P067A 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado?
- 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 2018 Chevrolet Silverado?
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 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado Code
What does OBDII code P067A mean on a 2018 Chevrolet Silverado?
P067A indicates a low voltage condition in the glow plug control circuit for cylinder 4, which can affect the engine's cold-start performance.
What are the symptoms of code P067A in a 2018 Chevrolet Silverado?
Common symptoms include difficulty starting in cold weather, a check engine light, rough idle, and increased exhaust smoke during startup.
What causes the P067A code in a 2018 Chevrolet Silverado?
Possible causes include a faulty cylinder 4 glow plug, damaged wiring or connectors in the glow plug circuit, a malfunctioning glow plug control module, or corrosion at electrical connections.
Can I drive my 2018 Chevrolet Silverado with the P067A code active?
While the truck may still run, driving with this code can lead to poor cold starts, reduced fuel efficiency, and potential long-term engine damage if not addressed promptly.
How do I diagnose the P067A code on my 2018 Chevrolet Silverado?
Start by inspecting the cylinder 4 glow plug, its wiring, and connectors for damage or corrosion. Use a multimeter to test the glow plug's resistance and check voltage at the glow plug control module.
How do I fix code P067A on a 2018 Chevrolet Silverado?
Repairs may include replacing the cylinder 4 glow plug, repairing or replacing damaged wiring or connectors, or replacing the glow plug control module if it’s faulty.
How much does it cost to fix the P067A code on a 2018 Chevrolet Silverado?
The cost varies depending on the issue, but replacing a glow plug typically costs $100-$250, while a glow plug control module replacement may cost $300-$500, including labor.
Can a bad battery cause the P067A code in a 2018 Chevrolet Silverado?
Yes, a weak or failing battery can cause low voltage in the glow plug circuit, potentially triggering the P067A code.
How can I prevent the P067A code from recurring on my Silverado?
Regularly inspect and maintain the glow plug system, check for corrosion or damaged wiring, and ensure the battery and charging system are in good condition.
Will clearing the P067A code fix the issue on a 2018 Chevrolet Silverado?
Clearing the code may temporarily turn off the check engine light, but the underlying issue must be repaired to prevent the code from returning.
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