GMC Sierra 4WD

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Engine light came on while driving and a message on dashboard said Service Transmission Now.Unable To Shift Soon. Took to dealer and they said it was the park position switch 1circuit high. Had to order part but not knowing how long to get it. Truck only has 12468 miles. Luckily I got it to the dealer ASAP. IF I were on the highway or a remote road, I feel that a serious accident would have happened. Having an electronic controlled console shifter not being able to get the truck to shift gears to slow down or stop is a real safety issue. Extended warranty does not cover anything like this. Please look into this. Thank you

GMC SIERRA 1500 2023 POWER TRAIN

The upper hood trim that sits above the grill, flew off on the interstate at approx 80 mph.  Upon research this is a common problem for this make and model in years of 22-24.  GM has a service bulletin for this issue as well as the NHTSA.  For this particular failure.  There was no warning and when I contacted GM they were unwilling to assist as "service bulletins" are not recalls and the vehicle is out of warranty.  There was no warning, no indicator, it just blew off and I had no idea until I got home and the piece was missing. I was unable to locate the part on the interstate, however I was able to keep all of the pieces attached to the vehicle for evidence and support.  I am beside myself anyone thought this was acceptable to sustain the force of air flow!

GMC SIERRA 1500 2023 UNKNOWN OR OTHER

Complete engine failure while driving on a highway. While cruise was set, the truck emitted a sound and sensation like we had run over something on the highway. Within a few minutes the engine started ticking. The cruise was disengaged which thru the truck into neutral. No dashboard sensors were illuminated. We were able to get off the highway but the truck would not restart. Truck was towed to nearest dealer who has confirmed engine failure.

GMC SIERRA 1500 2023 ENGINE

On XXX, I was towing my camper to Copper Center, Alaska from Palmer, Alaska when my truck experienced a full transmission shut down which put the truck into "Reduced Power Mode". We descending down the road right next to Victory Bible Camp (64741 Victory Rd, Sutton-Alpine, Ak 99674) when the exhaust break turned off and the truck decreased power and the Check Engine Light illuminated. The Diagnostic that was produced by OnStar revealed 3 different codes. ( P0700 TCM, P0747 Pressure Control Solenoid A is stuck in the "ON" position, C116b faulty brake pad wear sensor.) I called GMC of Palmer and GMC OnStar advisor, both informed me that the truck needed to be towed. My safety concerns is this.... I had minimum cell phone signal and not a gas station or service station within MILES. I was on the side of the Alaska Highway 1 which is a major thoroughfare for traffic going to and from [XXX]. Thankfully there were a few kind folks that pulled over to offer assistance. My truck is a 2023 GMC Sierra 2500hd with only 26,262 Miles on it. I purchased this vehicle XXX. (It Still has the Temporary Tags on it.) If had been in a different part of Alaska when this transmission failed to function properly then we could be talking about a life or death situation. Especially, if my child was with me. I was hauling my camper that weighed ATMOST, 7,000 pounds. This is less than 40% of the trucks ability. I feel that this could put someone into a dire situation had they not had the experience with emergency situations like I have had. (Prior Military Service). I have also filed a complaint with GMC Motors. Case# XXX.  INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

GMC SIERRA 2500 2023 POWER TRAIN

While traveling at highway speed during rush hour commute, the vehicle lost engine power and stalled. While coasting, I tried to restart the engine several times without success. Before coming to a stop, I attempted to get to the shoulder safely. Unfortunately, a portion of the vehicle was left partially in the lane and on the shoulder. Once I was completely stopped, I tried to put the electronic shift control into neutral so I could push the vehicle safely to the shoulder. The shifter would not allow me to shift into neutral and other override methods researched failed to work. I continued to try and restart the vehicle without success. I was in an unsafe position during rush hour commute for about 50 minutes until roadside assistance arrived and loaded and towed the vehicle. There was no warning of the issue prior to the incident. A code (P129F-Fuel Pump Driver Control Module Speed Signal Incorrect) was produced after the stall occurred via my GMC app. My vehicle was towed to my local dealership for service, but have not received the vehicle back at the time of reporting.

2023 GMC Sierra 2WD — vehicle data sourced from FuelEconomy.gov.

The 2023 GMC Sierra 2WD is a capable pickup truck designed for your hauling and towing needs. It features a turbocharged 2.7L engine delivering 310 horsepower and 395 lb-ft of torque, paired with an 8-speed automatic transmission for efficient power delivery.

	2020	2021	2022	2023	2024	2025	2026
Price	—	—	—	$37,600	$38,100–$75,000	—	—
Engine Capacity	5.3L	5.3L	5.3L	2.7 L	2.7L	5.3L	3L
Fuel Type	Regular	Regular	Regular	Regular	Regular	Regular	Diesel
Transmission	Automatic 8-spd	Automatic 8-spd	Automatic 10-spd	8 speed automatic	Automatic 8-spd	Automatic 10-spd	Automatic 10-spd
Body Type	Standard Pickup Trucks 2WD	Standard Pickup Trucks 2WD	Standard Pickup Trucks 2WD	Pickup Truck	Standard Pickup Trucks 2WD	Standard Pickup Trucks 2WD	Standard Pickup Trucks 2WD

GMC Sierra 2WD (2023) Specifications