2018 GMC Canyon Problems: 6 Known Issues

2018 GMC Canyon Problems: 6 Known Issues | Au7o

NHTSA Recalls10 recalls

FUEL SYSTEM, GASOLINE:STORAGE:TANK ASSEMBLY

General Motors, LLC (GM) is recalling certain 2024 Chevrolet Colorado and GMC Canyon vehicles. The lock ring that secures the fuel pump to the fuel tank assembly may not have been fully locked during assembly, which can result in a fuel leak during a crash.

Campaign #24V49100028/06/2024

AIR BAGS:FRONTAL:PASSENGER SIDE:INFLATOR MODULE

General Motors, LLC (GM) is recalling certain 2024–2026 GMC Canyon AT4X AEV vehicles. Incorrect sensing and diagnostic module (SDM) software may cause a second stage passenger air bag deployment when only a first stage is intended. As such, these vehicles fail to conform to Federal Motor Vehicle Safety Standard (FMVSS) number 208, “Occupant Crash Protection."

Campaign #25V85600011/12/2025

EXTERIOR LIGHTING:HEADLIGHTS

General Motors, LLC (GM) is recalling certain 2024 GMC Canyon vehicles. The headlights may flicker while driving and while the vehicle is in park. As such, these vehicles fail to comply with the requirements of Federal Motor Safety Standard number 108, "Lamps, Reflective Devices, and Associated Equipment."

Campaign #24V67300012/09/2024

SEATS:CRITICAL FASTENERS

General Motors, LLC (GM) is recalling certain 2022 GMC Canyon and Chevrolet Colorado vehicles equipped with a manual passenger seat. The front passenger seat may have a hook attachment that was not properly welded, allowing it to separate from the inboard track of the seat frame.

Campaign #22V37500026/05/2022

EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL

General Motors has decided that certain 2027 Chevrolet Bolt EV, 2025-2026 Cadillac OPTIQ, Chevrolet Colorado, Equinox EV, GMC Canyon, 2026 Buick Enclave, Envision, Cadillac CT5, Escalade, Escalade ESV, Escalade IQ, Escalade IQL, LYRIQ, VISTIQ, Chevrolet Blazer EV, Corvette Convertible, Corvette Coupe, Corvette Convertible E-Ray, Equinox, Silverado 1500, 2500, 3500, Silverado EV, Suburban 1500, Tahoe, Traverse, GMC Acadia, Hummer EV Pickup, Hummer EV SUV, Sierra 1500, 2500, 3500, Sierra EV, Terrain, Yukon, and Yukon XL vehicles. The radio may not have been set to the correct status to download the electronic owner's manual during production. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 208, “Occupant Protection.”

Campaign #26V11400026/02/2026

+ 5 more recalls. Check all on NHTSA.gov

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Frequently Asked Questions

What are the most common GMC Canyon problems?

According to Au7o's analysis of 1,360+ owner reports, the 2018 GMC Canyon has 6 documented issues. The most frequently reported are: 8L45 8-Speed Transmission Torque Converter Shudder, Active Fuel Management (AFM) Lifter Failure (V6), 2.8L Duramax DEF System Faults and DPF Regeneration Issues. Of these, 2 are rated critical and should be addressed promptly.

Is the GMC Canyon reliable?

The 2018 GMC Canyon has 6 known issues documented across 1,360+ owner reports. 2 issues are rated critical: 8L45 8-Speed Transmission Torque Converter Shudder and Active Fuel Management (AFM) Lifter Failure (V6). Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.

How much does it cost to fix common GMC Canyon problems?

Repair costs for known GMC Canyon issues range from $80 to $4,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, 8L45 8-Speed Transmission Torque Converter Shudder, typically costs $150-$4,000 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What is the 2015-2025 GMC Canyon 8L45 8-Speed Transmission Torque Converter Shudder?

