifts fine.I shut the truck off for a couple hours and it defaults to 2nd gear.I rechecked the solinoid wires and there ok.I also checked the engine sensors that were required by the trans and there all in spec.Where do I go from here?
Re: 4L80E Transmission Problems john 11-11-08  
My 2003 chevy 2500 wont go into reverse but all the forward gears work perfect. If somone knows please email me. Thanks
Re: 4L80E Transmission Problems mike 8-1-10  
I have an 06 chevy truck that the transmission was leaking around pan gasket and decided to replace filter and gasket and now the transmisson shifts fine but when i go down steep hills and let off the gas it make a hissing or blowing sound never had any problems with it until change filter and gasket.
Re: 4L80E Transmission Problems brian 12-5-10  
My truck will sometimes stay in 3rd when i put it in drive and othertimes it will work fine. the newest thing is that it will shift good then stay in 3rd gear it has codes for the tcc,1-2,2-3 solenoids so i changed them and the harness what else can it be no other codes the truck is a 2003 1500hd 2wd with 72000
Re: 4L80E Transmission Problems Luis Torres 6-24-10  
I have 6.5 td with 4L80E from first to second shift kick hard same from 3th to 4th, need a help
Re: 4L80E Transmission Problems Philip Myers 6-21-10  
I own a 1996 Bounder 34J with the 7.4 engine 4L80E trans. After driving a while,the smallest incline will cause transmission to downshift,losing speed,and the engine overrevs.At this time,the throttle is super sensitive in relation to it shifting from 3rd to OD.Once you stop,it goes through all the gears just fine.But once it gets to OD there is absolutely no torque and it almost seems like its between gears.There is no difference when manually shifting. Changed input and output sensors,filter and used Valvoline Maxlife Fluid problem still exists.No Engine Codes... I need help with this
Re: 4L80E Transmission Problems tim luther 2-12-10  
I have a 2000 chevy 3/4 fourwheel drive. i do plow with it and never had a problem with the tranny, but now reverse is out. all the other gears work fine. i notice other people seem to have the same issues, is this electrical???
Re: 4L80E Transmission Problems r armstrong 4-15-10  
2001 bently red badge wont select reverse when hot have to rev motor to get it to engage
Re: 4L80E Transmission Problems Heidi 2-5-11  
I have a 1997 chevy ton 4x4 with a 4L80e tranny...it will shift sometimes from 1st to 2nd and then drop down into 1st again. If you unplut it and reset the computer it will shift again.Can anyone tell me some information? Do i need to replace the tranny or is it a sensor? I was told it sounded like it could be the input and ouput sensors????????
Re: 4L80E Transmission Problems Jerry 7-27-11  
I have a 1995 chevy 3/4 ton with a 4L80E in everything has been rebuilt brand new two weeks ago. When I left the tranny shifted fine thru all gears but after 15 miles the tranny then down shifted to passing gear and never returned to over drive. But If i let the truck set over night and drive it, it will shit thru all gears and then after 10 or so miles it will down shift and never return to overdrive. The fluid is full and red still its not burnt and i have good fluid flow to the aftermarket cooler i have on it. What else could be the problem?
Re: 4L80E Transmission Problems Mark 5-5-09  
I also have a problem with a 4L80 Trans defaulting to 2nd gear. The Trans is a rebuilt and I just put it in. This is a 95 3500 series w/5.7.I used a break out box to see if it was Trans at fault but its not. It shifted fine. I then checked the wiring from the computer plug to the Trans plug and input sensor and they all rang out for continuity. Since I have a twin truck in the yard I swapped out the computer and I still get a default to 2nd gear. This is an OBD-1 system and no check light is lit. I put an OTC scanner on the computer for transmissions and a code of 81 comes up for 2 and 3 shift solinoids.I also put a pressure gauge and found the trans pressure too high.(125lbs) in park).Now here is the kicker. I erase the code, the pressure drops and the truck shifts fine. I shut the truck off for a couple hours and it defaults to 2nd gear. I rechecked the solenoid wires and there ok.I also checked the engine sensors that were required by the Trans and there all in spec. Where do I go from here?
Re: 4L80E Transmission Problems ROB 10-15-12  
98 SILVERADO 6.5 TURBO DEISLE WONT GO IN REVERSE BUT ALL FORWARD GEARS WORK FINE ANY IDEAS....
Re: 4L80E Transmission Problems tony ghigo 4-15-12  
My 480 tranny is downshifting allthe way to 1st gear and the engine revs very highplease helpme
Re: 4L80E Transmission Problems Chris 11-20-11  
1996 2500k 454 started slipping out of gear on deceleration, then backing out over dip, now wont go into 4wd, but 4wd light comes on like it is in 4wd? Help!
