Au7o mascotAu7o
Known IssuesTest Hub demo
  1. Au7o
  2. /
  3. Known Issues
  4. /
  5. GMC
  6. /
  7. Canyon
GMC · Known Issues

2020 GMC Canyon Problems: 6 Known Issues

2020 model year · 1,360+ owner reports · Updated September 2026

Share:@au7o.io

2020 · All trims · All engines

Choose the year and equipment for your written issues and visual request.

No email neededHow interest is saved

Interest applies to the selected vehicle and configuration; it is not a reservation. Voting stores a first-party identifier for up to 180 days to prevent repeat votes. No account or email is needed. Clearing cookies or using another device may count separately. Privacy

Known IssuesMotorcycle IssuesDTC LookupDrivePricingAboutTermsPrivacyCookiesConsentData rightsCopyrightFeedback
Share:@au7o.io

Vehicle data and repair guidance on this site are compiled with AI assistance and may contain errors. Always verify with your service manual or a qualified mechanic.

Data protection representation

DataRep representative in the United KingdomDataRep representative in the European Union
Au7o · 2026
Built for DIY mechanics. Privacy-first.
Explore free Hub demo

Visual coming soon

Your interest helps us choose what to build next.

Visual Known Issues · Coming soon

$4.99/month plus taxes at launch · No payment today

Preview the XT6 example
Issue summary

According to Au7o's analysis of 1,360+ owner reports, the 2020 GMC Canyon has 6 documented known issues, with 2 rated critical. The most serious are 8L45 8-Speed Transmission Torque Converter Shudder ($150-$4,000 repair) and Active Fuel Management (AFM) Lifter Failure (V6) ($800-$2,500 repair). The most commonly reported issue is Front Suspension Clunk and Stabilizer Bar End Link Failure with 510 owner reports. Across all issues with published estimates, repair costs range from $80 to $4,000. DIY maintenance guides at au7o.io.

In This Article

  • Canyon Engine3
  • Canyon Transmission1
  • Canyon Emissions1
  • Canyon Suspension1
  • Recalls10
  • FAQ
Get Started
Back to top

In This Article

  • Engine3
  • Transmission1
  • Emissions1
  • Suspension1
  • Recalls10
  • FAQ

All 6 Known Issues

Filter:
ALL YEARS202620252024202320222021202020192018201720162015

On the 2015-2025 GMC Canyon, 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.

This issue also affects: Buick LeSabre, Buick Park Avenue, Buick Cascada

Common Symptoms

  • Ticking or tapping from engine
  • Misfire on specific cylinders
  • Check engine light
  • Rough idle

How to Fix

Replace failed lifters and inspect camshaft for damage. AFM delete kits are available that disable cylinder deactivation and replace all AFM lifters with standard lifters. Requires ECM tune to disable AFM.

Typical repair cost:$800 - $2,500

Research This Issue

GoogleRedditYouTubeNHTSA
Community Reported
Medium Confidence
Community reported
390 owners

On the 2016-2025 GMC Canyon 2.8L Duramax LWN, 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, and NOx sensor faults. Trucks used primarily for short trips often cannot complete DPF regeneration cycles, leading to DPF plugging and the truck going into reduced power mode. GM issued multiple TSBs on DEF sensor calibration and DPF regen procedures.

This issue also affects: Chevrolet Cruze, Chevrolet Silverado 1500, Chevrolet Silverado 2500HD

Common Symptoms

  • Check engine light with DEF quality codes (P204F, P2BAD, P20EE)
  • Reduced Engine Power message
  • DIC message: DEF Quality Poor - see dealer
  • Rough idle or loss of power (plugged DPF)
  • Regeneration warning lamp
  • Exhaust smoke during forced DPF regen cycle
  • Speed limiter engaging below 5 mph when DEF is empty

How to Fix

For DPF regeneration issues: take a 20+ minute highway drive at 55+ mph weekly to allow forced regen. For DEF sensor codes: replace DEF quality sensor (GM 84006963). For plugged DPF: forced stationary regeneration at dealer. Keep DEF tank above 1/4 to avoid speed limiter activation. Use only API certified BlueDEF or equivalent.

Typical repair cost:$200 - $3,500

Research This Issue

Based on 390 owner reports

GoogleRedditYouTubeNHTSA
Community Reported
High Confidence390 owner reportsLast reported by owners Feb 2026Reviewed Feb 2026

On the 2015-2022 GMC Canyon, 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 miles). Severe cases foul spark plugs and contaminate the catalytic converters.

Common Symptoms

  • Low oil level / adding oil between changes
  • Blue smoke from exhaust on startup or acceleration
  • Oily residue pooling in the intake resonator/manifold
  • Fouled spark plugs

How to Fix

Verify consumption with GM's oil consumption test. Clean the clogged PCV orifice/baffle drain or replace the affected valve cover with the redesigned part; address underlying blow-by if present. Keep oil changes on schedule and monitor level between services.

Research This Issue

GoogleRedditYouTubeNHTSA
Community Reported
Medium ConfidenceVerifiedReviewed Jun 2026
Community reported
460 owners

On the 2015-2025 GMC Canyon, 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 fluid. GM issued TSB 18-NA-355 and Customer Satisfaction Program 18302 extending coverage to 6 years/100,000 miles. The fix and fluid are identical to the Sierra 1500 8L90 procedure — Mobil 1 Synthetic LV ATF HP (GM 19417577). This is the same issue affecting the Chevrolet Colorado V6.

