Leaving to go to work this morning, I went to turn off TCS and the car stalled and low engine power came on, I tried again it stalled again. I checked the codes and this is what I came up with...

P1518 PCM to TAC Module Serial Data Circuit -

C1255 EBTCM Internal malfunction

C1278 TCS Temporarily Inhibited by PCM

B2721 PASS-Key Detection Circuit

C2115 Left Rear TPM Sensor Malfunction(I know what this one is)

Any help would be greatly appricated...

Thanks,
Jason

 

Man thats a new one for me too. It sounds like it may have soemthign to do with your Keypass system. Reset or clear your codes and try it again. Wierd I gotta see how this turns out good luck.

 

Look at the other post on here titled "weird problem" and read my response. This is of the same nature

 

I don't have my troubleshooting books here at work with me,maybe try to clean the pellet on the key,try the spare key,or disconnect the battery and try again.Also take a volt meter to the battery,anything less than 12v is probably not good.C5s do weird things when the battery is low.

The TAC is the motor on the throttle body (driver side) the controls the throttle blade movments.The TAC module is located by the PCM.Sounds like the accelerator pedal lost com with the TAC at the throttle body (remember it's fly-by-wire)Make sure your battery isn't leaking acid down the wiring harness to the computer.Very common on early c5s..