2017 GMC Sierra 1500: sudden loss of power

Filed Apr 19, 2026 · Engine · CT

I drive this vehicle on higher speed roads to work everyday. Roads also used by large tractor trailers and like larger vehicles. I was told by dealer that I had broken exhaust manifold studs at a previous oil change. While driving the truck it seemed to lose power for a short time but I was in traffic and assumed the loss of power at that time was related to a possible exhaust leak.I scheduled a appointment to have the repairs addressed. When I picked up the vehicle I was told that there was a ticking noise in the top of the motor. They stated it was the lifters and needed to be repaired for $7136 dollars. I researched the problem and found out how big of an issue this is specifically for the owners of the 6.2l (L86) engine. Highly concerned I schedule the repair and dropped the vehicle off. Shortly after the dealer called and stated the vehicle had bent push rod collapsed lifters damage to the cylinder head, camshaft and worn camshaft bearings now cost are $14350 or replace engine for $17000. I chose to replace top end. The next day I was called back and was told the bearing on the cam journals were down to brass and I would need new engine. Cost in just 24 hours not are $22000. This vehicle was maintained by this dealer also for all fluid changes. The belief is all the failures were related to the active fuel management system. (going from 8 to 4 cylinders ).

Filed Aug 11, 2025 · Transmission · WA

Driving on highway at 70mph loss of power. Transmision slipping and vehicle rapidly lost speed creating a very hazardous situation. Was able to barley get of highway safely going down to 40mph. Vehicle went into limp mode.

Filed Apr 18, 2025 · Acceleration, Electrical · TX

Total loss of power while in motion on highway going 70 when first happened, got video of problem for shop while going lower speeds. Truck will loose all power the dash will turn off and then turn back on sometimes the engine will cut out completely.

Filed Nov 1, 2024 · Brakes · LA

The affected vehicle is a 2017 gmc sierra 1500 4x4 crew cab truck with less than 34k miles. While driving the vehicle today the brakes became very hard, like a loss of power brakes. Felt like there was a loss of vacumn. At slow speed in reverse the brakes "shuddered" when applied. Have not taken it to a dealer as it just happened while traveling. Cheched for information for symptoms online and found gm had initiated a recall for this issue so I checked the nhts web site to see it my vehicle had a recall. System indicated 0 unrepaired recalls for my vehicle. So wanted to report the issue.

Filed Oct 16, 2024 · Steering · 150,000 miles · FL

The contact owns a 2017 GMC Sierra 1500. The contact stated while driving at 70 MPH, the vehicle lost power steering functionality. The message "Power Steering Failure" was displayed. The contact continued driving until he could safely pull over to the side of the road. The contact stated that he was able to pull to the side of the road by using physical force to steer the steering wheel. The contact then drove to the residence at low speed. The dealer was notified of the failure and informed the contact the vehicle was not covered. The vehicle was not diagnosed or repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 150,000.

Filed May 10, 2024 · Engine, Transmission · OH

#1 While merging onto the highway, the vehicle began to shake violently and have a sudden lose of power due to a misfire on cylinder 6 and 4. I was unable to merge onto the highway as the vehicle would not accelerate almost causing me to be hit from behind. I was able to get the vehicle off to the shoulder to avoid an accident as it was barely able to stay running and the CEL was flashing. The failed parts (AFM lifters/push rods and VLOM) have been removed from the engine and saved for review. #2 My family's safety was put at risk as the vehicle had a sudden lose of acceleration while trying to merge on the highway almost causing us to be hit from behind. #3 I spoke with my local GMC dealer and explained the situation and diagnosis that I have completed on the vehicle. That wanted me to pay out of pocket to tow the vehicle in and would not cover anything as the vehicle is barley out of powertrain warranty (72695 miles). I have been an engineer in the automotive industry for almost 10 years and can properly diagnose a vehicle and the issue it has. Trouble codes were provided along with pictures and videos as evidence. I understand when something is a safety issue and needs to be addressed as this is a common issue with GM 5.3l and 6.2l engines. I then spoke to GM corporate (Mandy, case# 9-12424996557) and once again they wanted me to pay for everything out of pocket even though this is clearly a safety concern with their product and the diagnosis had already been completed. This vehicle has all the maintenance records since it rolled off the showroom floor, proving that the failure is not related to neglect or poor maintenance of the vehicle. There is very clearly a design issue or manufacturing issue on this components. #4 Components are available for inspection by mfg. #5 There were not warning lights or any other indicators prior to the failure. Oil pressure was at 40PSI and engine temp was ~200F. All within the normal operating windows of the vehicle.

