P067B 2014 GMC Sierra Code - Cylinder 4 Glow Plug Control Circuit High Voltage
Quick Answer
The P067B diagnostic trouble code (DTC) for a 2014 GMC Sierra indicates a problem with the cylinder 4 glow plug control circuit having high voltage. Common causes include Faulty glow plug: A defective glow plug in cylinder 4 can cause the high voltage in the control circuit, Glow plug relay failure: A malfunctioning glow plug relay can result in excessive voltage in the circuit, Wiring issues: Corrosion, damage, or poor connections in the wiring harness can lead to high voltage in the glow plug control circuit. 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
- P067B 2014 GMC Sierra indicates Cylinder 4 Glow Plug Control Circuit High Voltage.
- Common causes
- Common causes include Faulty glow plug: A defective glow plug in cylinder 4 can cause the high voltage in the control circuit, Glow plug relay failure: A malfunctioning glow plug relay can result in excessive voltage in the circuit, Wiring issues: Corrosion, damage, or poor connections in the wiring harness can lead to high voltage in the glow plug control circuit.
- 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 P067B 2014 GMC Sierra Description
The P067B diagnostic trouble code (DTC) for a 2014 GMC Sierra indicates a problem with the cylinder 4 glow plug control circuit having high voltage. Glow plugs are essential components in diesel engines that help in starting the engine by heating the air in the combustion chamber before ignition. When the PCM (Powertrain Control Module) detects that the voltage in the cylinder 4 glow plug control circuit is higher than the specified range, it triggers this code. This issue can lead to difficulties in starting the engine, reduced fuel efficiency, and even engine misfires.
Common Causes of P067B 2014 GMC Sierra
- Faulty glow plug: A defective glow plug in cylinder 4 can cause the high voltage in the control circuit.
- Glow plug relay failure: A malfunctioning glow plug relay can result in excessive voltage in the circuit.
- Wiring issues: Corrosion, damage, or poor connections in the wiring harness can lead to high voltage in the glow plug control circuit.
- PCM malfunction: A problem with the Powertrain Control Module can also cause the high voltage issue in the cylinder 4 glow plug control circuit.
- Environmental factors: Exposure to extreme temperatures or moisture can lead to electrical issues in the glow plug system.
Symptoms of P067B 2014 GMC Sierra
- Hard starting: Difficulty starting the engine, especially in cold weather, can be a sign of a faulty glow plug in cylinder 4.
- Rough idling: The engine may run erratically or have a rough idle due to the cylinder 4 glow plug issue.
- Engine misfires: Misfires during acceleration or while driving can occur when the glow plug control circuit is not functioning correctly.
- Decreased fuel efficiency: A malfunctioning glow plug can lead to incomplete combustion, causing a decrease in fuel efficiency.
- Illuminated check engine light: The PCM will trigger the check engine light to alert the driver of the issue with the glow plug control circuit.
How to Fix P067B 2014 GMC Sierra
- Diagnostic scan: Use a diagnostic scan tool to read the DTC and pinpoint the exact cause of the high voltage in the cylinder 4 glow plug control circuit.
- Test glow plugs: Check the resistance of the glow plug in cylinder 4 to determine if it is faulty and needs replacement.
- Inspect wiring: Thoroughly inspect the wiring harness for any damage, corrosion, or loose connections that could be causing the high voltage issue.
- Replace glow plug relay: If the glow plug relay is found to be faulty, replace it with a new one to ensure proper voltage regulation in the circuit.
- Clear DTC: After making the necessary repairs, clear the DTC and test the vehicle to ensure that the issue has been resolved.
Cost to Fix P067B 2014 GMC Sierra
The cost of repairing a cylinder 4 glow plug control circuit high voltage issue in a 2014 GMC Sierra can vary depending on the exact cause of the problem. Typically, the cost of replacing a glow plug relay can range from $50 to $150, while replacing a glow plug can cost between $20 to $50 per plug. The total repair cost, including parts and labor, can range from $150 to $400. However, it's important to note that labor rates at auto repair shops can vary, and additional diagnostic time may be needed to pinpoint the exact cause of the issue. It's advisable to consult with a professional mechanic for a more accurate cost estimate based on your specific vehicle and location.
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