[Phixion]

Hello Eric and welcome to Swedespeed! I have a 2004 2.5T FWD myself and over the past several years gotten a random P2127 code that'll pop up and basically makes my accelerator inoperable, won't rev the car or anything. Generally turning off the car, cleaning the code and starting back up will make it like nothing ever happened. Usually this issue rears its head when I'm stopped at a light, then it turns green and I hit the had and nothing! Just the slow creep you get when it's in gear and no throttle input. It's happened once while on the freeway going 70 mph when I let off the throttle momentarily since years ago. Have yet to replace anything or figure out why it's happening.

In any event, I'm assuming you've already tried clearing/erasing the codes and that doesn't help. Next question, how's your battery? Sometimes a bad or low battery (low battery health, not low charge) can cause wonky electrical issues. If your battery is good, try the electrical reset procedure. Remove both battery cables from the battery, hold them together for at least 15 minutes to help discharge any transient electricity in the car. Then reconnect them to the battery and see if things go back to normal. This process has solved many owners lingering electric issues.

Next I'd check fuses. There's multiple fuse trays, one under the hood, one in the side of the dash on the driver's side, one at the CEM module under the dash and then one in the trunk at the REM module on the driver's side behind the panel that folds down. I unfortunately don't have all the fuse designations on me at the moment, but perhaps @volvogod who's affluent in the electrical system among other aspects of our cars might know exactly what fuses to check. Other than that, I'm not sure what else to check. I think if I recall I've heard of the wire loom that runs from the throttle body connector back to the ECU can sometimes go bad, but I'm not sure of the symptoms of that.

 

[Phixion]

You're welcome! In your case since resetting the codes it'll immediately return, that to me indicates a definite issue and not a fluke like I experience with my P2127 code which is very random and intermittent. That's good your battery is strong, we can rule that out then.

 

[Phixion]

If it keeps blowing, there's something wrong with the A/C clutch and/or compressor unit or perhaps a relay to the system. But at least you do know the cause of the accelerator issue.

 

[Phixion]

This is great to hear that you got your car drivable again until you can resolve the A/C issue.