P067A GMC Code - Cylinder 4 Glow Plug Control Circuit Low 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
- P067A GMC indicates Cylinder 4 Glow Plug Control Circuit Low 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 P067A 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 P067A 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 P067A 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 P067A 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.
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Information for Specific GMC Models
- P067A 2014 GMC Sierra — Cylinder 4 Glow Plug Control Circuit Low Voltage
- P067A 2015 GMC Sierra — Cylinder 4 Glow Plug Control Circuit Low Voltage
- P067A 2016 GMC Sierra — Cylinder 4 Glow Plug Control Circuit Low Voltage
- P067A 2017 GMC Sierra — Cylinder 4 Glow Plug Control Circuit Low Voltage
- P067A 2018 GMC Sierra — Cylinder 4 Glow Plug Control Circuit Low Voltage
Frequently Asked Questions about P067A GMC Code
1. What does the OBDII code P067A mean on a GMC vehicle?
P067A indicates a low voltage issue in the glow plug control circuit for cylinder 4, which affects the operation of the glow plug in that cylinder.
2. What are the symptoms of code P067A in a GMC?
Common symptoms include hard starting in cold weather, rough idling, reduced engine performance, and the illumination of the check engine light.
3. What causes the P067A code on a GMC?
Causes can include a faulty glow plug, damaged glow plug wiring, a defective glow plug control module, or corrosion at electrical connectors.
4. Can I drive my GMC with the P067A code active?
While the vehicle may still be drivable, prolonged operation with this code can lead to starting difficulties and further damage to the glow plug system.
5. How do I diagnose the P067A code on a GMC?
Diagnosis involves inspecting the glow plug for cylinder 4, testing the wiring and connectors for damage or corrosion, and checking the glow plug control module for proper operation.
6. How do I fix the P067A code on a GMC?
Repairs may include replacing the faulty glow plug, repairing damaged wiring, cleaning corroded connectors, or replacing the glow plug control module if necessary.
7. What tools are needed to fix the P067A code on a GMC?
Common tools include a digital multimeter for voltage testing, a scan tool to clear the code, and basic hand tools to remove and replace components.
8. How much does it cost to fix the P067A code on a GMC?
Repair costs can range from $50 to $200 for parts and labor, depending on whether the glow plug or control module needs replacement.
9. Can a weak battery cause the P067A code on a GMC?
Yes, a weak or failing battery can cause insufficient voltage to the glow plug system and trigger the P067A code.
10. How can I prevent the P067A code from occurring on my GMC?
Regular maintenance, including inspecting the glow plug system, cleaning electrical connections, and ensuring the battery is in good condition, can help prevent this code.
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