Re: 2001 GMC YUKON REDUCE ENGINE POWER ON MESSAGE BOARD
The following is a post from another site. I had the same problem and this worked for me.
I just wanted to share with everyone with the problem that I had withmy 2003 1500HD Crew Cab with 6.0 Liter. My truck would go into reducedengine power off and on. Sometimes one a week, sometimes 5 times on a20 mile trip. My problem was a broken wire on the plug in going in tothe throttle body. In the picture is the plug in that had caused me allof my pain and grief....... My problem was very intermittent and washard to diagnose. I started vehicle and with all codes clear. I wiggledthe wiring harness in the picture and vehicle spit and sputtered,throwing it into reduced engine power mode, and then smoothed out to asmooth idle. I disconnected the plug and pulled wires out of plug endand found a broken wire. Mine was a brown wire with white stripe. BUT,what was interesting, was that this vehicle had apparently had the smaeproblem with previous owner, becuz there was another wire (yellow wire)right beside the one that I found broken already soldered up and tapedfrom where it had apparently happened before. This was my problem andnot my truck is running great, and actually even idles better thatbefore. Hope this helps with any problems that anyone else is having. Iknow this problem can be very irritating.
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A sensor within the car's computer system has detected a possibly major problem. The system then puts the engine into "limp mode" so that it can be driven to a repair station. Driving in this condition will only increase the damage. Highly recommend you take to reputable mechanic immediately for computer diagnostic.
I had the same problem in my Yukon Denali And after 4 throttle body's, replacing gas pedal, rewiring the grounds replacing sensors, took it to not one but two GMC dealerships who were useless they can't fix their own trucks they're not the brightest !!!! After thousands of dollars I found a mechanic very familiar with this issue you want the solution it will cost ya 500$ for me to tell ya!! Just kidding I know how frustrating this problem is okay here is the fix the problem is these electric throttle bodies are GARBAGE!!!!!!! Don't matter what u do or what u replace it will come back on unless u convert your electric throttle body to the old cable throttle the actual fix was 900$ but I spent thousands and thousands trying to fix it!!! Please save your money and tell ur mechanic u want to convert to the old cable throttle!!! Gmc is well aware of the problem but won't fix it for u cuz they're useless
there are 2 conditions that will trigger this SAFE MODE that the engine is running in. The first is transmission over temperature when the sensor in the transmission senses over-temp situation it reduces engine output to no more than 1500 rpm. The second is low oil level in the engine, which will also limit engine rpm to 1500. One of those sensors is bad or the wiring for one of them is damaged. This SAFE MODE is designed to protect the engine or transmission from further damage.
need to have vehicle scanned the trouble codes will be stored in the computer most auto stores offer thi service for free check ur local area there are a few hundred different codes or problems that can cause ur problems and being interment can also be an electrical connection/harness problem
Reduced power mode is when the
electronic ignition is strategically is not firing all the cylinders to prevent
catastrophic failure of your engine. The reason for the GM Engineers put the reduced
power mode in the vehicle is so you can drive the vehicle under 50Mph for about
50 miles to a mechanic before the vehicle completely dies.
There is something going on with the electrical system. I think it would be best to take it into a shop and pay $30 for an OBD2 diagnostics. There are far to many things that could be causing it and to replace them one by one could end up costing thousands of dollars. Best to have the diagnostic computer tell you what the problem is.