21 Common GMC Problems and Solutions

GMC is known for its powerful and reliable American lineup, offering a blend of utility and performance. Despite this reputation, a few of this auto giant’s models—like the Sierra, Yukon, and Terrain—face consistent problems, frustrating their owners. With in-depth research and reliable sources, this comprehensive guide explores the 21 most common GMC problems and solutions for post-2015 models. Whether you are seeking solutions to your current car problems or insightful knowledge for future considerations, this article will teach you about GMC’s common issues and their fixes. Read on to make your GMC ownership a seamless experience. Let’s dive in.

21 common GMC problems and solutions:

1. Engine Failures in 6.2L V8 Engines: Diagnose the engine at a GMC UAE service center; replace defective crankshafts and rods with OEM parts.

2. Transmission Hesitation and Slipping: Replace worn clutch plates and solenoids; flush and refill the transmission fluid to ensure proper hydraulic pressure.

3. Transmission Control Module (TCM) Software Issues: Inspect TCM; reflash with updated software; conduct diagnostic scans to verify module stability.

4. Connecting Rod Bearing Failures in L87 V8 Engines: Replace faulty bearings with OEM-spec components; monitor engine oil flow every 8,000 km.

5. Valve Lifter Lock Pin Spring Breakage: Check valve lifters; use genuine parts; monitor engine performance.

6. Fuel Injection Pump Failures: Diagnose fuel system; replace faulty fuel pumps and clean system; use high-quality fuel.

7. Excessive Oil Consumption: Inspect the engine for faulty piston rings and replace them with OEM parts.

8. Rear Main Seal Oil Leaks: Replace faulty seals with OEM components; check for leaks and oil levels.

9. Airbag Software Defects: Diagnose airbag system; reflash control module with updated software.

10. eBCM Software Failure: Update software using OEM tools; test brake performance and fluid levels.

11. Child Seat Installation Issues: Test LATCH anchors; clean or replace anchors to meet safety standards; verify child seat stability during inspections.

12. Seat Belt Pretensioner Issues: Replace faulty units with OEM parts; test belt tension every now and then.

13. Infotainment System Freezing: Diagnose infotainment system; update software to resolve glitches; reset system and check firmware.

14. False Obstacle Detection by Front Camera Module: Recalibrate software to correct detection; clean lenses and test AEB.

15. Steering System Problems: Replace worn racks or pumps with genuine parts; check steering fluid levels.

16. HVAC Condenser Failures: Check the HVAC system; replace defective condensers; service HVAC and check refrigerant.

17. Tailgate Unlatching Due to Water Intrusion: Repair faulty latches and seals; check for water ingress after rain.

18. Headlight Flickering: Replace or repair faulty modules; clean lenses and verify output.

19. Tail Light Malfunctions: Replace defective wiring or bulbs with genuine parts; check functionality.

20. Windshield Wiper Malfunctions: Diagnose wiper system; repair faulty modules; clean wiper blades.

21. Dashboard Blackout Issues: Replace faulty circuit boards with OEM components; verify panel functionality.

Engine and Powertrain Issues

1. Engine Failures in 6.2L V8 Engines

What Happens: Crankshaft and connecting rod defects cause engines to stall abruptly, halting vehicle movement. Drivers hear loud knocking or grinding noises while driving. Sudden power loss occurs during acceleration, increasing crash risks.

Why It Occurs: Defective crankshafts and connecting rods, manufactured with substandard materials, fracture under load. These components fail to withstand high torque demands, causing engine seizure. Vibrations from rough UAE roads exacerbate the issue, leading to sudden stalls.

Impact: Engine stalls on Emirates roads strand drivers in hazardous conditions. Engine repair and engine component replacement are too expensive, costing AED 18,000–AED 25,000. Delaying fixes risks complete engine failure, rendering the vehicle inoperable.

How to Fix: Call for on-site car service or take your car to a GMC dealer near you, after confirming recall eligibility for defective component replacement for free. Schedule engine diagnostics every 8,000 km to detect early issues. Refrain from heavy towing until repairs are completed.

