P0671 2018 GMC Sierra Code - Cylinder 1 Glow Plug Circuit Fault
Quick Answer
The diagnostic trouble code P0671 for a 2018 GMC Sierra indicates a fault in the glow plug circuit of cylinder 1. Common causes include Faulty glow plug in cylinder 1, Wiring issues in the glow plug circuit, Corrosion or poor connections in the electrical system. 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
- P0671 2018 GMC Sierra indicates Cylinder 1 Glow Plug Circuit Fault.
- Common causes
- Common causes include Faulty glow plug in cylinder 1, Wiring issues in the glow plug circuit, Corrosion or poor connections in the electrical system.
- 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 P0671 2018 GMC Sierra Description
The diagnostic trouble code P0671 for a 2018 GMC Sierra indicates a fault in the glow plug circuit of cylinder 1. Glow plugs are essential components in diesel engines that help with cold starts by heating the combustion chamber. When the engine is cold, the glow plugs heat up to ensure proper ignition of the fuel. In this case, a fault in the glow plug circuit of cylinder 1 means that there is an issue with the electrical system responsible for powering the glow plug in that specific cylinder.
Common Causes of P0671 2018 GMC Sierra
- Faulty glow plug in cylinder 1.
- Wiring issues in the glow plug circuit.
- Corrosion or poor connections in the electrical system.
- Faulty glow plug relay.
- Issues with the engine control module (ECM) related to the glow plug circuit.
Symptoms of P0671 2018 GMC Sierra
- Difficulty starting the engine, especially in cold weather.
- Rough idling or misfiring upon startup.
- Decreased fuel efficiency.
- Increased emissions.
- Illumination of the check engine light on the dashboard.
How to Fix P0671 2018 GMC Sierra
- Begin by diagnosing the specific issue by testing the glow plug in cylinder 1 to determine if it is faulty.
- Inspect the wiring and connections in the glow plug circuit for any signs of damage, corrosion, or poor connections. Repair or replace as necessary.
- Test the glow plug relay to ensure it is functioning correctly. Replace if faulty.
- If the issue persists, further diagnostic testing of the ECM may be required to identify any underlying issues with the control of the glow plug circuit.
- Clear the diagnostic trouble code from the vehicle's system after completing the repairs and test the vehicle to ensure proper functioning of the glow plug in cylinder 1.
Cost to Fix P0671 2018 GMC Sierra
The typical repair costs for addressing a cylinder 1 glow plug circuit fault can vary depending on the specific cause of the issue. In general, the cost of replacing a glow plug can range from $50 to $150 per plug, depending on the make and model of the vehicle. Labor costs can add an additional $100 to $200, again depending on the shop's hourly rates and the complexity of the repair. If additional components such as the glow plug relay or ECM need to be replaced, the total repair cost could increase accordingly. It is advisable to consult with a trusted mechanic or auto repair shop to get a more accurate estimate based on the specific circumstances of the vehicle.
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