Re: 4L80E Transmission Problems everardo 9-17-11  
I have a 1993 suburban 2500 when the truck is cold it run hard I need to let go of the
gas so it goes in 2nd gear when I got it it didn't have oil in the transmisson I could not back up but when I play with the 4x4 I can back up I don't know why ?
Re: 4L80E Transmission Problems Rick 2-2-10  
This must be the nature of these tranny's shifting hard out of first gear into second. Mine didnt start doing this until I had the motor replaced...is something knocked off or not hooked up right?
Re: 4L80E Transmission Problems charles peters 10-12-12  
I have A 1997 K3500. I loose overdrive at random. It use to just happen when the tranny got hot, so I thought. Now it happens whenever it wants. If I stop and shut the truck off, I get overdrive back. Please help.
Re: 4L80E Transmission Problems angelo 1-27-10  
I have a 1997 step van ucbc w diesel dually rear no pto eng. [4l80e]it first started to jump out of gear when it went to overdrive at 55 mph and would act like it was in neutral untill i slowed down to 30 mph then back into gear untill it went above 55 mph then fly out again as if someone shifted to neutral,now it wont go into 2nd gear so i cant go above 30 mph please help ! should i try to replace the input and output sensors ?? there is no trans light on the dash. there is a yellow tag on the side of the unit.
Re: 4L80E Transmission Problems Brayden 9-1-09  
Scott Frye, did you figure out the problem with your trans? because my 98 silverado is doing the exact same thing
Re: 4L80E Transmission Problems Bob 7-31-09  
I blew a trans cooler line on 92 chev g30 van w/6.2 diesel. I fixed line and replaced fluid but trans won't go forward or back. Also now the engine is smoking white. I tried unpluging the ECM and repluging in.
Re: 4L60 Transmission Problems Angela 7-20-09  
I am searching for some help with rebuilding a 1994 GMC Z71 (4L60) transmission. I have been told that the "sprag" gear may be out. The transmission was apparently rebuilt not too long ago, but the previous owner of the truck got it stuck and apparently wore out the gear. The truck will move in reverse but will not go forward at all. If anyone could help give me some advice, I would greatly appreciate it!!
Re: 4L80E Transmission Problems david 7-14-09  
I have a 99 express 3500 cargo van. 70.000 miles never had any transmission problems till my speedometer started acting up. i tried both speed sensors on the drivers side of the transmission with no luck. also get no codes whatsoever im thinking a wiring harness problem,but am not sure how to go about testing it. has anyone had this problem?
Re: 4L80E Transmission Problems dusten 7-16-09  
I have a 1992 chevy G30 bluebird school bus the transmission has a problem with slippage it has 130,000 miles and it only slips when its warmed up any ideas
Re: 4L80E Transmission Problems Leonard 9-14-09  
Trans was shifting hard in all gears, removed and rebuilt, now it is stack shifting. Insall new tps please help
Re: 4L80E Transmission Problems Shawn 8-3-09  
I bought this 1995 Chevy 2500 4x4 new and it has a 4l80e transmission. It has been rebuilt twice now(by a very reputable garage).1st time I lost 1st &3rd, 2nd time I lost all my forward gears and now the truck is in my garage waiting for me to do something with it. Is it true that the only years of this particular tranny will only swap out with a 1995? If I switch over to a standard- will a 1993 Getrag 5 speed 4x4 work? I was told it would if the transfercase bolt holes is at 12 oclock? Are these trannys junk?!
Re: 4L80E Transmission Problems Denis 12-25-09  
I have a 1996 6.5 turbo diesel. After slamming the brakes the other day my rev don't go down when I press the brake pedal, truck idel about 200rpm to fast but my big problem is that I goes in and out of overdrive 1,2,3,r all work ok. sensor or wire ?
Re: 4L80E Transmission Problems chuck 10-5-09  
4L80E automatic trans. 6.5L diesel. I have no reverse but all other gears work fine??
Re: 4L80E Transmission Problems Bobby 12-18-09  
My 95 chevy 2500 3/4 pick up reverse stopped working but all forward on auto transmission work great. Does any one have a fix. Does this transmission have bands for reverse?