Affected Models: Sierra, Yukon (2021–2024).

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2. Transmission Hesitation and Slipping

What Happens: Transmissions delay gear shifts, causing sluggish acceleration on Dubai’s highways. Drivers experience slipping gears, leading to power loss. Jerking motions occur during gear changes, disrupting control.

Why It Occurs: Worn clutch plates Hulks, or faulty solenoids in the transmission fail to engage properly. Fluid contamination from manufacturing debris reduces hydraulic pressure, causing slippage. Heavy stop-and-go traffic in Dubai accelerates wear, leading to hesitation.

Impact: Unpredictable gear shifts increase collision risks on the UAE's jam-packed motorways. Transmission repairs & component replacements are too expensive, costing anywhere from AED 11,000 to AED 18,000. Neglecting transmission issues will lead to frequent breakdowns, compromising reliability.

How to Fix: Fix your GMC transmission issues at a GMC-approved workshop or a service center. Book a recall for transmission diagnostics and clutch repairs. Replace transmission fluid every 10,000 km to maintain performance. Monitor shifting behavior regularly to catch issues early.

Affected Models: Terrain (2016, 2018).

3. Transmission Control Module (TCM) Software Issues

What Happens: TCM software malfunctions cause harsh gear shifts on UAE roads. Vehicles unexpectedly decelerate or move forward without input. Drivers notice erratic transmission behavior during acceleration.

Why It Occurs: Incorrect TCM software coding misinterprets gear selection signals, causing erratic shifts. Overheating electronics during production weakens module performance. Frequent gear changes in UAE traffic overload the system, triggering unintended movements.

Impact: Sudden vehicle movements heighten crash risks on busy Emirates Road. TCM software updates or replacements cost AED 2,000–AED 4,000. Unresolved issues disrupt safe driving, endangering occupants.

How to Fix: Book a recall at a GMC dealer or a verified workshop near you for TCM software updates for free. Get a professional to perform diagnostic scans every 6 months to ensure stability. Check for smooth gear transitions regularly.

Affected Models: Savana (2022–2023).

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4. Connecting Rod Bearing Failures in L87 V8 Engines

What Happens: Connecting rod bearings seize, causing engine failure during drives. You will hear loud knocking sounds during operation, especially at high speeds. Power loss occurs suddenly, halting vehicle movement.

Why It Occurs: Substandard bearing materials wear out prematurely under high engine loads. Insufficient lubrication from faulty oil flow fails to protect bearings. High-RPM driving on routes like UAE highways accelerates failure, leading to seizures.

Impact: Engine failure on the UAE's busy streets and lonely highways strands drivers in unsafe conditions. Bearing and engine repairs cost AED 15,000–AED 22,000, a hefty expense on the owner's side. Ignoring this connecting rod bearing failures in V8 engines results in catastrophic engine damage.

How to Fix: Take your car to a GMC-authorized workshop or a UAE service center for recall-related bearing replacements. Conduct engine diagnostics every 8,000 km to monitor bearing health. Avoid high-RPM driving until repairs are complete.

Affected Models: Sierra, Yukon (2021–2024).

5. Valve Lifter Lock Pin Spring Breakage

What Happens: Valve lifter springs break, causing engine misfires while driving. You might notice rough idling and reduced power output unexpectedly. Loud ticking noises emerge from the engine bay.

Why It Occurs: Weak valve lifter springs, made from defective materials, fracture under pressure. Improper assembly tolerances cause misalignment, leading to valve lifter lock pin spring breakage or failure. Frequent idling in Dubai’s traffic increases stress, triggering misfires.

Impact: Misfires reduce engine performance, risking breakdowns in urban traffic. Valve lifter replacements can cost up to AED 12,000, a massive expense for owners. Neglected issues and delayed repairs lead to severe engine wear over time.

How to Fix: Contact a GMC UAE dealer for recall-related valve lifter replacements. Schedule engine diagnostics every 10,000 km to detect issues. Listen for unusual engine noises regularly for early spring breakage detection.

