P1171 GMC Code - Fuel System Lean During Acceleration
Quick Answer
The P1171 GMC code indicates that the fuel system is running lean during acceleration. Common causes include Clogged fuel filter, Malfunctioning fuel pump, Vacuum leak. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P1171 GMC indicates Fuel System Lean During Acceleration.
- Common causes
- Common causes include Clogged fuel filter, Malfunctioning fuel pump, Vacuum leak.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
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Code P1171 GMC Description
The P1171 GMC code indicates that the fuel system is running lean during acceleration. This means that there is an imbalance in the air-fuel mixture, with more air entering the engine than fuel during acceleration. This can lead to a variety of issues with the vehicle's performance, including reduced power, hesitation, rough idling, and potentially even engine misfires.
Common Causes of P1171 GMC
- Clogged fuel filter
- Malfunctioning fuel pump
- Vacuum leak
- Faulty oxygen sensor
- Issue with the mass airflow sensor
Symptoms of P1171 GMC
- Reduced power and acceleration
- Hesitation or stumbling during acceleration
- Rough idling or engine misfires
- Illumination of the Check Engine Light
- Increased fuel consumption
How to Fix P1171 GMC
- Diagnose the root cause of the lean fuel system by performing a comprehensive inspection of the fuel system components.
- Replace the clogged fuel filter or malfunctioning fuel pump, if necessary.
- Repair any vacuum leaks in the intake system.
- Replace the faulty oxygen sensor or mass airflow sensor, as needed.
- Clear the diagnostic trouble codes and test drive the vehicle to ensure that the issue has been resolved.
Cost to Fix P1171 GMC
The typical repair costs for addressing a lean fuel system during acceleration can vary depending on the specific cause of the issue. In general, replacing a fuel filter or oxygen sensor can cost between $100 and $300, while repairing a vacuum leak or replacing a mass airflow sensor may range from $200 to $500. Labor costs can add an additional $80 to $150 per hour, depending on the shop's rates and location. It's recommended to consult with a qualified mechanic to obtain a more accurate estimate based on the vehicle's make and model.
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