P066F 2014 Chevrolet Silverado Code - Cylinder 3 Glow Plug Control Circuit High Voltage
Quick Answer
n the diesel engine, air alone is compressed in the cylinder. Common causes include Faulty cylinder #3 glow plug, Cylinder #3 glow plug harness is open or shorted, Cylinder #3 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
- P066F 2014 Chevrolet Silverado indicates Cylinder 3 Glow Plug Control Circuit High Voltage.
- Common causes
- Common causes include Faulty cylinder #3 glow plug, Cylinder #3 glow plug harness is open or shorted, Cylinder #3 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 P066F 2014 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 P066F 2014 Chevrolet Silverado?
- Faulty cylinder #3 glow plug
- Cylinder #3 glow plug harness is open or shorted
- Cylinder #3 glow plug circuit poor electrical connection
- Faulty Glow Plug Control Module
How to Fix the DTC P066F 2014 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 P066F 2014 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 P066F 2014 Chevrolet Silverado Code
What does the OBDII code P066F mean on a 2014 Chevrolet Silverado?
P066F indicates a high voltage issue in the glow plug control circuit for cylinder 3, which is part of the diesel engine's pre-heating system.
What are the symptoms of code P066F in a 2014 Chevy Silverado?
Common symptoms include difficulty starting the engine in cold weather, reduced engine performance, and the illumination of the check engine light.
What causes the P066F code to appear?
Possible causes include a faulty glow plug, damaged wiring or connectors in the glow plug circuit, a malfunctioning glow plug control module, or high resistance in the circuit.
Can I drive my 2014 Silverado with the P066F code?
While you may still be able to drive, prolonged operation with this code can lead to starting issues, especially in cold weather, and potential damage to engine components.
How do I diagnose the P066F code?
Use an OBDII scanner to confirm the code, inspect the glow plug and its wiring for damage, and test for proper voltage and resistance in the cylinder 3 glow plug circuit.
How do you fix the P066F code on a 2014 Chevy Silverado?
Repairs may include replacing the cylinder 3 glow plug, repairing damaged wiring or connectors, or replacing the glow plug control module if it’s defective.
How much does it cost to fix the P066F code?
The repair cost can range from $100 to $300, depending on whether the issue is a faulty glow plug, damaged wiring, or a malfunctioning control module.
Can a bad glow plug cause permanent engine damage?
While a bad glow plug itself won’t directly damage the engine, prolonged starting issues and incomplete combustion can lead to wear on other engine components over time.
How can I prevent the P066F code from occurring again?
Regular maintenance, including inspecting glow plugs and their wiring, can help prevent this issue. Use quality parts when replacing glow plugs.
Is it necessary to replace all glow plugs if one fails?
It’s not required, but replacing all glow plugs together can save labor costs and ensure consistent performance, especially if they are near the end of their lifespan.
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