P0120

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9999 GM PRODUCTS GM PRODUCTS with 121000. miles

Since november 2008, my 2003 gmc yukon xl 2500 has had episodes where the service engine light comes on and the engine goes into reduced power mode. In this reduced power mode, the vehicle will reach a top speed of around 25mph. I have taken it to numerous gm dealers to fix the problem, and they have replaced the throttle body assemble and wiring harness multiple times and the problem keeps recurring. I have bought a scanner which i can erase the codes because it is very dangerous to be driving 65mph with semitrucks on your tail when you suddenly for no reason lose power and can't get over to the side of the road. There have been many close episodes where we were almost in an accident. After the throttle body was replaced in dec 08, the reduced engine power didn't come back until april 2009. Dealer then rewired the harness and it stopped until the fall of 2009. Since fall 2009, the service engine light and reduced power mode come on sporadically. In february 2010, the problem reappeared, but now the truck stalls when the engine light comes on and reduced engine power is enabled. This is very dangerous, as during the stall, all power steering and braking is lost. I have been driving down the road, turning, crossing traffic, and the light comes on and the truck stalls. This is very dangerous and scary. The truck has been in the gm dealership service dept for the last 3 weeks. Everytime they say it has to be the throttle body, they replace it, i bring it home and a couple days later we are back to reduced engine power with service engine lights. Trouble codes are P2135, P0120, P1515, and P0220. I have spent nearly $2000 on service that has not resolved this problem and they don't know how to fix it. I have read online many others have the same problem. This truck is dangerous to drive now that it stalls every time it goes into reduced engine power mode (which happens multiple times on every time i drive it).
ENGINE AND ENGINE COOLING, EQUIPMENT:ELECTRICAL

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2013 JEEP PATRIOT with 38150.0 miles

While traveling at 75 mph on cruise control on i-27 just south of amarillo tx, the engine of the 2013 Jeep Patriot shut off. I was able to make to the shoulder of the road without further incident and was able to avoid other cars on the highway. The car would not restart. Had to request that the car be towed to amarillo tx. Waited 3 hours for a tow truck at which time the car started. However, unsure if the incident would occur again, i had the car towed to amarillo. There a technician said that he discovered codes of P0120 and P2135. He said it appeared as if everything reset and that there was not an issue with the car. However, due to the nature of the incident, it could happen again at any time. *js
ELECTRONIC STABILITY CONTROL, ENGINE STEERING

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2006 GMC YUKON XL with 180000. miles

Codes P1516, P2135, and P0120 have returned for a third time. I was driving and my car went into reduced power mode. Luckily, i was just a mile away from home and limped my car home. I've since cleaned the mass air flow sensor and throttle body. I've changed out the tps and acceleration sensor. I've checked all my grounds and these codes keep coming back. I've noticed other people having this same issues which is why i did the steps listed above. I've taken it to a mechanic who said that i did every step they've would have done to troubleshoot this problem. Someone from gm needs to this issue, as i am not the only one that this is occurring to.
ELECTRONIC STABILITY CONTROL, ELECTRONIC STABILITY CONTROL

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2003 GMC YUKON DENALI with 152000. miles

I have a 2003 Yukon Denali i purchased and it has given me the reduced engine power light and almost had a few accidents on the highway because it drops the speed to 20 mph also it has the check engine codes as P0120 and P2135 i have been aware that gm has not found a solution to this and wanted to see if there is any recalls as i am very afraid of being in a very serious accident with my children in the car. The consumer stated the vehicle was repaired and requested withdraw the complaint. *js
ENGINE, ELECTRONIC STABILITY CONTROL VEHICLE SPEED CONTROL

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2003 GMC YUKON XL DENALI with 117900. miles

Driving 65 mph on the highway and all of a sudden my car loses power. This is very dangerous! The dash says reduced engine power. Engine light comes on. Codes for the problem P0120, P0171, P0174, P0300, P2135. I got everything done that was suggested the codes are gone and it's still happening!! Not sure what the Gmc dealership is up to but they don't have a clue to what's causing it or how to fix it!
VEHICLE SPEED CONTROL, ELECTRONIC STABILITY CONTROL ENGINE