P066F Chevrolet 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 Chevrolet 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 Chevrolet 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 Chevrolet?
- 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 Chevrolet?
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 Chevrolet 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 Chevrolet Models
- P066F 2014 Chevrolet Silverado — Cylinder 3 Glow Plug Control Circuit High Voltage
- P066F 2015 Chevrolet Silverado — Cylinder 3 Glow Plug Control Circuit High Voltage
- P066F 2016 Chevrolet Silverado — Cylinder 3 Glow Plug Control Circuit High Voltage
- P066F 2017 Chevrolet Silverado — Cylinder 3 Glow Plug Control Circuit High Voltage
- P066F 2018 Chevrolet Silverado — Cylinder 3 Glow Plug Control Circuit High Voltage
Frequently Asked Questions about P066F Chevrolet Code
1. What does the OBDII code P066F mean on a Chevrolet?
P066F indicates a high voltage issue in the glow plug control circuit for cylinder 3, often related to the diesel engine's preheating system.
2. What are the common symptoms of the P066F code in a Chevrolet?
Symptoms may include a check engine light, difficulty starting the engine, rough idling when cold, and reduced engine performance.
3. What causes the P066F code to appear in a Chevrolet?
Common causes include a faulty glow plug, wiring issues like damaged or corroded connections, a malfunctioning glow plug control module, or an ECM problem.
4. Can I drive my Chevrolet with a P066F code?
While the vehicle may still be drivable, it could experience starting problems and reduced efficiency, especially in cold weather. Prompt diagnosis and repair are recommended.
5. How do I diagnose the P066F code on a Chevrolet?
Diagnosis involves inspecting the glow plug for cylinder 3, checking the wiring and connections, testing the glow plug control module, and using a multimeter to verify voltage levels.
6. How much does it cost to fix the P066F code on a Chevrolet?
Repair costs vary but typically range from $100 to $300, depending on whether a glow plug, wiring repair, or control module replacement is needed.
7. Can a bad glow plug cause the P066F code?
Yes, a faulty or burned-out glow plug in cylinder 3 is a common cause of the P066F code.
8. How do I reset the P066F code on my Chevrolet after repairs?
After completing repairs, clear the code using an OBDII scanner. If the issue is resolved, the code should not return.
9. What happens if I ignore the P066F code in my Chevrolet?
Ignoring the code can lead to worsening engine performance, prolonged cold starts, and potential damage to the glow plug system or related components.
10. Can a malfunctioning ECM trigger the P066F code on a Chevrolet?
Yes, a faulty engine control module (ECM) can misinterpret or fail to regulate the glow plug circuit, causing the P066F code.
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