Affected Models: Sierra, Yukon (2021–2024).

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6. Fuel Injection Pump Failures

What Happens: Fuel pumps fail unexpectedly, causing engine power loss while driving. Metal shavings clog fuel injectors, leading to stalling. Drivers notice erratic engine performance during acceleration.

Why It Occurs: Defective pump impellers wear down, releasing metal debris into the fuel system. Poor sealing allows contaminants to enter, clogging injectors. Inconsistent fuel quality in the UAE accelerates pump degradation, leading to engine failure.

Impact: Engine failure on Emirates' busy & fast-paced roads increases crash risks extensively, endangering everyone on the road. Fuel injection pump repairs & component replacements cost AED 5,000– AED 10,000, affecting the owner's wallet. Neglecting repairs causes complete fuel system failure.

How to Fix: Schedule a recall inspection at a GMC service center for pump replacement. Inspect fuel system components every 12,000 km for early problem detection. Use high-quality fuel to reduce contamination risks.

Affected Models: Sierra, Yukon (2021–2024).

7. Excessive Oil Consumption

What Happens: Engines burn excessive oil, triggering low oil pressure warnings. Drivers must frequently top up oil even while on short drives. Engine performance degrades, risking internal damage.

Why It Occurs: Faulty piston rings allow oil to leak into the combustion chamber, burning it off. Worn valve seals fail to contain oil, increasing consumption. Long drives on UAE highways exacerbate oil loss, risking engine damage.

Impact: Low oil levels cause engine seizures on long cross-emirate drives. Oil consumption increases expenses significantly. Engine rebuilds & component replacements are extremely expensive, costing over AED 11,000 to 22,000. Ignoring the issue leads to permanent engine failure.

How to Fix: Visit a GMC dealer or service center for piston ring or valve seal replacement. Check for recalls for free maintenance. Beware of the oil levels every 2,000 km for early detection and fixes. Address oil pressure warnings immediately.

Affected Models: Terrain (2016–2018). 

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8.  Rear Main Seal Oil Leaks

What Happens: Rear main seals leak oil, reducing engine lubrication. Drivers notice oil puddles under vehicles while parking, especially in the open areas. Engine warning lights may activate due to low oil levels.

Why It Occurs: Defective seals, made from substandard materials, fail to contain oil under pressure. Crankshaft misalignment during assembly causes seal wear. High-speed driving on UAE roads increases oil pressure, triggering leaks.

Impact: Oil leaks reduce engine efficiency on Abu Dhabi’s roads, risking breakdowns. Rear main seal repairs & replacements can easily cost around AED 6,000, impacting your expenses massively. Delaying repairs causes severe engine damage.

How to Fix: Contact a GMC service center near you for seal replacement, if possible, with a recall. Inspect for oil leaks under the vehicle every time before driving away after parking in the open. Maintain regular oil changes to protect engine health.

Affected Models: Sierra, Yukon (2021–2024).

Safety Systems Issues

9.  Airbag Software Defects

What Happens: Dashboard airbag warning lights flash intermittently without any probable cause. On the other hand, airbags fail to deploy during collisions. Drivers notice erratic indicator behavior during startup.

Why It Occurs: Faulty airbag control software misreads crash sensor data, preventing deployment. Manufacturing errors in software coding cause inconsistent performance. Electrical interference from the UAE’s common aftermarket accessories triggers false signals.

Impact: Non-deploying airbags increase injury risks during accidents, especially at high speeds. Airbag Software updates or module replacements will cost up to AED 5,000. Failure to fix compromises occupant safety & may lead to fatalities during accidents.

How to Fix: Check and verify recall status with a GMC dealer near you for software updates for free. Conduct airbag system diagnostics every 6 months taking professional's help. Make sure your dashboard warning lights are consistent with the sensors.

Affected Models: Sierra 2500 HD, Sierra 3500 HD, Yukon, Yukon XL (2015–2017), Terrain (2018).

