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  1. Low Power Mode, Multiple Codes

    02-09 General Tech Q&A
    I have a 2005 GMC Envoy I6. The Low Power Mode Light is on and the truck just creeps along. Before that the A/C would go in and out. Got codes read. These are the codes. P0410 Secondary air injection system, P0420 catalyst system efficiency below threshold (bank 1), P0641 Sensor reference...
  2. Code P2138 Gas pedal works till car is put in gear

    Hi, I have a 2004 Envoy 4.2L. Starts right up, revs up no problem, soon as its put in gear, the SES and Reduced Engine Power light comes on and car does not rev anymore. I have seen threads on the Reduced Engine Power, but trying to pinpoint exactly if possible. Didn't read anything if the car...
  3. Need help with P2138 diagnostic trouble code!

    OEM Issues
    I have a 2004 Envoy with the infamous P2138 diagnostic trouble code (only; no other codes come up). I get Service Engine Soon (SES) and Reduced Engine Power (REP) annunciator lights, and it happens when the engine is cold. Most info I can find on this issue have led me to believe that...
  4. P2138, P2135, P0641 TPS Problems

    OEM Issues
    I just got three codes on my truck. P2138, P2135, and P0641. I believe they all correspond with the TPS. I have changed the throttle body because it has an integrated TPS. About 24 hrs later it popped the same codes. What can be causing this?
  5. Yep again @#$ SES and Reduced Engine Power - Code P2135

    OEM Issues
    I have read this and other forums on the P2135 issues. I had other codes too and following the helpfull posts of this Forum I have eliminated all but the P2315 and just in the last 2 days I am getting the Stabilitrac lights on also. I have sent my PCM out for reprograming, engine does run...