2021 GMC Sierra 1500 Pre-Purchase Inspection Checklist
Known Issues — 2021 GMC Sierra 1500
CRITICAL
2.7L Turbo I4 timing chain rattle cold start
CRITICAL
AFM/DFM lifter failure on 5.3L and 6.2L V8
MODERATE
8/10-speed transmission rough shifts
MODERATE
Carbon buildup on 2.7T DI engine
MODERATE
3.0L Diesel turbo vane actuator sticking
MINOR
Rear camera image quality degradation
What to Inspect
- On 2.7T — listen for cold-start timing chain rattle
- On 5.3/6.2 V8 — check for AFM lifter tick
- Test transmission shift quality
- On Diesel — check turbo vane for fault codes
- Test MultiPro tailgate all positions
- Verify rear camera image quality
Expected Maintenance Costs
| Service | Interval | Cost |
|---|---|---|
| Oil change (synthetic) | every 7,500 miles | $80-$120 |
| Transmission fluid service | every 45,000 miles | $200-$350 |
| Spark plugs (V8) | every 60,000 miles | $200-$350 |
| Rear differential fluid | every 45,000 miles | $100-$150 |
| Transfer case fluid | every 45,000 miles | $80-$130 |
| Intake valve cleaning (2.7T) | every 60,000 miles | $250-$400 |
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