Powertrain Shuddering/Hesitation

Owners report shuddering or hesitation during acceleration, particularly at lower mileage. This can be indicative of transmission or engine control issues. Estimated repair cost: $500 - $1,500.

Electrical System Malfunctions

Complaints include issues with infotainment screens, keyless entry systems, and other electronic components. These can range from minor annoyances to significant operational disruptions. Estimated repair cost: $200 - $1,000.

Reports of persistent squealing or grinding from the brakes suggest potential wear or issues with pads, rotors, or caliper hardware. Early inspection is advised. Estimated repair cost: $300 - $800.

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2021 GMC Terrain Maintenance guide

Name: Maintenance dataset for 2021 GMC Terrain
Creator: Carfocal

v1.0Updated May 30, 2026Daniel Wilson4 Sources Analyzed

MAINTENANCE SUMMARY

The 2021 GMC Terrain, with an 'Average' reliability verdict, presents potential owners with maintenance considerations centered around its powertrain and electrical systems, which account for the highest complaint percentages. Vigilant attention to these areas, alongside routine maintenance, is crucial for mitigating potential issues.

View Critical Issue: Engine Oil Consumption

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Reliability Score

Est. Annual Maintenance Cost

$400 - $700

TSBs & Recalls

66 TSBs | 3 Recalls

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Key Takeaways

Focus on powertrain and electrical system maintenance due to high complaint volumes.
Regularly inspect brakes, as they are a notable complaint area.

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Critical service intervals

Common failure analysis

Symptoms and prevention guidance