The 2015+ Canyon with the 3.6L V6 uses the GM 8L45 8-speed automatic (smaller sibling of the 8L90 in full-size trucks) which suffers the same torque converter lock-up clutch shudder at light throttle between 25-50 mph. The clutch friction material degrades and contaminates the fl… Repairs typically run $150-$4,000. Severity: high.

What is the 2015-2025 GMC Canyon Active Fuel Management (AFM) Lifter Failure (V6)?

The 3.6L V6 with Active Fuel Management experiences lifter failure where the AFM lifters collapse, causing misfires and a ticking noise. The collapsing lifter can damage the camshaft lobe if not addressed. Repairs typically run $800-$2,500. Severity: high.

What is the 2016-2025 GMC Canyon 2.8L Duramax DEF System Faults and DPF Regeneration Issues?

The 2016+ Canyon Duramax 2.8L LWN diesel uses DEF (Diesel Exhaust Fluid) injection and a DPF (Diesel Particulate Filter) as part of its SCR emissions system. Owners frequently report DEF quality/level sensor faults, DPF regeneration failures in stop-and-go use, DEF pump failures,… Repairs typically run $200-$3,500. Severity: medium.

What is the 2015-2022 GMC Canyon 3.6L V6 (LGZ) Excessive Oil Consumption from Clogged PCV Orifice?

The 3.6L V6 lacks a serviceable PCV valve and instead uses a fixed PCV orifice and drain-back baffle molded into a valve cover. The orifice and baffle drain hole sludge up and clog, pulling oil into the intake and causing excessive oil consumption (owners report ~1 qt per 1,000 m… Severity: medium.

What is the 2015-2022 GMC Canyon P0420/P0430 Catalytic Converter Efficiency Failure (3.6L V6)?

On the 3.6L V6 (LGZ) Canyon, the catalytic converters lose efficiency and trigger P0420 (Bank 1) and/or P0430 (Bank 2), often a downstream consequence of the engine's PCV-related oil consumption that contaminates the converter substrate and O2 sensors. Both converters can fail ar… Severity: medium.

What is the 2015-2025 GMC Canyon Front Suspension Clunk and Stabilizer Bar End Link Failure?

The 2015+ Canyon experiences front end clunking and rattling over bumps and during steering inputs. The most common cause is worn front stabilizer bar end links, though lower control arm ball joints and upper strut mounts also contribute. The end links use a ball-and-socket desig… Repairs typically run $80-$800. Severity: low.

2018 GMC Canyon Problems: 6 Known Issues

All 6 Known Issues

2015-2025 GMC Canyon: Active Fuel Management (AFM) Lifter Failure (V6)#

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2016-2025 GMC Canyon: 2.8L Duramax DEF System Faults and DPF Regeneration Issues#

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2015-2022 GMC Canyon: 3.6L V6 (LGZ) Excessive Oil Consumption from Clogged PCV Orifice#

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2015-2025 GMC Canyon: 8L45 8-Speed Transmission Torque Converter Shudder#

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2015-2022 GMC Canyon: P0420/P0430 Catalytic Converter Efficiency Failure (3.6L V6)#

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2015-2025 GMC Canyon: Front Suspension Clunk and Stabilizer Bar End Link Failure#

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Frequently Asked Questions

What are the most common GMC Canyon problems?

Is the GMC Canyon reliable?

How much does it cost to fix common GMC Canyon problems?

What is the 2015-2025 GMC Canyon 8L45 8-Speed Transmission Torque Converter Shudder?

What is the 2015-2025 GMC Canyon Active Fuel Management (AFM) Lifter Failure (V6)?

What is the 2016-2025 GMC Canyon 2.8L Duramax DEF System Faults and DPF Regeneration Issues?

What is the 2015-2022 GMC Canyon 3.6L V6 (LGZ) Excessive Oil Consumption from Clogged PCV Orifice?

What is the 2015-2022 GMC Canyon P0420/P0430 Catalytic Converter Efficiency Failure (3.6L V6)?

What is the 2015-2025 GMC Canyon Front Suspension Clunk and Stabilizer Bar End Link Failure?