P0671 2016 GMC Sierra Code - Cylinder 1 Glow Plug Circuit Fault
Quick Answer
The P0671 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates a fault in the cylinder 1 glow plug circuit. Common causes include Faulty glow plug: The glow plug in cylinder 1 may be defective and require replacement, Wiring issues: There could be a problem with the wiring connecting the glow plug to the vehicle's electrical system, Relay failure: The relay that controls the glow plug circuit may be malfunctioning. 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 2016 GMC Sierra indicates Cylinder 1 Glow Plug Circuit Fault.
- Common causes
- Common causes include Faulty glow plug: The glow plug in cylinder 1 may be defective and require replacement, Wiring issues: There could be a problem with the wiring connecting the glow plug to the vehicle's electrical system, Relay failure: The relay that controls the glow plug circuit may be malfunctioning.
- 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 2016 GMC Sierra Description
The P0671 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates a fault in the cylinder 1 glow plug circuit. Glow plugs are essential components in diesel engines that help with cold starting by heating the combustion chamber before ignition. In this case, a fault in the cylinder 1 glow plug circuit means that there is an issue with the electrical system that controls the glow plug in cylinder 1. This can lead to difficulties starting the engine, rough idling, decreased fuel efficiency, and potential engine misfires.
Common Causes of P0671 2016 GMC Sierra
- Faulty glow plug: The glow plug in cylinder 1 may be defective and require replacement.
- Wiring issues: There could be a problem with the wiring connecting the glow plug to the vehicle's electrical system.
- Relay failure: The relay that controls the glow plug circuit may be malfunctioning.
- ECM/PCM failure: A failure in the engine control module or powertrain control module could also trigger this code.
Symptoms of P0671 2016 GMC Sierra
- Hard starting: Difficulty starting the engine, especially in cold weather.
- Rough idling: The engine may run unevenly or produce vibrations when idling.
- Decreased fuel efficiency: The vehicle may consume more fuel than usual.
- Engine misfires: The engine may misfire or run erratically, causing performance issues.
How to Fix P0671 2016 GMC Sierra
- Diagnose the issue: Use a diagnostic tool to pinpoint the exact cause of the fault in the cylinder 1 glow plug circuit.
- Inspect glow plug: Check the condition of the glow plug in cylinder 1 and replace it if necessary.
- Check wiring: Inspect the wiring for any damage or corrosion and repair or replace as needed.
- Test relay: Test the relay that controls the glow plug circuit to ensure it is functioning properly.
- Reset codes: After repairing the issue, clear the DTC and reset the vehicle's computer system.
Cost to Fix P0671 2016 GMC Sierra
The typical repair costs for a cylinder 1 glow plug circuit fault can range from $100 to $300, including parts and labor. However, actual costs may vary depending on the specific diagnosis time and labor rates at auto repair shops in your area. It's recommended to obtain quotes from local shops for a more accurate estimate.
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