P067F GMC Code - Cylinder 6 Glow Plug Control Circuit High Voltage
Quick Answer
n the diesel engine, air alone is compressed in the cylinder. Common causes include Faulty cylinder #6 glow plug, Cylinder #6 glow plug harness is open or shorted, Cylinder #6 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
- P067F GMC indicates Cylinder 6 Glow Plug Control Circuit High Voltage.
- Common causes
- Common causes include Faulty cylinder #6 glow plug, Cylinder #6 glow plug harness is open or shorted, Cylinder #6 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 P067F 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 P067F GMC?
- Faulty cylinder #6 glow plug
- Cylinder #6 glow plug harness is open or shorted
- Cylinder #6 glow plug circuit poor electrical connection
- Faulty Glow Plug Control Module
How to Fix the DTC P067F 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 P067F 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 P067F GMC code?
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Need Help with the Code?
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Information for Specific GMC Models
- P067F 2014 GMC Sierra — Cylinder 6 Glow Plug Control Circuit High Voltage
- P067F 2015 GMC Sierra — Cylinder 6 Glow Plug Control Circuit High Voltage
- P067F 2016 GMC Sierra — Cylinder 6 Glow Plug Control Circuit High Voltage
- P067F 2017 GMC Sierra — Cylinder 6 Glow Plug Control Circuit High Voltage
- P067F 2018 GMC Sierra — Cylinder 6 Glow Plug Control Circuit High Voltage
Frequently Asked Questions about P067F GMC Code
1. What does the OBDII code P067F mean on a GMC?
P067F indicates a high voltage issue in the Cylinder 6 Glow Plug Control Circuit, which may affect the glow plug's ability to preheat the cylinder for cold starts.
2. What are the common symptoms of code P067F on a GMC?
Symptoms can include difficulty starting in cold weather, a rough idle during cold starts, reduced engine performance, and the check engine light being illuminated.
3. What causes the P067F code on a GMC?
Common causes include a faulty glow plug, damaged wiring or connectors in the glow plug circuit, a malfunctioning glow plug control module, or corrosion in the electrical connections.
4. Can I drive my GMC with the P067F code active?
While it may be possible to drive the vehicle, cold starts could become more difficult, and prolonged driving without repairs may lead to further engine or electrical issues.
5. How do I diagnose the P067F code on my GMC?
Diagnosis typically involves inspecting the wiring and connectors for damage, testing the glow plug for Cylinder 6, and checking the voltage output of the glow plug control module.
6. How do I fix the P067F code on a GMC?
Repairs may include replacing the faulty glow plug, repairing or replacing damaged wiring or connectors, or replacing the glow plug control module if it’s determined to be defective.
7. How much does it cost to fix the P067F code on a GMC?
Costs vary depending on the exact issue, but replacing a glow plug typically costs $100–$300, while control module repairs or replacements may run higher.
8. Is the P067F code specific to GMC vehicles?
No, the code can appear on other diesel vehicles, but the exact diagnosis and repair steps may vary depending on the make and model.
9. Can a bad glow plug cause long-term damage if the P067F code is ignored?
Ignoring a bad glow plug may lead to starting issues and increased wear on the engine, especially in cold climates where proper preheating is critical.
10. What tools do I need to troubleshoot the P067F code on a GMC?
You’ll need an OBDII scanner to read and clear codes, a multimeter to test voltage and resistance, and possibly a service manual for your specific vehicle model.
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