2017 GMC Sierra 1500 Engine

My L86 Engine had 250,000 plus miles and the engine went out. So we decided to rebuild the engine due to the truck being paid off and the cost of a new engine is much cheaper than a new truck. After the first rebuild the engine last around 10K miles. We pulled the engine back apart to find out that the crank bearings were shot along with the brand new GM crank that was purchased. After doing research, there was no enough clearance between the GM bearings and the GM crank. Basically the same issue that the L87 is having. After doing more research it determined by the part number on the crank and the part number GM provides on their website that the L86 and the L87 (engine with current recall) take the same crank. Therefore my L86 due to GM only making the L87 crank now and it replaces the original L86 crank we had to replace the engine a second time. I believe this relevant to all the L87 issues and any L86s that are being rebuilt. We ended up having to purchase aftermarket crank bearings to get the correct clearance on the second new GM Crank that was purchased. Truck is now running good now.

6.2L lifter failure camshaft destroyed. Complete top end rebuild cost me $8500. Same problem as the previous recall.

first we had coil issues then it turned out to be the lifters now we are being told we need a new 6.2l v8 engine.

The contact owns a 2017 GMC Sierra Denali. The contact stated that while driving approximately 40 MPH, the check engine warning light illuminated. The contact stated that the vehicle was shuddering and vibrating. The contact pulled over and opened the hood with the engine running. The contact stated that there was an abnormal ticking sound coming from the engine. The vehicle was driven to an independent mechanic, who diagnosed the vehicle and determined that the fuel injectors needed to be replaced. The vehicle was repaired; however, the vehicle was still running rough. The contact was advised by the mechanic that the fuel injectors needed to be reprogrammed, and the vehicle was taken to a dealer. The dealer reprogrammed the fuel injectors, but the vehicle was still running rough. The dealer had not opened the engine up to diagnose the failure; however, the dealer thought that there might be a failure with connecting rods. The vehicle was not repaired. The contact researched online and related the failure to NHTSA Campaign Number: 25V274000 (Engine and Engine Cooling); however, the VIN was not included in the recall. The manufacturer was not informed of the failure. The failure mileage was approximately 105,000.

Truck was in park idling and it started to run really rough so I turned it off. Wouldn’t start again. Now it needs a new motor.

Lifters and rollers failed. Vehicle is at a repair facility and it has been confirmed that the rollers on the cam seized causing metal shavings to build up in the oil. No symptoms or warning lights showed up before the problem was identified.

My truck is currently experiencing the connecting rod and/or crankshaft engine components that may have manufacturing defects that has lead to engine damage and engine failure. My truck is currently being looked at a shop for this exact issue. GM recently recalled more than 597,000 vehicles due to engine failures, according to you, the National Highway Traffic Safety Administration. The recall however only lists vehicles within the years of 2021-2024. My vehicle has the same engine 6.2L V8 gas as the recall and I don't find it a coincidence that I have the same EXACT engine experiencing the same EXACT issue! I attempted to speak to GM but they just kept saying my vehicle is not listed on the recall and refuse to investigate this. I included my conversation with them.

#6 cylinder AFM lifter failure. Inspected by a technician.

Vehicle went into limp mode. 36 check engine codes popped up all related to cam shaft and lifter issues. Vehicle was taken to a shop and it has been determined that the passenger side lifters and rollers have sized due to the active fuel management system. This is the L86 GM 6.2 liter motor, that has developed the same issues that the L87 motor is being investigated for. There where no tail tail signs or check engine lights that were on prior the the lifter failure.

The contact owns a 2017 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, there was a tapping sound coming from the engine compartment, with the check engine warning light illuminated. The contact also stated that the vehicle lost motive power. The vehicle was towed to the dealer, where it was diagnosed, and determined that the lifter rod had failed and needed to be replaced. The vehicle was repaired. The manufacturer was not made aware of the failure. The approximate failure mileage was 126,581.

