GMC Sierra Trouble Codes, Symptoms & Recalls
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Common check engine codes on the GMC Sierra
- P0420 — Catalyst System Efficiency Below Threshold (Bank 1)
- P0300 — Random/Multiple Cylinder Misfire Detected
- P0171 — System Too Lean (Bank 1)
- P0442 — Evaporative Emission System Small Leak Detected
- P0455 — Evaporative Emission System Large Leak Detected
- P0128 — Coolant Temperature Below Thermostat Regulating Temperature
- P0401 — EGR Insufficient Flow Detected
- P0440 — Evaporative Emission Control System Malfunction
- P0301 — Cylinder 1 Misfire Detected
- P0174 — System Too Lean (Bank 2)
Common GMC Sierra symptoms
- GMC Sierra car shaking when braking
- GMC Sierra brakes squealing when stopping
- GMC Sierra check engine light on
- GMC Sierra car won't start
- GMC Sierra car overheating
- GMC Sierra car loses power when accelerating
- GMC Sierra car running or idling rough
- GMC Sierra white smoke from exhaust
- GMC Sierra blue smoke from exhaust
- GMC Sierra battery light on while driving
- GMC Sierra car pulls to one side
- GMC Sierra car ac not blowing cold
Maintenance & recalls
GMC Sierra maintenance resources · GMC Sierra NHTSA recalls & complaints