P066A 2018 Chevrolet Silverado Code - Cylinder 1 Glow Plug Control Circuit Low Voltage
Quick Answer
n the diesel engine, air alone is compressed in the cylinder. Common causes include Faulty cylinder #1 glow plug, Cylinder #1 glow plug harness is open or shorted, Cylinder #1 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
- P066A 2018 Chevrolet Silverado indicates Cylinder 1 Glow Plug Control Circuit Low Voltage.
- Common causes
- Common causes include Faulty cylinder #1 glow plug, Cylinder #1 glow plug harness is open or shorted, Cylinder #1 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 P066A 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 P066A 2018 Chevrolet Silverado?
- Faulty cylinder #1 glow plug
- Cylinder #1 glow plug harness is open or shorted
- Cylinder #1 glow plug circuit poor electrical connection
- Faulty Glow Plug Control Module
How to Fix the DTC P066A 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 P066A 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 P066A 2018 Chevrolet Silverado Code
What does the OBDII code P066A mean for a 2018 Chevrolet Silverado?
P066A indicates a low voltage issue in the glow plug control circuit for cylinder 1, which can affect the engine's ability to start and run efficiently in cold conditions.
What are the symptoms of code P066A in a 2018 Chevrolet Silverado?
Common symptoms include difficulty starting in cold weather, reduced engine performance, a check engine light, and potentially increased emissions.
What causes the P066A code to appear in a 2018 Chevrolet Silverado?
Possible causes include a faulty glow plug, damaged wiring or connectors in the glow plug circuit, a malfunctioning glow plug control module, or a low battery voltage.
Can I drive my 2018 Chevrolet Silverado with a P066A code?
Driving is possible but not recommended, especially in cold weather, as the engine may have difficulty starting or running efficiently. Prompt diagnosis and repair are advised.
How do I diagnose the P066A code in my 2018 Chevrolet Silverado?
Start by inspecting the glow plug and its wiring for damage or corrosion. Use a multimeter to check the circuit's voltage and test the functionality of the glow plug and control module.
How much does it cost to fix the P066A code on a 2018 Chevrolet Silverado?
Repair costs can vary but typically range from $150 to $400, depending on whether the glow plug, wiring, or control module needs to be replaced.
Can a weak battery trigger the P066A code?
Yes, a weak or failing battery can cause low voltage in the glow plug control circuit, potentially triggering the P066A code.
How can I prevent the P066A code from occurring again?
Regularly inspect and maintain the glow plug system, ensure all electrical connections are clean and secure, and keep the battery in good condition.
Will clearing the P066A code fix the issue in my 2018 Chevrolet Silverado?
Clearing the code will turn off the check engine light, but it won’t fix the underlying issue. The problem must be diagnosed and repaired to prevent the code from returning.
Do I need a professional to fix the P066A code on my 2018 Chevrolet Silverado?
While basic diagnostics like visual inspections can be done at home, repairing the issue, especially if it involves wiring or the control module, may require professional expertise.
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