The contact owns a 2017 GMC Sierra 1500. The contact stated that on four separate occasions while driving at highway speeds, the vehicle shut off with the check engine warning light illuminated. The contact stated that after each failure, the vehicle was towed to a dealer and the contact was informed each time that the failure was related to the active fuel management system. The manufacturer was notified of the failure after the first failure and the contact was informed that the repair would be covered under warranty. The contact stated that each time that the vehicle was towed to a dealer, the lifters and pushrods were replaced under warranty; however, the failure returned almost a month after each repair. After the most recent failure, the dealer pushed the manufacturer to replace the engine. The vehicle was repaired; however, the contact expressed a fear of driving the vehicle due to the repeated failures. The failure mileage was approximately 60,000.

lifter going bad

The contact owns a 2017 GMC Sierra 1500. The contact stated that while driving at various speeds, the vehicle unintendedly decelerated. The vehicle hesitated and was shaking abnormally while accelerating. The check engine warning light was illuminated. The vehicle was taken to the dealer where it was diagnosed that the engine had failed due to the pistons misfiring and then collapsing. The contact was informed that the engine needed to be replaced. The vehicle had not been repaired. The manufacturer was made aware of the failure and a case was opened. The failure mileage was approximately 99,000.

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.

hard shift when taking off and excessive burning of oil

The contact owns a 2017 GMC Sierra 1500. The contact stated that while driving at various speeds, the vehicle jerked and stalled with the check engine warning light illuminated. The manufacturer was notified of the failure and informed the contact that there were no recalls on the VIN related to the failure. The contact was referred to the dealer for assistance. The vehicle was not diagnosed or repaired. The failure mileage was unknown.

Truck started to jerk if driven over 20 mph. Before this the dashboard (electric) notification showed truck heating up but the temperature gage was not reading any overheating. Prior to this the whole electrical system in the truck started to mess up. The radio changed channels without actually changing the radio channels. Unable to connect the Bluetooth because it calls my phone contacts at random. Had to get a new transmission that cost 5,000 and this was recent. The truck is still jerking but is drivable over 20 mph.

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.

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.

Over some time we had noticed a chirping / pulsating sound when starting the engine after it was fully cooled down. Cold start. This sound over the last few months has been increasingly getting worse. We asked our dealer to check things over and determine what could be the issue on a regular service visit for oil change. They could not find a reason but said a service visit with a full line mechanic would be needed to diagnose the issue. We did our own closer look and diagnosing just where the sound and smell of oil fumes or gases were coming from and found the Left side (drivers) rear / back cylinder exhaust manifold bolts to be broken off and gone. There are a total of 5 studs and the rear two had failed and gave away to now allow the exhaust manifold to leak exhaust fumes that are obvious in the cab at startup. This is a pretty major failure and safety problem we feel that GM needs to take action on and correct.

Greetings, he has a complaint from our consumers in the United Arab Emirates to the agent, and he is using incorrect oils in the atmosphere and nature of the region

TL* THE CONTACT OWNS A 2017 GMC SIERRA 1500. THE CONTACT STATED THAT WHILE DRIVING, HE DETECTED AN ANTI-FREEZE ODOR. THE CONTACT CHECKED UNDER THE HOOD AND BECAME AWARE THAT THE RADIATOR WAS CRACKED. THE VEHICLE WAS TAKEN TO VANGUARD BUICK GMC OF CARROLLTON (2700 N INTERSTATE 35E, CARROLLTON, TX 75007) WHERE THE DEALER INFORMED THE CONTACT THAT THE RADIATOR NEEDED TO BE REPLACED. THE VEHICLE REMAINED AT THE DEALER FOR THE REPAIR. THE DEALER INFORMED THE MANUFACTURER OF THE FAILURE, AND THE MANUFACTURER INFORMED THE DEALER THAT THE CONTACT NEEDED TO PAY TO REPLACE THE RADIATOR. THE FAILURE MILEAGE WAS 70,000. ## VIN PASSED ## GMC 2017 SIERRA ##*DT*JB

PINHOLE LEAK IN A/C CONDENSER APPEARS TO BE A SYSTEMIC PROBLEM IN NUMEROUS GM VEHICLES UTILIZING THE SAME PARTS.

RADIATOR LEAK AT 55000 MILES REQUIRING REPLACEMENT OF RADIATOR

RADIATOR LEAKING AND HAD TO BE REPLACED.