P067A 2016 GMC Sierra 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 2016 GMC Sierra 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 2016 GMC Sierra 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 2016 GMC Sierra?
- 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 2016 GMC Sierra?
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 2016 GMC Sierra 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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Frequently Asked Questions about P067A 2016 GMC Sierra Code
What does the OBDII code P067A mean for a 2016 GMC Sierra?
P067A indicates that the glow plug control circuit for cylinder 4 is experiencing low voltage, which may impact engine start performance in cold conditions.
What are the common symptoms of code P067A on a 2016 GMC Sierra?
Common symptoms include difficulty starting the engine in cold weather, rough idling, reduced fuel efficiency, and a possible illuminated check engine light.
What causes the P067A code on a 2016 GMC Sierra?
Causes may include a faulty glow plug, damaged wiring, poor electrical connections, or a malfunctioning glow plug control module.
How do I diagnose the P067A code on my 2016 GMC Sierra?
Start by inspecting the glow plug for cylinder 4, checking wiring and connectors for damage or corrosion, and testing the glow plug control module with a multimeter.
Can I drive my 2016 GMC Sierra with the P067A code active?
While the truck may still run, driving with this code active can lead to hard cold starts and potential damage to other components over time.
How do I fix the P067A code on a 2016 GMC Sierra?
Repairs may involve replacing the cylinder 4 glow plug, repairing or replacing damaged wiring/connectors, or replacing the glow plug control module if faulty.
How much does it cost to fix the P067A code on a 2016 GMC Sierra?
Repair costs vary depending on the specific issue, but glow plug replacement typically costs $100-$300, while control module replacement could cost $300-$600.
Can a failing glow plug cause engine damage on my 2016 GMC Sierra?
While a single failing glow plug typically won't cause significant damage, prolonged issues can lead to harder starts and strain other engine components.
How can I prevent the P067A code from occurring on my 2016 GMC Sierra?
Regular maintenance, including inspecting glow plugs and electrical connections, can help prevent this code from appearing.
Do I need a professional to fix the P067A code on my 2016 GMC Sierra?
If you're experienced with automotive repairs, you may be able to fix it yourself. However, complex electrical diagnostics may require professional assistance.
Discuss the causes and fixes for P067A 2016 GMC Sierra OBDII Code
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