P066F 2017 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 2017 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 2017 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 2017 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 2017 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 2017 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 2017 Chevrolet Silverado Code
1. What does the OBDII code P066F mean for a 2017 Chevrolet Silverado?
The code P066F indicates a high voltage issue in the Cylinder 3 Glow Plug Control Circuit, meaning the circuit is experiencing a voltage level outside of its normal range.
2. What are the common symptoms of code P066F in a 2017 Chevrolet Silverado?
Symptoms may include difficulty starting the engine in cold weather, reduced engine performance, a check engine light, or rough idling.
3. What causes the P066F code to appear on a 2017 Chevrolet Silverado?
Common causes include a faulty glow plug, damaged wiring or connectors in the glow plug circuit, a malfunctioning glow plug control module, or corrosion in the electrical connections.
4. Can I still drive my 2017 Chevrolet Silverado with a P066F code?
While the truck may still run, it could experience starting issues in colder temperatures, reduced efficiency, and potential long-term damage to the engine if not addressed promptly.
5. How do I diagnose the P066F code on a 2017 Chevrolet Silverado?
Diagnosis involves inspecting the glow plug for Cylinder 3, checking the wiring and connectors for damage, testing the glow plug control module, and measuring the circuit voltage with a multimeter.
6. How do I fix the P066F code on a 2017 Chevrolet Silverado?
Repairs may include replacing the faulty glow plug, repairing or replacing damaged wires or connectors, cleaning corroded connections, or replacing the glow plug control module if necessary.
7. How much does it cost to fix the P066F code on a 2017 Chevrolet Silverado?
The repair cost depends on the issue, ranging from $100-$300 for glow plug replacement to $500 or more if the glow plug control module needs replacement.
8. Can a dirty or corroded connection cause the P066F code on my 2017 Chevrolet Silverado?
Yes, dirty or corroded connections can disrupt voltage flow and cause the glow plug control circuit to register a high voltage.
9. Does the P066F code affect fuel efficiency in a 2017 Chevrolet Silverado?
Yes, a malfunctioning glow plug system can lead to inefficient combustion, potentially reducing fuel efficiency.
10. Will clearing the P066F code with a scanner fix my 2017 Chevrolet Silverado?
Clearing the code may turn off the check engine light temporarily, but if the underlying issue isn’t resolved, the code will reappear.
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