P067B 2018 GMC Sierra Code - Cylinder 4 Glow Plug Control Circuit High Voltage
Quick Answer
The diagnostic trouble code P067B for a 2018 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 or connectors in the glow plug control circuit, Malfunctioning glow plug relay. 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 2018 GMC Sierra indicates Cylinder 4 Glow Plug Control Circuit High Voltage.
- Common causes
- Common causes include Faulty glow plug in Cylinder 4, Damaged wiring or connectors in the glow plug control circuit, Malfunctioning glow plug relay.
- 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.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code P067B 2018 GMC Sierra Description
The diagnostic trouble code P067B for a 2018 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 is responsible for regulating the voltage supplied to the glow plug in Cylinder 4.
Common Causes of P067B 2018 GMC Sierra
- Faulty glow plug in Cylinder 4
- Damaged wiring or connectors in the glow plug control circuit
- Malfunctioning glow plug relay
- Issues with the engine control module (ECM)
- Corrosion or poor connections in the electrical system
Symptoms of P067B 2018 GMC Sierra
- Rough idling or engine misfires
- Difficulty starting the vehicle, especially in cold weather
- Decreased fuel efficiency
- Illumination of the check engine light
- Reduced engine performance or power output
How to Fix P067B 2018 GMC Sierra
- Begin by diagnosing the specific cause of the high voltage in Cylinder 4's glow plug control circuit using a diagnostic scanner and multimeter.
- Inspect the glow plug in Cylinder 4 for signs of damage or overheating, and replace if necessary.
- Check the wiring and connectors in the control circuit for any damage or corrosion, repairing or replacing as needed.
- Test the glow plug relay to ensure it is functioning correctly, replacing it if faulty.
- If the issue persists, consider checking the engine control module (ECM) for any faults or reprogramming if required.
Cost to Fix P067B 2018 GMC Sierra
The typical repair costs for addressing a Cylinder 4 Glow Plug Control Circuit High Voltage issue can range from $150 to $500, depending on the specific cause of the problem and the necessary repairs. This estimate includes the cost of parts such as glow plugs, wiring, connectors, and relays, as well as labor charges. It is important to note that diagnosis time and labor rates at auto repair shops can vary, so it is advisable to obtain quotes from local service providers for a more accurate estimate.
Need more information about the P067B 2018 GMC Sierra code?
Need more information on how to fix the P067B 2018 GMC Sierra code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P067B 2018 GMC Sierra code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P067B 2018 GMC Sierra Code
No Frequently Asked Questions about P067B 2018 GMC Sierra Code found.
Discuss the causes and fixes for P067B 2018 GMC Sierra OBDII Code
Code P067B 2018 GMC Sierra comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.