I am getting a "Reduced Engine Power" display on my 03 Yukon 5.3L and I have read that there are several things that can cause this error. Need to find out have to nail down the right troubleshooting tool to fix it the first time around. Please help ASAP!!!
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Re: Reduced Engine Power error on display
Check your main wiring harness, This seems to be a pretty common problem with this vehicle. The main wiring harness is located in the engine compartment near the battery. Check the wires out very well. The other thing that you can check which would cause this is your battery and make sure that it does still have about 12 volts DC
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You can many times clear this error by disconnecting your battery for a few minutes...but it will not eliminate the problem it can remove the 'Reduced power' notice on your dash and improve performance briefly...best to get a scan and repair the problem...!!!!
I've had the reduced engine power mode happening intermittently below 40 degrees for the last year on my 2007 Yukon Denali XL. I do not wish to play the game of throwing parts at it by some incompetent repair shop so I've read and researched for many hours! I JUST MIGHT HAVE THE BEGINNINGS OF AN ANSWER. On one of the many forums, can't remember where, someone mentioned they felt like the butterfly was sticking on the throttle body in cold temps. He said, after warming up the engine, he would rev it several times to "loosen it". Sounded ridiculous but it has worked for me for the last 2 weeks. Now, I think the engine power reduced mode is the result of many different running issues but a lot of people complain about this during colder months. Here's a couple of my scenarios: I'm driving down the highway and I can feel it start to "miss" or faintly "cut-out" for several minutes. This is sort of a warning that shut down mode is coming. I pull over, put it in park or neutral and just rev the engine 4-6 times. Put it back in drive and get back on the road. I always make the rest of my 45 minute journey without incident. Scenario 2: it's cold outside and the check engine light comes on. Another warning sign for me that shut down mode is enivitable. I do the same procedure of pulling over, revving it 4-6 times and just go on with my travels. By doing this preemptive routine I have not had the shut down mode problem in the last 2 weeks except for one time when I had just left the house and it hadn't had sufficient warm up time to do the revving procedure yet. It seems to be a short-lived fix that doesn't last more than a couple of days but it has me feeling better about explaining to a mechanic, when I do finally take it in, as to what to look for and how I seem to fix the issue albeit temporarily. My next report will come when it is fully repaired by a "competent" shop. Hope this helps a few of you as its really a free test case diagnostic !
reduced engine power indicater is usually tripped by the ecu in response to other problems. the ecu puts everything in limp mode to allow you to move the vehicle without causing severe damage by overworking it. take it to autozone or advance and have the codes read (even if the check engine light is not on) repost with the codes and I or someone else can help you further.
I had the same problem with my 2003 denali and came to find out that it was the battery causing the problem. the battery with sufficient power will dictate the tps. if the battery is low or bad, it won't have enough juice to allow the tps to. work. get your battery checked.