Reduced Engine Power Sensor

[sBoddie]

Not as bad as it sounds, for a qualified place. $800 and I was out. Spent 3 times that trying to find out that was it. I guess just age and engine heat gets to the plastic eventually.

[blue03xlt]

03 Envoy 170K no modifications.

In May 2012 Reduced Engine Power light/Check Engine light started coming on randomly - it happens in hot and cold weather, local and highway driving, short and long distance. Lose ability to accelerate, have to restart engine.

Since then over 1/2 dozen visits, local independent shop has replaced throttle body, accelerator pedal/sensor, wiring harness/connectors, ECM. Tech assures me problem has stopped (test driving vehicle 300+ miles total) - and within a day of getting it back, problem recurs.

Apparently, they're test-driving it with panels off because twice when I stopped by to pick it up, they mentioned having to put the panels back on. So I'm wondering if it's possible that when they're replaced, they're crimping some wiring? Does this sound possible, and if so, what should I look for?

Same shop replaced Fan clutch June '11 (not sure if relevant, but others have mentioned it)

Before this, these guys treated me right, but I've spent over $1,000 so far, and I've lost confidence in them. When I do find a new shop, I want to be informed - what should I be expecting?

Thanks in advance - lots of good information here, looking for guidance as I pursue this. I love the vehicle and think it can keep going a while.

[littlelav]

Hello guys, I am new here as well as a DYI guy. I dont know a whole lot about vehicals but enough to get me buy and save$. I am having this same problem, the Reduced engine power warning displays and wont go away. I have checked the wires at the TB as well as the pedal, cleaned my TB, cleaned and sanded my ground conections, the ones i could find anways. Disconected my battery. Hooked up a wire from the neg post of battery to the TB. Everything i have done isnt fixing the problem. Am i missing something, or do I have to replace my TB. Is there a way to check if the TB is working properly. Please any help would be much appreciated. It is a 2003 GMCsierra 1500 HD

[blue03xlt]

As others have said elsewhere, if a fix isn't working try replacing an aftermarket part with an OEM part before going onto the next thing. Wish I had known sooner because it would have saved me 6 months and over $1,000 - to say nothing of the aggravation!

[LKA]

Have the issue with the reduced engine power light says code 107 on the obd ive replaced the map sensor already and cleaned the throttle body to no result when i start the car its not on after about 10 sec it comes on and runs rough cant figure it out either