Filed Nov 11, 2023 · Engine · ME

I took my 2017 GMC Sierra 1500 SLE in to my local dealer because the engine was misfiring and there was a loud ticking noise coming from the engine. There was a sudden onset of loss of power, sluggish acceleration and shuttering. The dealership technicians did their diagnostics and found "cyl 1 miss fire removed valve cover and rocker arm found cyl 1 intake push rod bent replaced cyl 1 rocker arm push rods and all driver side lifters re[placed v loam resealed all 8 injectors cleared code miss fire is cured." This is a known GM issue as pursuant to service bulletin 15-06-01-002L. Upon further research from other complaints it was reveled to be caused by KNOWN defective or sub-par components being continually installed in GM vehicles. GM has knowledge of this issue and should take ownership of their shawty and deceptive work practices.

Filed Sep 26, 2023 · Transmission · MI

Truck all a sudden developed a Lifter noise under the hood and the check engine light came on Friday, September 8th. I checked the oil and oil pressure which was ok. Saturday morning 9/9 I notice some loss of power pulling out on Highway. I took the truck immediately to a friend who is a retired GM Master Mechanic. He coded P0300 and P0306 with 158 miss fires. The following Monday on September 11th I took the truck to Clift GMC in Adrian, MI. They confirmed a Lifter failure and bent Push Rod on Cylinder six. on my 5.3L engine. Since I have learned the AFM System on these engines is driving Lifter Failures. I was lucky my Camshaft was not harmed. My truck had 84,945 miles on it and is six years old. GM offered no, zero assistance. The Dealer could only state this is a well known issue which they see frequently offer a extended Power Train Warranty at a cost of $1600 t $2000 dollars. How is a Extended Warranty a solution to a poor Engine Design? Help!

Filed Sep 5, 2023 · Engine · MD

At 48k miles with all service maintenance performed by GM dealer I experienced a ticking noise and loss of engine power. The vehicle was taken to dealership and I was told it was a lifter problem with no explanation of how or why this has happened. I was without a vehicle for 3 weeks. I picked up the vehicle and was told the vehicle was repaired only to still find the vehicle had hesitation while driving and still had a ticking noise in the engine. I returned the vehicle and am now told the engine needs to be replaced. I was also told that I am responsible for the cost of repairs. I found a class action has been filed against GM for this issue. I have been told that GM does not have a recall issued yet I was told at the dealership they have seen this happen and GM has a Service Technician report on how to fix this issue. At this time my vehicle is sitting at the dealership awaiting a response from GM to see if they will take any responsibility. My truck has been at the dealership since August 7, 2023. I have paid almost $2k and was told I would owe an additional $9300. to replace the engine. I do not have paperwork from the dealership to show service work performed. The dealership has not closed out my ticket however I have paid almost $2k for work performed. The dealership said that they matched the cost I have spent but I have no record of their costs.

Filed Feb 26, 2023 · Engine · CT

Misfire with code PO300, Ticketing from engine at higher RPM/lose power and seems to be misfiring. Check engine light would blink and then shut off. Four rockers found to be bent push rod. - Replaced right and left side lifters and guides. Replaced Vlom and 1 push rod. Dealer diagnose and repair. Lifter failure due to engine switching from V8 to V4. Very expensive and very common problem with this type of engine. Truck is young with only 74,000 miles on it. Had to replace the transmission at 70,000 also.

Filed Jun 29, 2022 · Brakes · AL

Loss of power assist at slow speed when backing or going forward. This has happened several times since I have had the vehicle. Brake pedal is very hard to press and vibrates.

Filed Jul 19, 2020 · Steering · 27,000 miles · OR

Was pulling my trailer out of the water and lost all power steering, fluids full, pump working, just electrical issue. Had to drive home 20 miles without power steering, very hard to turn. They said they 'fixed' this is issue in 2015, but here I am in a 2017 with the same problem, low speed and completely lost power steering, thank goodness I wasn't pulling on to a highway or in the middle of a curve.