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10.  Electronic Brake Control Module (eBCM) Software Failure

What Happens: Brake warning lights fail to illuminate, hiding low brake fluid issues. Braking performance weakens on roads gradually, making it difficult to notice immediately. Drivers experience inconsistent brake pedal response.

Why It Occurs: Defective eBCM software fails to detect low brake fluid levels, disabling warnings. Faulty coding from production causes miscommunication with sensors. Dust ingress from the environment clogs sensor pathways, worsening the issue.

Impact: Reduced braking power on Dubai’s busy streets increases collision risks. A proper eBCM software update will cost AED 2,500– AED 4,500. Persistent eBMC software failure & neglected repairs endanger safe stopping ability.

How to Fix: Visit a UAE GMC service center for eBCM software updates via recall. Test brake response every now and then in a safe environment. Don't forget to check brake fluid levels monthly.

Affected Models: Sierra 1500 (2023).

11.  Child Seat Installation Issues

What Happens: LATCH anchorage bars resist secure child seat attachment. Parent drivers struggle to fasten seats properly. Child seats remain loose, failing safety standards.

Why It Occurs: Excess powder coating from manufacturing reduces the LATCH bar grip, hindering secure attachment. Improper application during assembly creates uneven surfaces. UAE's summer Humidity, especially in coastal areas causes coating to harden, worsening installation issues.

Impact: Loose child seats increase injury risks during crashes (accidents), endangering little children in the vehicle. Anchor cleaning, fixes, or replacement easily cost up to AED 2,500. Neglecting serious LATCH anchors  & their timely repairs endangers young passengers.

How to Fix: Take your GMC to any GMC-authorized dealer or book a recall-related LATCH anchor repair. Make sure you inspect LATCH points every month to detect issues early. Test the child's seat stability before trips.

Affected Models: Terrain (2020–2023).

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12.  Seat Belt Pretensioner Issues

What Happens: Seat belt pretensioners fail to tighten during collisions. Drivers notice loose belts during sudden stops in UAE traffic. Occupants experience reduced restraint force.

Why It Occurs: Defective pretensioner mechanisms fail to engage due to weak internal springs. Manufacturing errors cause inconsistent tensioning. Frequent use in the UAE’s stop-start traffic wears out components, preventing proper tightening.

Impact: Inadequate restraint during sudden braking increases injury risks. Pretensioner replacements cost anywhere from AED 2,000 to AED 4,000, hitting your finances. Unresolved seat belt pretensioner issues compromise occupant safety, especially during quick & sudden stops or accidents/collisions.

How to Fix: Schedule a recall inspection at a GMC dealer and/or service center for pretensioner replacement. Check belt tension occasionally. Test the belt locking during sudden braking.

Affected Models: Sierra 2500 HD, Sierra 3500 HD, Yukon, Yukon XL (2015–2017).

Electrical and Software Issues

13.  Infotainment System Freezing

What Happens: Infotainment screens freeze, creating inconvenience while on the road, especially blocking navigation access. Drivers lose control of audio and climate settings. Display errors occur during operation when you need it the most.

Why It Occurs: Software bugs in the infotainment system cause processing errors, freezing the display. Overloaded memory from multiple connected devices slows system response. Inconsistent updates during production fail to address compatibility issues.

Impact: Loss of navigation on UAE motorways hinders efficient driving. It will possibly put occupants at risk as drivers cannot properly access the intended information. Infotainment system updates or component replacements cost AED 1,500–AED 4,500. Serious issues with delayed fixes reduce driver convenience and occupant safety.

How to Fix: Visit a GMC service center or a dealership near you for infotainment software updates or component replacement. Restart the system weekly to clear glitches. Check for firmware updates every 6 months.

Affected Models: Terrain (2016, 2018).

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14. False Obstacle Detection by Front Camera Module

What Happens: Front cameras trigger unexpected Automatic Emergency Braking. Vehicles stop abruptly while driving without obstacle detection. Drivers experience sudden jolts during travel.

