Re: Service Traction/Service ESC/ENG PWR Reduced
Does this happen after a rain or a car washing? If so, there's a bulletin for possible water leaks on the left side of the car and it can affect a connector on the far left side of the dash. This would set code P2138. The codes you had are ones that generally don't fail and stay that way so finding their root cause isn't always easy. Like Greenman, I find it hard to believe P2135 and P2138 set at the same time. There's probably a wiring issue. It's not a big deal to fix, worse comes to worse, you ( the tech ) just restring the circuit. If the P2138 set, it's X206, a 22 way gray connector to look at for corrosion, if there's corrosion, there's a water leak that needs to be addressed. X206 is between the PCM and the accelerator pedal position sensor. The circuit between the throttle body and the PCM is a straight run, no connectors. I generally don't spend a whole lot of time trying to find an intermittent wiring issue. It's quicker and a more reliable fix to just restring the circuit terminal to terminal from where ever it starts to where ever it goes. Try to understand that at least an attempt was made to address the issue the first time you took it in. Sometimes, unfortunately this is how it goes. Throttle bodies, actually the throttle position sensors, have been an issue sometimes and are common to fail intermittently. I usually go that way myself when I get a P2135. If it comes back, I restring the circuits to the throttle body and that usually is the end of it. By the fact that there is a bulletin on the P2138 issue, GM HAS identified A possible cause for the code. Give the dealer a little bit of credit for what they've done so far, jumping down their throat won't help matters. As frustrating as it is for the customer to deal with the issue twice, most techs don't like it coming back either. A good deal of us take pride in our profession and do the best we can but we don't have crystal balls either.