P067E GMC Code - Cylinder 6 Glow Plug Control Circuit Low 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
- P067E GMC indicates Cylinder 6 Glow Plug Control Circuit Low 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 P067E 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 P067E 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 P067E 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 P067E 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
- P067E 2014 GMC Sierra — Cylinder 6 Glow Plug Control Circuit Low Voltage
- P067E 2015 GMC Sierra — Cylinder 6 Glow Plug Control Circuit Low Voltage
- P067E 2016 GMC Sierra — Cylinder 6 Glow Plug Control Circuit Low Voltage
- P067E 2017 GMC Sierra — Cylinder 6 Glow Plug Control Circuit Low Voltage
- P067E 2018 GMC Sierra — Cylinder 6 Glow Plug Control Circuit Low Voltage
Frequently Asked Questions about P067E GMC Code
1. What does the OBDII code P067E mean on a GMC?
It indicates a low voltage issue in the glow plug control circuit for cylinder 6, which may affect engine starting and performance in cold conditions.
2. What are the common symptoms of code P067E on a GMC?
Symptoms include difficulty starting the engine in cold weather, reduced fuel efficiency, rough idling, and an illuminated Check Engine Light.
3. What causes the P067E code to appear 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 corroded electrical connections.
4. Can I drive my GMC with the P067E code active?
Driving is usually possible, but it may be harder to start the engine in cold weather, and ignoring the issue could lead to further engine or electrical problems.
5. How do I diagnose the P067E code on my GMC?
Diagnosis involves checking the glow plug for cylinder 6, inspecting wiring and connectors for damage or corrosion, and testing the glow plug control module.
6. How do I fix the P067E code on a GMC?
Common fixes include replacing the faulty glow plug, repairing or replacing damaged wiring, cleaning corroded connectors, or replacing the glow plug control module if necessary.
7. How much does it cost to repair the P067E code on a GMC?
The cost ranges from $50 to $150 for a glow plug replacement, while repairs involving wiring or the control module may cost more depending on labor rates and parts.
8. Can a bad battery cause the P067E code on a GMC?
Yes, a weak or failing battery can contribute to low voltage issues in the glow plug circuit and trigger the P067E code.
9. Does the P067E code only affect diesel engines on GMC vehicles?
Yes, the P067E code is specific to diesel engines because they use glow plugs to assist with cold starts.
10. Will clearing the P067E code fix the problem?
Clearing the code may turn off the Check Engine Light temporarily, but the underlying issue must be fixed to prevent the code from returning.
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