Why It Occurs: Faulty camera software misinterprets road markings or shadows as obstacles. Calibration errors during manufacturing cause oversensitivity. Bright sunlight creates reflections & shadows, confusing the camera and triggering braking.

Impact: Unintended braking on highways and busy Emirates streets risks rear-end collisions, endangering lives and property losses. Software recalibration to fix the false obstacle detection by the front camera module costs AED 2,000–AED 3,500. Serious obstacle detection issues disrupt safe driving dynamics.

How to Fix: Get your obstacle detection module checked and fixed at a GMC service center or a dealer. Check for free recalls for camera software updates. Clean camera lenses every now and then to reduce interference. Test AEB in safe conditions monthly.

Affected Models: Canyon (2023).

Mechanical Components Issues

15. Steering System Problems

What Happens: Steering systems resist turning with reduced flexibility, requiring excessive effort. You will struggle on winding rural roads of Ras Al Khaimah and Fujairah. Steering wheel vibrations occur during maneuvers with difficult maneuverability.

Why It Occurs: Worn steering rack gears or faulty power steering pumps reduce responsiveness. Manufacturing defects cause premature component wear. Abrupt maneuvers on uneven roads accelerate degradation, hindering control.

Impact: Poor steering control while driving on Dubai's busy highways increases accident risks. Steering system component repairs or replacements will cost from AED 3,000 to AED 7,000, impacting your expenses. Ignoring the issue compromises your safety on the fast-paced roads of the Emirates.

How to Fix: Check for recalls at GMC dealers in the UAE for free services. Visit a GMC service center near you for steering system diagnostics. Maintain steering fluid levels at all times. Get your steering resistance fixed immediately.

Affected Models: Acadia (2016).

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16. HVAC Condenser Failures

What Happens: HVAC condensers fail miserably, massively affecting cabin cooling or heating as intended. Occupants will experience discomfort in the UAE's extreme heat. Airflow weakens significantly, reducing AC system efficiency while driving.

Why It Occurs: Defective condenser coils leak refrigerant due to weak welds from manufacturing. Dust accumulation from the environment clogs airflow, causing overheating. Poor material quality fails to withstand high ambient temperatures, leading to failure.

Impact: Lack of cooling on the UAE’s summer roads reduces occupants' comfort. Condenser replacements are expensive, costing anywhere from AED 2,500 to AED 5,000. Neglecting HVAC condenser repairs affects cabin livability & convenience for everyone.

How to Fix: Schedule HVAC diagnostics at a GMC dealership for condenser replacement. Check for recalls for free repairs. Inspect cabin temperature regularly to detect early issues and resolutions. Service the HVAC system every 10,000 km.

Affected Models: Terrain (2018), Yukon (2015–2016).

17. Tailgate Unlatching Due to Water Intrusion

What Happens: Tailgates open unexpectedly, spilling cargo/luggage while driving. Drivers hear unlatching noises occasionally, especially on rough terrain. Electronic latch failures disrupt cargo security during adventures.

Why It Occurs: Poorly designed seals allow water to enter the electronic latch mechanism, causing short circuits. Manufacturing defects weaken latch components, leading to tailgate failures and unlatching issues over time. Exposure to the UAE’s occasional heavy rains also triggers unintended unlatching.

Impact: Lost cargo/luggage on Emirates Road with heavy traffic not only affects the owners but also creates hazards for other vehicles traveling at high speeds. Tailgate latch replacements can cost anywhere from AED 1,800 to AED 4,500. Delaying repairs reduces cargo security, endangering everyone on the road.

How to Fix: Contact a GMC service center or a dealer for recall-related latch and seal replacements. Inspect tailgates for water ingress after rain. Use additional cargo restraints until fixed.

Affected Models: Sierra 2500, Sierra 3500 (2020–2024).

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Engine and Powertrain Issues

18. Headlight Flickering

What Happens: Headlights flicker or dim unexpectedly, reducing nighttime visibility. Drivers struggle to drive at night on the UAE's busy roads. Light output fluctuates during operation.

