P066F 2015 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 2015 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 2015 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 2015 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 2015 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 2015 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 2015 Chevrolet Silverado Code
1. What does the OBDII code P066F mean on a 2015 Chevrolet Silverado?
P066F indicates a high voltage issue in the Cylinder 3 Glow Plug Control Circuit, typically related to the glow plug or its control system.
2. What are the symptoms of P066F in a 2015 Chevrolet Silverado?
Symptoms may include difficulty starting the engine in cold weather, poor performance, a check engine light, and possible rough idling.
3. What causes the P066F code to appear?
Common causes include a faulty glow plug, damaged wiring or connectors, a malfunctioning glow plug control module, or a short circuit in the control circuit.
4. Can I drive my 2015 Silverado with a P066F code active?
While the truck may still run, driving with this code active can lead to poor cold-weather performance and potentially damage other components if not addressed promptly.
5. How do I diagnose the P066F code on my Silverado?
Start by inspecting the Cylinder 3 glow plug, wiring, and connectors for damage. Then test the glow plug and control module for proper function using a multimeter or diagnostic tool.
6. How can I fix the P066F code on a 2015 Chevy Silverado?
Repairs may include replacing the faulty glow plug, repairing damaged wiring, cleaning or replacing corroded connectors, or replacing the glow plug control module if necessary.
7. How much does it cost to repair the P066F code on a Silverado?
The cost varies depending on the issue, but replacing a glow plug typically costs $50–$150 for parts and labor, while control module repairs may cost $200–$500.
8. Can a bad battery cause the P066F code to appear?
Yes, a weak or failing battery can cause voltage irregularities, potentially triggering this code in the glow plug control circuit.
9. Do I need special tools to fix the P066F code?
Basic tools like a multimeter and OBDII scanner are often sufficient for diagnosis, but specialized tools may be required for glow plug removal or control module testing.
10. What could happen if I ignore the P066F code on my Silverado?
Ignoring the code could lead to starting issues in cold weather, reduced engine efficiency, and potential damage to the glow plug system or related components over time.
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