P067C GMC Code - Cylinder 5 Glow Plug Control Circuit Low Voltage
Quick Answer
n the diesel engine, air alone is compressed in the cylinder. Common causes include Faulty cylinder #5 glow plug, Cylinder #5 glow plug harness is open or shorted, Cylinder #5 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
- P067C GMC indicates Cylinder 5 Glow Plug Control Circuit Low Voltage.
- Common causes
- Common causes include Faulty cylinder #5 glow plug, Cylinder #5 glow plug harness is open or shorted, Cylinder #5 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 P067C 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 P067C GMC?
- Faulty cylinder #5 glow plug
- Cylinder #5 glow plug harness is open or shorted
- Cylinder #5 glow plug circuit poor electrical connection
- Faulty Glow Plug Control Module
How to Fix the DTC P067C 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 P067C 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 P067C GMC code?
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Information for Specific GMC Models
- P067C 2014 GMC Sierra — Cylinder 5 Glow Plug Control Circuit Low Voltage
- P067C 2015 GMC Sierra — Cylinder 5 Glow Plug Control Circuit Low Voltage
- P067C 2016 GMC Sierra — Cylinder 5 Glow Plug Control Circuit Low Voltage
- P067C 2017 GMC Sierra — Cylinder 5 Glow Plug Control Circuit Low Voltage
- P067C 2018 GMC Sierra — Cylinder 5 Glow Plug Control Circuit Low Voltage
Frequently Asked Questions about P067C GMC Code
1. What does the OBDII code P067C mean on a GMC vehicle?
P067C indicates a low voltage issue in the glow plug control circuit for cylinder 5, which is responsible for heating the glow plug during cold starts.
2. What are the symptoms of the P067C code on a GMC?
Common symptoms include difficulty starting the engine in cold weather, reduced engine performance, and an illuminated check engine light.
3. What causes the P067C code to appear on a GMC?
Causes may include a faulty glow plug, damaged wiring or connectors in the glow plug circuit, a failing glow plug control module, or a weak vehicle battery.
4. Can I drive my GMC with the P067C code?
It’s possible to drive, but prolonged operation may lead to hard starts, especially in cold weather, and could cause further damage to the engine or electrical system.
5. How can I diagnose the P067C code on my GMC?
Diagnose by visually inspecting the wiring and connectors for cylinder 5, testing the glow plug with a multimeter, and checking the glow plug control module for proper operation.
6. How do I fix the P067C code on a GMC?
Repairs may involve replacing the faulty glow plug, repairing damaged wiring, cleaning or tightening connectors, or replacing the glow plug control module if necessary.
7. How much does it cost to fix the P067C code on a GMC?
Repair costs can range from $50 to $200 for a glow plug replacement, while more extensive repairs like fixing wiring or replacing the control module may cost $300 or more.
8. Can a weak battery cause the P067C code?
Yes, a weak or failing battery can lead to insufficient voltage to the glow plug circuit, triggering the P067C code.
9. How can I prevent the P067C code from recurring on my GMC?
Regularly inspect and maintain the glow plug system, ensure wiring and connectors are in good condition, and keep the battery fully charged and in good health.
10. Is the P067C code specific to GMC vehicles?
No, while P067C is commonly seen on GMC vehicles with diesel engines, it can appear on other makes and models with similar systems.
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