P067B GMC Code - Cylinder 4 Glow Plug Control Circuit High Voltage
Quick Answer
n the diesel engine, air alone is compressed in the cylinder. Common causes include Faulty cylinder #4 glow plug, Cylinder #4 glow plug harness is open or shorted, Cylinder #4 glow plug circuit poor electrical connection. 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 GMC indicates Cylinder 4 Glow Plug Control Circuit High Voltage.
- Common causes
- Common causes include Faulty cylinder #4 glow plug, Cylinder #4 glow plug harness is open or shorted, Cylinder #4 glow plug circuit poor electrical connection.
- 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.
Code P067B GMC Description
Control of the glow plugs is accomplished by the Glow Plug Control Module. The nominal voltage for the glow plugs is 5.4 volts. When the ignition is turned On, the Glow Plug Control Module applies 7.2 V for 2.2 s, then 5.7 V for 0.8 s, and then 5.4 V until 1200°C (2192°F) is reached. The maximum voltage of the system is 10 V. While the engine is running the voltage will vary between 4.7 - 10 V when in closed loop control to maintain a glow plug temperature that ranges from 1150° - 1180°C (2102° - 2156°F). The temperature and the power consumption are controlled between the Engine Control Module (ECM) and the Glow Plug Control Module within a wide range to suit the engine's pre-heating requirements. Each glow plug is energized individually. This capability yields more optimum heat times for the glow plugs, thus pre - glow times can be kept to a minimum for a short wait to crank times and maximum glow plug durability.
What are the Possible Causes of the DTC P067B GMC?
- Faulty cylinder #4 glow plug
- Cylinder #4 glow plug harness is open or shorted
- Cylinder #4 glow plug circuit poor electrical connection
- Faulty Glow Plug Control Module
How to Fix the DTC P067B GMC?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P067B GMC code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
Need more information about the P067B GMC code?
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Information for Specific GMC Models
- P067B 2014 GMC Sierra — Cylinder 4 Glow Plug Control Circuit High Voltage
- P067B 2015 GMC Sierra — Cylinder 4 Glow Plug Control Circuit High Voltage
- P067B 2016 GMC Sierra — Cylinder 4 Glow Plug Control Circuit High Voltage
- P067B 2017 GMC Sierra — Cylinder 4 Glow Plug Control Circuit High Voltage
- P067B 2018 GMC Sierra — Cylinder 4 Glow Plug Control Circuit High Voltage
Frequently Asked Questions about P067B GMC Code
What does the OBDII code P067B mean for a GMC vehicle?
Code P067B indicates a high voltage condition in the glow plug control circuit for cylinder 4, meaning the system has detected an electrical issue specific to that glow plug.
What are the symptoms of a P067B code?
Symptoms may include difficulty starting the engine in cold weather, a rough idle, reduced fuel efficiency, and the check engine light being illuminated.
What causes a P067B code to be triggered?
Common causes include a faulty glow plug, damaged wiring or connectors in the circuit, a malfunctioning glow plug control module, or corrosion in the electrical connections.
Can I drive my GMC vehicle with a P067B code?
While it may still be drivable, ignoring this code can lead to harder starts, poor engine performance in cold weather, and potential further damage to the glow plug system.
How do I diagnose the P067B code?
Start by visually inspecting the glow plug and its wiring for damage or corrosion. Use a multimeter to test the resistance of the glow plug and check the voltage in the control circuit for abnormalities.
How do I fix the P067B code?
Repairs may involve replacing the faulty glow plug, repairing or replacing damaged wiring or connectors, cleaning corroded terminals, or replacing the glow plug control module if it's defective.
How much does it cost to fix a P067B code?
The cost can vary, but replacing a glow plug usually ranges between $50 and $150, while repairing wiring or replacing the control module can cost more depending on labor and parts.
Can a P067B code cause engine damage?
While the code itself doesn't directly lead to engine damage, prolonged issues with the glow plug system can cause harder starts and increased wear on the engine over time.
How can I prevent the P067B code from reoccurring?
Regular vehicle maintenance, including inspecting and cleaning electrical connections, monitoring the glow plug system, and addressing any issues promptly, can help prevent this code.
Do I need special tools to repair a P067B code?
Basic tools like a multimeter and a socket set are often sufficient for diagnosing and replacing a glow plug, but specialized tools may be needed for testing or accessing certain components.
Discuss the causes and fixes for P067B GMC OBDII Code
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