Re: 4L80E Transmission Problems Harold 11-22-09  
I have a G30 van with a 4l80e trans, on the up shift it goes from 1st to 3rd, missing 2nd. When slowing or turning it down shifts from 3rd all the way back to 1st.Is it in the sun or shell gear or could it be a selonid switch or even something to do with the computer. Thanks for any help.
Re: 4L80E Transmission Problems claude 11-19-09  
I have a 97 gmc suburban 4wd and reverse is out and wont go into overdrive
Re: 4L80E Transmission Problems george follett 1-1-10  
I992 chevy small rv everything worked fine [except cruise] until it had a heavy smoke damage.pro cleaned where they could,after complete restoration,overdrive comes and goes.van had no heat damage only severe smoke.wipers would activate when starting,1 wipe and stop.that stoped.fast idle can be slowed by moving wiper switch.what controls od?before fire it would shift solid into od at 55.never kicked down,but all gears shift good except in and out of od constantly help!!
Re: 4L80E Transmission Problems Jay 4-9-09  
I got 96 3/4 ton chevy truck 2500, 2wd and the problem trany don't shift after thrid, and sometimes stuck on second gear intermittently, I noticed this when it is hot, fluid looks clean and rosey, does any one has suggestion? pls advise
Re: 4L80E Transmission Problems louis pantaleo 5-4-09  
Hi den i am having the same problem just installed new trans and problem still there also changed harness wire still no luck it always get stuck into 2nd gear but no engine codes come on !!my mechnic is at his wits end can you help!!! thanks lou..
Re: 4L80E Transmission Problems Den 1-2-08  
PROBLEM
I found the problem with the 4L80E transmission staying in 2nd gear only in my 1997 GM pickup.

ANSWER
Removed trans. oil pan.As the shift solenoids require a ground signal to complete the circuit via the trans.ECM, I checked for a power supply (12V) to both solenoids and found none.The 10amp fuse for the trans. was OK.I then checked for continuity between the 12V supply wire (pink) and the end that plugs into solenoid with my meter...no conninuity. I then realized there must be an open in the circuit,and most likely at the firewall junction point.I was not going to spend all day disassembling that component.

Therefor,I cut the old dead (pink)12V supply wire and ran a new wire from the "E" pin of the 20 pin harness that plugs into the left side rear of trans. and routed it through the GM trans.split loom harness (very difficult)up and through the firewall to the factory 10 amp trans. fuse wire which I cut 1.5" away from the fuse box and soldered both ends.

The transmission now gets its 12volt power supply as it did before when the key is switched to the run position and the trans.ECM provides the ground signal for shifting each solenoid. Trans.now shifts perfectly once again.

Commentary
As a Lisenced mechanic I am once again disappointed with the quality of electrical workmanship in this vehicle.This truck belongs to my Dad,he bought it new and has only 35,000 miles on it in 10 years and always looks after it.
Re: 4L80E Transmission Problems Rick McCutchan 11-18-08  
Yep, had the exact same problem with about an 01 pickup at work. 2nd gear only, fiddle with the wiring and it would go away...for a day, a month, whatever, but would always come back. Finally traced it to the bulkhead connector. So every time it did it we'd take it apart, try cleaning though it always looked good, treak the terminals a little, think we would have it and it would work for a while. Finally got sick of it coming back every month or so and just pulled the 2 wires out and permanently connected them externally. Don't like doing things that way but we were fed up. It's the red or bright pink (as I remember) power wire to the thans. roughly in the center of the connector. When it would break the circuit the trans would just default to 2nd gear.
Re: 4L80E Transmission Problems JUSTIN 12-23-08  
I HAVE A 4L80E 4WHEEL DRIVE STARTS IN 1ST GETS STUCK IN 2ND SEEMS TO BE ONLY IN COLD SEASON THOUGH
Re: 4L80E Transmission Problems DENNIS 4-8-09  
DID YOU EVER FIND OUT THE PROBLEM AND WHAT DID YOU DO THANKS DENNIS
Re: 4L80E Transmission Problems Scott 4-26-09  
I have the same problem with my transmission that you were having, Dave. Did you receive an answer as to the solution?
Re: 4L80E Transmission Problems dave 7-15-08  
My 1995 gmc has a 4l80e trans also and it stuck in second gear.
there is a round plug on the drivers side of the transmission it controls the shift solenoids. all that was wrong with mine was a dirty connection at the plug it shifts fine now.
try this.
