Electrical System: Key Stuck in Ignition

Owners report instances where the ignition key cannot be removed from the ignition cylinder. This is a common electrical system fault that can leave the vehicle vulnerable and drain the battery. Estimated repair cost: $200 - $500.

Engine Oil Cooler Line Failure

Some reports indicate failures of the engine oil coolant lines, which can lead to significant oil leaks and potential engine damage if not addressed promptly. This issue was noted at higher mileage points. Estimated repair cost: $600 - $1,000.

Fuel Pump Recall (18V358000)

A recall addressed the potential detachment of the high-pressure fuel pump, which could damage fuel lines and cause leaks. Owners should verify this recall service has been completed. Estimated repair cost: $0 (Recall).

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2018 GMC Canyon Maintenance guide

Name: Maintenance dataset for 2018 GMC Canyon
Creator: Carfocal

v1.0Updated May 30, 2026Ryan Davis4 Sources Analyzed1 Critical Recalls

MAINTENANCE SUMMARY

The 2018 GMC Canyon presents a Below Average reliability verdict, primarily due to significant powertrain issues, specifically transmission shudder and rough shifting, and electrical system concerns like the key sticking in the ignition. Owners should prioritize regular transmission fluid checks and be vigilant for early signs of these common problems.

View Critical Issue: Transmission Shudder and Rough Shifting

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Reliability Score

Est. Annual Maintenance Cost

$400 - $700

TSBs & Recalls

495 TSBs | 1 Recalls

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Key Takeaways

Prioritize transmission health due to prevalent shudder and rough shifting complaints.
Be vigilant for electrical system issues, particularly the key sticking in the ignition.

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Critical service intervals

Common failure analysis

Symptoms and prevention guidance