general problems of the 2003 GMC Yukon

The contact owns a 2003 GMC Yukon. The contact stated that while driving at various speed, the vehicle would stall as the battery warning light appeared on the instrument panel. The contact also stated that the vehicle would shake upon depression of the brake pedal without warning. The vehicle was taken to the independent where the vehicle was purchased and was offered no assistance. The dealer nor the manufacturer had yet to be notified of the failure. The vehicle had yet to be repaired. The failure mileage was approximately 200,000.

Reduced engine power mode on hwy at 70 mph.

There is an error message that displays on the dash for myself and thousands of others who own GMC/chevy trucks with these motors. They have a defective throttle position sensor with the truck where it says "reduced engine power". I've found 2 technical service bulletins that somewhat address the issue, but many people take their trucks to mechanics and dealerships to get the issue fixed and spend thousands of dollars in repairs and troubleshooting to get the issue resolved, to no avail. The 2 technical service bulletins that I found were #pip3089b (dated 10/31/2006) and #pip3042a (dated 8/30/2004). I've seen on many many forum posts about this issue and possible fixes, which when I read deeper into them, seem to not be true fixes.

The contact owns a 2003 GMC Yukon. While driving approximately 50 mph, the vehicle experienced independent deceleration and the reduced engine power warning indicator illuminated. The vehicle was previously taken to an independent mechanic who diagnosed that the fuel pump, spark plugs, transmission, and alternator needed to be replaced. The vehicle was repaired, but the failure recurred. The manufacturer was notified and transferred the contact to NHTSA. The failure mileage was approximately 100,000.

While sitting idle my vehicle suddenly went into reduced engine power mode. I was able to get over and pull off the road and shut off the car. 5 minutes later the car started like there was no problem. Over the next few days the rep warning would show up and my car would suddenly lose power. I was crossing the road during one incident. However, when I would shut off the car and restart the check engine light would go away as would the rep warning. After a quick review online it is easy to find hundreds of people who have a similar issue. Gm will only diagnose and if the light is off when you get there there is nothing for them to do except take your money and say good luck.

Vehicle has been serviced several times since first occurrence in September 2014. "reduced engine power" and service engine soon signals appear on vehicle panel causing engine power to be reduced in a matter of seconds. Has happened to me going 10mph, 55mph, and 70mph on highway, causing a near rear collision because I lost power so quickly. I have had it serviced 6 or 7 times since September 2014 and this issue is not getting resolved. Throttle body sensor replaced twice, throttle body harness replaced, all wires, and sensors have been cleaned and thoroughly inspected. Reduced engine power occurs weekly even after being serviced.

Intermittently at hwy and side road speeds, truck will shut down, check engine light comes on and extremely rough idle and loss of engine power occurs. Have followed all recommended fixes but problem persists. Engine code 1516, throttle position sensor out f range +- . 05 volts. Scary problem, as this occurs without warning and causes immediate loss of speed. Many many complaints posted on the internet of this same problem but no GMC recommended fixes or assistance. Refuse to take this to a dealer and let them poke around at $95 / hour and or to throw parts at truck in hopes of correcting. GMC needs to address this potentially fatal problem.

Vehicle powers down without any pattern, rhyme or reason. It will do it at 5 mph, and at 55 mph, when driven a lot, and when not. Reduced engine power light turns on, vehicle suddenly slows to 25 mph max, steering becomes hard, brakes too. Then will totally shut off immediately. I have replaced the battery, throttle body assembly and wiring harness twice. Fuses, fuel pump and filters, oil, and everything else as recommended. It put me in the ditch. It stranded me in the center of a freeway in winter. When it sits for a while, it resets, only to do it again. T/c light turns on also. I found out that I can manually reset the reduced engine power for a few moments (to get out of the center of the road) by turning the ignition switch on and off very fast. It is a extreme safety hazard! I haven't driven it in months due to absolute fear for my life. When its in reduced engine power mode, I can't get it to go above 25, and going up hills can't go above 5mph. If I am pulling a trailer, it starts to go backwards. This thing is going to kill someone! please help.

We were driving at highway speed and lost power with no warning. I coasted to the side of the highway avoiding one collision. I had it towed back to home. The dealer had to clean the throttle body. I contacted gm and asked where was this cleaning for preventive maintenance. They could not answer. I am fearful for others who have this type of vehicle. Without cleaning the throttle body others will have this problem too. I went to several internet forums and many others have stated this problem. . Read more...

Reduced engine speed warning light comes on and drops truck to an idle. I feel this is very dangerous in traffic and on highways. My mechanic has not been able to locate problem. All forums and online help has brought me to dead ends. This is my last resort, I believe gm knows what the problem is and am hoping they will do the right thing and recall before someone is seriously hurt or killed from this issue.