Loss of power without warning , while on highway. From 65mph to 0 without warning. Almost caused a crash pile up....was almost rear ended. Very dangerous...whole family children and all was in the vehicle.
GMC Yukon Denali loss of power problems
28 of the 898 owner complaints about the GMC Yukon Denali describe sudden loss of power, most of them for the 2003 model year.
- owner complaints
- 28
- worst model year
- 2003
- typical mileage
- 126,000
Is there a fix? No recall or service bulletin covers this area of the car yet.
By model year
Often reported together
Trouble codes mentioned
P2135 1P0120 1
What owners say
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.
I was on the highway driving through boston in the fast lane, going about 70mph when all of a sudden the stability control light came on with the check engine light and the engine reduced power light and my vehicle totally lost power to the gas pedal. I was able to get into the slow lane but my vehicle was not able to go faster than 35mph and there was hardly power to my gas pedal. Luckily, I made it to an off ramp, as I started to come to a stop, the engine was running very rough and it felt like it was shaking the vehicle back and forth. I barely made it into a empty parking lot and shut the engine off. I managed to make it to my mechanic, who got a throttle sensor code from the engine. He told me about a special coverage adjustment #12273b from gmc, regarding this exact issue and told me to take it to gmc. Gmc told me, my vehicle isn't listed for this adjustment, even though, it says it should cover 2008-20111 gmc yukons. Apparently, gmc said my VIN isn't listed as having the faulty part. I almost died this morning in the fast lane in boston with the exact problem gmc describes in the 12273b. Gmc said I'm not covered and have to pay out of pocket. Absurd.
Tl* the contact owns a 2012 gmc yukon denali. While attempting to accelerate from a stop, the vehicle began to hesitate and lose power, but the engine continued to rev. The failure occurred randomly without warning. The vehicle was at the dealer for diagnostic testing. The manufacturer was not notified of the failure. The VIN was unknown. The failure mileage was approximately 33,000. Updated 05/11/16*lj
Driving vehicle at 30 MPH. Lost all power and engine. No brakes, no power steering, no dash lights, engine quit running, no exterior lights. Parked vehicle in parking lot. No power at all. After about 20 minutes of waiting vehicle started again and had minimal acceleration/power.
While driving my vehicle lost power slid on brakes, air bag light and stability light came on and stayed on.
As I slowed exiting a freeway about 35 MPH, I heard a screech & a bit of loss of power. When I attempted to put into reverse for parking (later) it was apparent it was the transmission. As I investigated on line it was an ongoing transmission problem due to "less than robust parts" inside the transmission. Gm dealer-service rep. John at zubor agreed with this and told me to contact gm since it was, just over the 100,000 mile powertrain warranty. It took gm two weeks or more to reply & return my calls & emails, when of course I was told a gm dealer must diagnose the problem--vehicle was already repaired at that point by my own mechanic. I do not have another form of transportation & since it is out of warranty I had no promise of gm assistance, I took it where I could! I paid $1850.00 for a new trans with warranty. I would not be writing except this is an ongoing problem & the gm tech on line said there was "nothing you could do to prevent this from happening since the interior parts are weak". Gm tech commented gm had began using more "robust parts for replacement, but due to high labor costs (interior parts) he suggested to replace trans so you would have a warranty". This is also what our mechanic advised. Please advise.
Car alternator failure affecting driveability. Loss of power, steering, brake, door locking system, engine shut off. Car needed to be towed and the cost of repair was $ 550.05 diagnose was replace alternator and belt.
Tl* the contact owns a 2003 gmc yukon denali. The contact stated that the vehicle decelerated and stalled. The reduced engine power indicator illuminated. The vehicle was taken to the dealer six times to repair the throttle body, pedal switch, and wiring harness, but the failure recurred. The failure mileage was 220,000. Updated 10/02/14*lj updated 3/9/2015
I was driving north on 85 at 70 miles an hour and my vehicle decided to drop down to 20. I have looked up information on issues this truck has had and 1 of them is registered under the federal safety agency id # 100032435 / pip-4695.gm: loss of power hesitates on acceleration. 4.3, 4.8, 5.3, 5.7 and 6.0 engines coupled with the 4l60e or 4l65e may experience a condition of hesitates, misses or loss of power under acceleration. The vehicle may operate as if it is in reduced power mode. *pe I have purchased an air mass flow sensor, throttle body sensor, all 4 o2 sensors, and a coolant sensor. My truck is still not running at full capacity. I need some information on this and some help fixing my vehicle.
Related recalls
No recalls on record for this model year.
Questions about the GMC Yukon Denali loss of power
Which GMC Yukon Denali years have sudden loss of power problems?
The model years with the most reports are 2003 (10 complaints), 2004 (5 complaints) and 2007 (5 complaints).
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