2005 GMC Sierra: check engine light

Filed Oct 15, 2015 · Fuel system, Transmission · 78,480 miles · NY

Issues with emissions switch. Check engine light will not go off. Also 3 and 4th gear are completely gone out. I do not tow or have had anything even remotely heavy in this truck. It's a 2005 gmc sierra with only 78,480 miles on it. I am not the only one having issues with this 4 speed transmission. It is not heavy duty enough for this size truck. Gm needs to recall all of these transmissions. When it first started slipping I lost all power going down the road at about 55mph. The vehicle that was behind me slammed on his brakes to avoid hitting me. This problem with the transmission is going to kill someone.

Filed Aug 12, 2015 · Engine · 270,000 miles · KY

Tl* the contact owns a 2005 gmc sierra. While driving at approximately 60 MPH, the engine suddenly increased in speed to approximately 10 MPH. The contact stated that the display panel read "reduced power mode" and the check engine warning light illuminated. The vehicle was restarted, but the failure recurred multiple times. The vehicle was driven to an independent mechanic where it was diagnosed that the throttle body needed to be replaced. The vehicle was repaired; however, the failure recurred without warning. The vehicle was then taken to a dealer where the throttle body wire harness, the throttle accelerator control module, and the accelerator pedal assembly were repaired. The repair failed to remedy the failure. The failure mileage was approximately 270,000.

Filed May 28, 2014 · Airbags, Electrical · 53,000 miles · KS

Within 4 months of purchase, was driving at approx. 25 MPH when transfer case shifted into 4 high on it's own. Shut off vehicle, restart and able to put back into 2 wheel drive. Happened on and off for a little more than a month when it went to 4 lo while driving at 30 MPH through town. Unable to reset. Limped it the 2 miles to dealership for diagnosis. Cost me $1200 to have the transfer case rebuilt. Smoked the clutch pack, burned out 2 bushings and bent shift shaft. Had second issue of shifting on it's own, may 15th, 2014. This time it cost me $500 for the shift motor to be replaced. Second problem, speedometer reading incorrectly or not at all. Been going on for about 3 years sporadically (apparently the little drive "motor" on the back of the instrument cluster, $300 replacement or, found a company to rebuild with new "motors" for under $200). Passlock issues started in jan 2014, has left me stranded a couple times now. Can't get a good answer from dealer as to how to repair other than "bring it in and we'll hook it to our diagnostic system" (I.e. Pay us lots of money). Also having issue with check engine light on constantly. Intermittent engine miss on multiple cylinders. Rough idle, crappy mileage, but not down on power. Miss seams to go away off idle and not noticeable under load. New plugs, wires, etc, etc, etc.... Haven't figured this one out yet. Same answer from dealer (pay us more money please). Lastly, air bag light came on in dec of 2012. Never crashed or bumped but had to replace left front air bag sensor. Love the truck, currently has 154000 miles but I'm getting frustrated with all the little electrical "glitches" and the dealer won't help a bit without the normal answer, "bring it in and we'll hook it to our diagnostic system". It's dang near $200 (diagnostic charge) just to get my truck in and out without even getting anything repaired!

Filed May 24, 2014 · Engine · 59,640 miles · LA

Crank vehicle turn corner , message engine power reduced, check engine light appeared, turn around return 200 feet to home, check all fluids connections turn off ignition, unable to start engine, let sit, unable to start engine, drive wife to work other vehicle, recheck all fluids connections, refill coolant, crank engine, coolant discharge on overflow line on cold engine, kill engine would not start, go to autozone get extra coolant and new gas cap. Return coolant level ok. Install new gas cap, engine hard to crank like vapor lock or no fuel to engine. Crank engine, let run, kill engine. Unable to crank, return to work, return in 3 hours, reinstall old gas cap, check fluid levels, ok. Crank engine let run for 5 minutes, check engine light still on, wait one hour, crank engine back to normal check engine light off, engine run ok, drive short test drive. Unable to operate vehicle safely for 6-8 hour period, unsure if vapor lock, bad fuel, fuel filter, bad plugs, coil on plugs, loose plug wire, etc. Never had any engine problems in the past. Only instrument panel cluster failure, and steering click knock that was fixed by dealer. Research problem on internet, it appears this is a throttle position sensor failure that gmc has identified as a safety problem and made a special extended coverage for 2008 to current year vehicles or ten years or 120000 miles. Fromresearch on computer, it appears tens of thousands of comments regarding this loss of power and engine stop. I am older man and reacted with caution and was near my home. Had I been on a busy street or highway a crash or injury would most certainly occurred with this disabled vehicle the cause. I had never imagined this would happen to me nor had I heard of it from any media source or dealer memos. I am hesitant to drive any distance or on certain high traffic roads due to this problem recurring.

Filed Nov 9, 2010 · Engine · 110,000 miles · NC

Tl*the contact owns a 2005 gmc sierra. The contact stated that the check engine light illuminated. The dealer stated that the failure was within the evaporation system and that the evaporation vent and filter needed to be changed. The failure mileage was approximately 110,000 and the current mileage was approximately 120,000.