I received this code 3 times earlier in the week along with the reduced power message. Thought it was a defective accelerator pedal position sensor. I think the problem was a bad tank of gas.

 

Codes were P1125C, P1286C and C1278C.

 

Im having the same issue as well as a reduced power as well did you have any luck clearing the codes

 

My problem was bad gas. Put Sea Foam in tank and problem has never happened again.

 

Question:

Did you do any modifications at all to your Vette?

Usually "Bad Gas" will not be the cause, it will be something else hence the P1125, P1287 code and the C1287 - which will trigger the Reduced Engine Power

Keep an eye on both of those the Accelerator Pedal Position Sensor and the Steering Wheel Position Sensor if you keep getting the problem then you will need to look into the connections first and make sure there is not corrosion and go from there etc.

Thanks,Matt

 

First off apologies for the 10 year old necro-thread but this post got me back on the road after I had to park up the Vette for a while. So first off, thank you for keeping fuel on the white board!

My instinct before running codes was bad gas and I let the DT Codes send me barking up the wrong tree(s). I pulled the TPS, it was working fine. I pulled the pedal (could not make sense of the electrics without piercing the insulation)... and when I put it back on it was passing checks on the scanner I bought...So I cleared the codes and everything came back to life... until I let the car run and then when I turned it back on the PPS was throwing codes again. So, out of frustration I hotwired the fuel pump and pulled 4 gallons of **** out of the rail, filled the tank back up with a large helping of Techron and 93, cleared the codes again and she was ripping down the road smooth as butter. Thought you should know that you were not crazy and that in fact you came through where two forums, a mechanic AI, several auto parts store lackies, an overpriced scan tool app and all of my car buddies. I was about ready to call my tuner and a flat bed.

Bolt-Ons. Intake, Headers, AIR system delete, tune.

I also accidentally reversed with the Ebrake on coming down off my ramps after replacing my starter which triggered a TC fault (the first red herring that had me worried about the TC computer the whole time) when I turned the car on after washing it (which had me worried about wire damage, water damage) to pull it back into the garage (could not even limp it back in, had to push).

I think what happened is that the fuel was not good enough to run my 93 tune but also just good enough to run the car at idle? The computer sees this as a failure of comms between the TPS and the PPS and starts throwing codes.

 

Moved to C5 Tech.

 

...and never-mind, it's just intermittent, I have more power in limp mode now but she really wants to be there. I think I'm going to just purchase an APPS but after a successful clear it doesn't seem to trigger until I jostle the car? maybe mice got into the wire or something is loose/bad ground... I have a backprobe kit coming tomorrow.

 

I thought it was fixed with new gas ??

 

Me too. It drove a couple miles like the day I bought it. I got my dopamine fix for a moment from solving the mystery and now I'm back to frustrated. No time for it tonight but tomorrow I have a bench supply coming to test the APPS... but I think it's a TAC overheat due to bad ground or water based on the additiinal code and the timing of the code throws... if the APPS passes tomorrow I will take the wheel off...


It did need the gas though. At least now I can move in limp mode.

 

Good luck brother.

 

I think I found the problem, lol. Pulled the battery shelf to check the ground and found a whole mouse nest up against the ECU. They chewed through the TAC harness sensor 3 ground going to the PPS. Opened up the wheel well to pull the cable and found a corpse (and sucked a few more up with the shop vac).


PPS Sensor 3 line (dark green)

Will have to fix this tonight/tomorrow and update.