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Diesel with 4l80e tranny phillip 12-5-08  
I have a 4l80e in my 93 gmc 3/4 ton 4x4. great truck.BUT. i have no reverse or overdrive. i parked it one day. went to go to work when nothing happened. i have 1 2 3 but no overdrive. cant back up. but everything else pulls great. just pulled a loaded trailor today. acted like i had overdrive off. checked the servo piston above filter. it was fine. changed filter just to doit. miles. you sittin down. 375000. any help would appreciated.
Re: diesel with 4l80e tranny brent klein 12-15-08  
Hey there, I have the same problem with my 94 h! hummer, have you came up with any solution yet.....?
Re: diesel with 4l80e tranny Dieseljoe 1-22-09  
In these trucks, the pcm or power train control module controls the engine via the injection pump and the transmission.

In several trucks, I have seen road or trail debris whack the connector on the driver side of the trans. Check for bent or pushed pins in the connector and carefully re-seat the connector.

In rare instances, it may be a PCM failure, but these typically only occur if you have tampered with the PCM will come back by re-flashing it with the original code if this is the case. The 95 and later pcm's do not have a replaceable ROM, so this should not be a problem.

Check out alldata for a good technical resource on both trucks
Re: diesel with 4l80e tranny Mitch 3-7-09  
Change out you tps. code 22.I had same problem. Changed the tps(throttle positiong sensor, reset code and it was perfect.
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