P067B 2016 GMC Sierra Code - Cylinder 4 Glow Plug Control Circuit High Voltage
Quick Answer
The diagnostic trouble code P067B for a 2016 GMC Sierra indicates an issue with the Cylinder 4 Glow Plug Control Circuit High Voltage. Common causes include Faulty glow plug in Cylinder 4, Damaged wiring harness connecting to the glow plug, Malfunctioning glow plug control module. 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 2016 GMC Sierra indicates Cylinder 4 Glow Plug Control Circuit High Voltage.
- Common causes
- Common causes include Faulty glow plug in Cylinder 4, Damaged wiring harness connecting to the glow plug, Malfunctioning glow plug control module.
- 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 2016 GMC Sierra Description
The diagnostic trouble code P067B for a 2016 GMC Sierra indicates an issue with the Cylinder 4 Glow Plug Control Circuit High Voltage. Glow plugs are essential components in diesel engines, as they heat the combustion chamber to facilitate cold starts. When the engine is cold, the glow plugs heat up to ensure proper ignition of the fuel-air mixture. The control circuit for the glow plug in Cylinder 4 is registering a high voltage, which can lead to various performance issues in the vehicle.
Common Causes of P067B 2016 GMC Sierra
- Faulty glow plug in Cylinder 4.
- Damaged wiring harness connecting to the glow plug.
- Malfunctioning glow plug control module.
- Issue with the engine control module (ECM).
- Corrosion or poor connections in the glow plug circuit.
Symptoms of P067B 2016 GMC Sierra
- Difficulty starting the engine, especially in cold weather.
- Rough idling or misfires.
- Decreased fuel efficiency.
- Illumination of the check engine light.
- Increased emissions.
How to Fix P067B 2016 GMC Sierra
- Begin by diagnosing the specific cause of the high voltage in the Cylinder 4 glow plug control circuit using a diagnostic scanner.
- Inspect the glow plug in Cylinder 4 for any signs of damage or malfunction and replace if necessary.
- Check the wiring harness for any breaks, fraying, or corrosion, and repair or replace as needed.
- Test the glow plug control module and ECM for proper functioning and replace if found to be faulty.
- Clear the diagnostic trouble code from the vehicle's system and test the vehicle to ensure the issue has been resolved.
Cost to Fix P067B 2016 GMC Sierra
The typical repair costs for addressing a Cylinder 4 Glow Plug Control Circuit High Voltage issue in a 2016 GMC Sierra can range from $200 to $500, including parts and labor. However, the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's advisable to check local rates for a more precise estimate. Keep in mind that rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less.
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