Re: 4L80E Transmission Problems Dan 4-10-09  
I have a 98 3500 van that only has forward gear. If in park..is still stuck in forward, only park pin holding it from going forward. Any ideas
Re: 4L80E Transmission Problems Tom 5-6-09  
Jay I am looking to buy a 4l80e from the same vehicle as yours with 2wd and 350 engine for my 1992 Chevy G30 van with 454 engine. Do you know if these are the same and did you solve your ECU shifting problem?
Re: 4L80E Transmission Problems Rob Chyko 1-7-10  
1991 c3500 with a 6.2 and a 4l80e shifts hard from 1st to 2nd and wont shift into 4th
Re: 4L80E Transmission Problems pat egan 4-2-10  
Is there an answer
Re: 4L80E Transmission Problems pat 4-2-10  
Bladerdefchung
Re: 4L80E Transmission Problems Haley 2-6-10  
Hi my name is Haley. My father has a 2003 chevy 2500 HD 6.0 liter silverado. he is having the sameproblems as John. It wont go into reverse but forward gears are fine... Just happened today while he was plowing the snow! He's a mechanic but he is puzzled. E-MAIL ASAP! WDavis7471@aol.com
Re: 4L80E Transmission Problems aap34798 3-25-12  
Your distributor is bad(sloppy). you may not think or feel it is because the engine may run smoothly but if you put it on a scanner it will show. do not get one from the junkyard! get a new one. this will give you back OD...you can unplug the drac module(vss buffer) by computer and it will reset for 1 or 2 shift sequences then lose OD or 4th gear again. now you know one reason things went to distributor-less ignitions. very common among 5.7/L480E combos including Isuzu box trucks NPR W4 4000, with gm power-train mentioned.
Re: 4L80E Transmsission Problem matt 11-16-11  
Hey there my name is matt i have a 1992 6.5 that had the same problem. and it was my computer which is located behind the glove box i highly recomend a change of that computer componet
Re: 4L80E Transmission Problems matt 2-21-10  
Trans stuck in second gear if u reset the computer some times it will shift great but as soon as u turn off the truck in start it again its stuck in lemp mode again
Re: 4L80E Transmission Problems jason bowers 5-22-10  
Replace the ignition switch your loosing voltage during cranking. I have fixed a lot of these.
Re: 4L80E Transmission Problems Mark 5-6-09  
Update: To defaulting to second gear.After careful checking and rechecking I came to find out that the problem was in the ignition hot feed.This feed supplies 12 volts to the 2 solinoids and TCC control.The feed runs from ignition key switch,to fuse, to bulkhead plugs then to pin E of the trans plug.A pink color wire.This was the problem I had before rebuilding trans.I ran a new hot wire to the trans from the key switch.I wired it in so that the wire would be hot with the key on and engine running.This is where I ran into problems.As I turn the key (on) then to (start) then to (run)I had no voltage in the cranking mode.In other words it would send 12 volts then 0 volts and back to 12 volts while starting the engine.This would react as a voltage loss to the trans,picked up by the computer and would go into a default mode to 2nd gear and spike the trans pressure.I hope this helps somebody else who's 4L80 Defaults to 2nd gear or limp mode
Re: 4L80E Transmission Problems tommy hays 7-8-09  
Ive got the same problem trans wont shift out of 2nd gear reads code 81
Re: 4L80E Transmission Problems r armstrong 4-15-10  
Reverse issue with 4l80e wont select revers when hot have to rev motor to get it to engage
Re: 4L80E Transmission Problems Doug 10-1-10  
1995 GMC K3500 has park rev.neut & 2nd only starts off in 2nd gear no matter where shifter is will coast if in 3rd or OD ANY HELP
Re: 4L80E Transmission Problems dylan laplant 8-10-11  
1995 chevy 3/4 ton 4l80e 6.5 diesel wont circulate fluid, just rebuilt everything in tranny, pump looked good so did torque converter any ideas on what the problem could be?
Re: 4L80E Transmission Problems red 3-7-12  
Im having the same problem with my 1993 3/4 ton 4x4 6.5 turbo diesel did u ever find the problem? Any help would b greatly appropriated.
Thank you
Red
Re: 4L80E Transmission Problems tony 9-13-11  
Same as jerry of 7/27/11 but have not rebult have change 2 siloniods
Re: 4L80E Transmission Problems Mike F 8-18-11  
Have a 2003 2500 HD w/4L80 tranny and it want go into reverse when it's cold. You may sit for 3 or 4 minutes before you can get it to go in. After it gets hot it works fine. All forward gears are fine. Fluid clean and level is good. Any ideas?
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