2021 GMC Terrain Pre-Purchase Inspection Checklist
Known Issues — 2021 GMC Terrain
MODERATE
1.5L Turbo engine carbon buildup on intake valves
MODERATE
9-speed automatic transmission shudder
MODERATE
Infotainment system freeze or crash
MODERATE
Oil consumption on 1.5T engine
MINOR
Rear camera image quality degradation
MINOR
Door weather strip wind noise
What to Inspect
- Test 1.5T for rough idle or hesitation
- Test 9-speed transmission for shudder
- Test infotainment for freeze
- Check oil level after drive
- Verify rear camera image quality
- Listen for wind noise from door seals at highway speed
Expected Maintenance Costs
| Service | Interval | Cost |
|---|---|---|
| Oil change (synthetic) | every 7,500 miles | $60-$90 |
| Transmission fluid service | every 45,000 miles | $180-$280 |
| Spark plugs | every 60,000 miles | $120-$200 |
| Intake valve cleaning (DI engine) | every 60,000 miles | $200-$350 |
| Brake service (pads and rotors) | every 40,000 miles | $300-$450 |
| Coolant flush | every 50,000 miles | $100-$150 |
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