Why It Occurs: Faulty headlight control modules disrupt the power supply, causing flickering. Loose wiring connections from manufacturing vibrate freely over time. Rough terrains exacerbate connection issues, leading to intermittent light failure.

Impact: Poor visibility on busy UAE roads increases collision risks, endangering the occupants. Headlight module replacements cost AED 2,000–AED 4,000. Neglecting repairs violates UAE safety standards, which also attracts traffic fines.

How to Fix: Book an appointment at a GMC service center near you for headlight module repairs. Make sure you check or get your headlight performance checked every 5,000 km. Clean headlight lenses regularly for optimal brightness.

Affected Models: Canyon (2024).

19. Tail Light Malfunctions

What Happens: Tail lights fail or dim irregularly, reducing rear visibility. Other drivers struggle to see your vehicle's taillight signals on the UAE's busy roads, especially at times with less visibility. Warning lights on the dashboard may indicate electrical issues.

Why It Occurs: Defective wiring creates short-circuits, disabling tail lights. Poor bulb socket design or elongated use wear causes overheating and failure. Corrosion from the UAE’s humid weather conditions also accelerates electrical degradation, leading to malfunctions.

Impact: Reduced visibility on Emirates' heavy traffic risks rear-end collisions. Tail light replacements can easily cost from AED 1,000 to AED 2,500. Delaying tail light malfunction repairs compromises your nighttime driving safety.

How to Fix: Contact a GMC UAE dealer for tail light assembly repairs. Get a professional to inspect lights every 3,000 km for functionality. Replace faulty bulbs promptly & wiring.

Affected Models: Yukon (2015–2016).

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20. Windshield Wiper Malfunctions

What Happens: Wipers activate erratically without any instruction or fail to operate when needed. Visibility drops during humid weather or rainstorms & dust events. Drivers notice inconsistent wiper movement — complete windshield wiper malfunction.

Why It Occurs: Faulty wiper control modules send incorrect signals, causing erratic operation. Manufacturing defects weaken module circuitry, leading to windshield wiper malfunctions. Dust buildup from the UAE’s dusty environment can easily disrupt electrical connections, triggering malfunctions.

Impact: Poor visibility in adverse UAE weather increases accident risks, especially on highways and busy streets with frequent stop-and-go traffic. Wiper module replacements cost anywhere between AED 1,500 and AED 3,000. Neglecting windshield wiper malfunction repairs significantly reduces driver safety.

How to Fix: Check for a recall inspection at a GMC UAE online or dealership for wiper module repairs for free. Test wiper functionality at least monthly, even when not needed. Clean wiper blades regularly for optimal performance.

Affected Models: Sierra, Yukon (2021–2024).

21. Dashboard Blackout Issues

What Happens: Instrument panels go dark, hiding crucial information, like speed and fuel data while driving. Drivers lose access to critical information all of a sudden. Warning lights fail to display properly as intended by the driver.

Why It Occurs: Defective dashboard circuit boards short-circuit, causing blackouts. Software glitches from production fail to initialize displays properly. Electrical surges from frequent auxiliary device use overload the system, leading to dashboard mishaps & failure.

Impact: Missing data on busy roads hinders safe driving decisions, compromising occupant safety & possible traffic violations. GMC dashboard issue repairs cost can easily range from AED 2,500 to AED 5,500. Serious dashboard blackout issues increase operational risks.

How to Fix: Visit a GMC UAE service center for dashboard circuit repairs. Get your dashboard functionality and check every service or after every 5,000 km. Report blackouts & repair components immediately to avoid risks.

Affected Models: Sierra, Yukon (2021–2024).

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Final Thoughts

Understanding these 21 most common GMC problems and solutions is the key to your seamless ownership. You learn to prevent issues before they become serious and lead to expensive component replacement. Whether you own a GMC now or plan to do so in the near future, these GMC car problems and their definite solutions are crucial to save a lot in maintenance, repairs, and replacements. Do share your GMC car ownership experiences in the comments, and do tell us if we missed out on some issues along the way.