This issue also affects: Chevrolet Colorado, Chevrolet Camaro, GMC Sierra 1500

Common Symptoms

  • Shudder or vibration at light throttle 25-50 mph
  • Rumble strip sensation at highway cruising
  • Harsh 1-2 shift from stop
  • Transmission hunting between 7th and 8th gear
  • Shudder disappears when throttle is increased

How to Fix

Full fluid exchange with Mobil 1 Synthetic LV ATF HP (GM 19417577 / Mobil 124715). Check CSP 18302 coverage. Torque converter replacement (GM 24288818 for 8L45) if fluid exchange fails. Full exchange requires 10-12 quarts for the 8L45.

Typical repair cost:$150 - $4,000

Research This Issue

Based on 460 owner reports

GoogleRedditYouTubeNHTSA
Community Reported
High Confidence460 owner reportsLast reported by owners Feb 2026Reviewed Feb 2026

On the 2015-2022 GMC Canyon, 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 around similar mileage since they age under identical conditions.

This issue also affects: Chevrolet Cruze, Chevrolet Equinox, Chevrolet Silverado 2500HD

Common Symptoms

  • Check engine light with P0420 and/or P0430
  • Reduced fuel economy
  • Failed emissions/smog test
  • Sulfur/rotten-egg exhaust smell

How to Fix

Diagnose before replacing: rule out a faulty downstream O2 sensor or exhaust leak, and correct any oil-consumption root cause (PCV orifice/valve cover) first so the new converter is not re-poisoned. Replace the affected catalytic converter(s) once root cause is addressed.

Research This Issue

GoogleRedditYouTubeNHTSA
Community Reported
Medium ConfidenceVerifiedReviewed Jun 2026
Community reported
510 owners

On the 2015-2025 GMC Canyon, 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 design that wears quickly on trucks used off-road or in harsh winter road conditions. GM issued TSB PIT5488 for front end noise diagnosis on the Canyon/Colorado platform. The issue is shared with the Chevrolet Colorado, which shares the identical GMSV platform.

This issue also affects: Chevrolet Colorado

Common Symptoms

  • Clunking noise from front suspension over bumps
  • Rattling at low speed over rough surfaces
  • Clunk when turning steering wheel at parking lot speeds
  • Front end noise when rocking the truck side to side
  • Visible play in end link ball joints

How to Fix

Replace front stabilizer bar end links (Moog K750744, or OEM GM 23377014). Inspect and replace ball joints if play detected (Moog K500119 lower ball joint). Upper strut mount replacement if clunk is isolated to strut area (GM 84131517). Torque all suspension fasteners to spec — loose bolts cause clunking symptoms.

What you need to fix it

Only diagnosis- and fitment-reviewed repair parts are linked here.

  • Suspension Stabilizer Bar Link
    Cross-refK700902

    Fitment confirmed against the ShowMeTheParts catalog for this vehicle's year and engine.

    eBay

As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.

Typical repair cost:$80 - $800

Research This Issue

Based on 510 owner reports

GoogleRedditYouTubeNHTSA
Community Reported
High Confidence510 owner reportsLast reported by owners Feb 2026Reviewed Feb 2026
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."

🔧
A mechanic who knows YOUR exact car
Answers tuned to your year, make, model & trim — not generic advice. Save your garage so it always has the right context.
Get ahead of GMC Canyon problems — free
Leave your email and we'll alert you the moment there's a new recall or known issue for your GMC Canyon. Free, no account needed.

Don't see your problem? Describe your symptoms to get a diagnosis, or get a full repair guide.

Other GMC Models

GMC Sierra 150035GMC Terrain26GMC Yukon XL24GMC Sierra 3500HD24GMC Acadia22GMC Yukon21

Frequently Asked Questions

What are the most common GMC Canyon problems?

According to Au7o's analysis of 1,360+ owner reports, the 2020 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 2020 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.

Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.

Data sourced from 1,360+ owner reports, NHTSA recalls, TSBs, and automotive forums.

Campaign #24V67300012/09/2024

SEAT BELTS

General Motors, LLC (GM) is recalling certain 2020 Chevrolet Bolt EV and 2021 GMC Canyon and Sierra 1500, 2500 and 3500, Yukon, Yukon XL, Cadillac Escalade and Escalade ESV and Chevrolet Blazer, Camaro, Colorado, Equinox, Silverado 1500, 2500 and 3500, Suburban and Tahoe vehicles. Incorrect bolts may have been used at one or more fastening locations to secure the seat belts to the vehicle. If an incorrect bolt was used, the seat belt may not be properly attached to the vehicle.

Campaign #20V81100023/12/2020

EQUIPMENT:OTHER:LABELS

General Motors, LLC (GM) is recalling certain 2021 GMC Canyon vehicles. The load carrying capacity printed on the Tire and Loading Information placard is 22.5 kg (51 lbs.) more than intended. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 110, "Tire Selection and Rims."

Campaign #21V49700001/07/2021

+ 5 more recalls. Check all on NHTSA.gov

Enter your VIN at NHTSA.gov to check recalls specific to your vehicle.

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.