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  1. 02-09 General Tech Q&A
    hello all. i have a 4.2 04 with 143600 on the clock. ive been having an issue where using large power draw such as windows or using heat on full blast or anything that highly draws power very suddenly will cause reduced engine power with code p2138 "Throttle/Pedal Position Sensor/Switch D/E...
  2. 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...
  3. Introductions
    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...
  4. 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...
  5. 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?
  6. 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...
1-6 of 6 Results