P066D Chevrolet Code - Cylinder 2 Glow Plug Control Circuit High Voltage
Quick Answer
The P066D code for Chevrolet vehicles specifically relates to an issue with the Cylinder 2 Glow Plug Control Circuit showing high voltage. Common causes include Faulty glow plug in cylinder 2, Malfunctioning glow plug control module, Damaged wiring or connectors in the glow plug control circuit. 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
- P066D Chevrolet indicates Cylinder 2 Glow Plug Control Circuit High Voltage.
- Common causes
- Common causes include Faulty glow plug in cylinder 2, Malfunctioning glow plug control module, Damaged wiring or connectors in the glow plug control circuit.
- 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.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code P066D Chevrolet Description
The P066D code for Chevrolet vehicles specifically relates to an issue with the Cylinder 2 Glow Plug Control Circuit showing high voltage. Glow plugs are crucial components in diesel engines, responsible for heating the combustion chamber to facilitate easier cold starts. When the engine is cold, the glow plugs heat up to ensure proper ignition of the fuel-air mixture. The control circuit regulates the voltage supplied to the glow plugs, ensuring they operate efficiently.
Common Causes of P066D Chevrolet
- Faulty glow plug in cylinder 2.
- Malfunctioning glow plug control module.
- Damaged wiring or connectors in the glow plug control circuit.
- Corrosion or poor connections in the circuit.
- Issues with the engine control module (ECM) affecting voltage regulation.
Symptoms of P066D Chevrolet
- Difficulty starting the vehicle, especially in cold weather.
- Rough idling or misfires.
- Decreased fuel efficiency.
- Illumination of the check engine light.
- Engine performance issues, such as reduced power or acceleration.
How to Fix P066D Chevrolet
- Begin by diagnosing the specific cause of the high voltage issue, using a diagnostic scanner to retrieve freeze frame data and pinpoint the exact source of the problem.
- Inspect the glow plug in cylinder 2 for signs of damage or malfunction. Replace the glow plug if necessary.
- Check the wiring and connectors in the glow plug control circuit for any damage, corrosion, or poor connections. Repair or replace as needed.
- Test the glow plug control module for proper functioning. Replace the module if it is found to be faulty.
- Clear the diagnostic trouble codes (DTCs) from the vehicle's ECM, and perform a test drive to ensure the issue has been resolved.
Cost to Fix P066D Chevrolet
The cost of repairing a Cylinder 2 Glow Plug Control Circuit High Voltage issue can vary depending on the specific cause of the problem and the labor rates in your area. On average, the parts for replacing a glow plug can range from $20 to $50, while a glow plug control module can cost between $50 and $150. Labor costs can add another $100 to $200, depending on the shop rates and the complexity of the repair. Overall, you can expect to pay anywhere from $150 to $400 for resolving this issue. Remember to factor in additional costs for diagnostic time and any other necessary repairs.
Need more information about the P066D Chevrolet code?
Need more information on how to fix the P066D Chevrolet code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P066D Chevrolet code diagnosed by a professional: Find a repair shop in your area
Information for Specific Chevrolet Models
- P066D 2014 Chevrolet Silverado — Cylinder 2 Glow Plug Control Circuit High Voltage
- P066D 2015 Chevrolet Silverado — Cylinder 2 Glow Plug Control Circuit High Voltage
- P066D 2016 Chevrolet Silverado — Cylinder 2 Glow Plug Control Circuit High Voltage
- P066D 2017 Chevrolet Silverado — Cylinder 2 Glow Plug Control Circuit High Voltage
- P066D 2018 Chevrolet Silverado — Cylinder 2 Glow Plug Control Circuit High Voltage
Frequently Asked Questions about P066D Chevrolet Code
What does the OBDII code P066D mean for a Chevrolet?
Code P066D indicates a high voltage issue in the Cylinder 2 Glow Plug Control Circuit, which is part of the system that helps start the engine in cold conditions.
What are common symptoms of code P066D in a Chevrolet?
Symptoms may include difficulty starting the engine in cold weather, a check engine light, poor engine performance, or increased emissions.
What causes the P066D code to trigger in a Chevrolet?
Common causes include a faulty glow plug, damaged wiring or connectors in the glow plug circuit, or a malfunctioning glow plug control module.
Can I drive my Chevrolet with the P066D code active?
While the vehicle may still operate, driving with this code active can lead to harder cold starts and potential long-term damage to the glow plug system.
How do I diagnose the P066D code in a Chevrolet?
Start by inspecting the wiring and connectors for Cylinder 2's glow plug, test the glow plug itself, and check the functionality of the glow plug control module.
What tools are needed to troubleshoot the P066D code?
Tools may include a multimeter for voltage testing, an OBDII scanner to read and clear codes, and potentially a test light for circuit checks.
How is the P066D code fixed in a Chevrolet?
Repairs might involve replacing the faulty glow plug, repairing or replacing damaged wiring, or replacing a defective glow plug control module.
Can a bad battery cause the P066D code in a Chevrolet?
Yes, a weak or failing battery can lead to voltage irregularities that may trigger this code, especially during cold starts.
How much does it cost to repair the P066D code in a Chevrolet?
Repair costs can vary widely, ranging from $50 to $200 for a glow plug replacement to $300 or more if a control module needs replacement.
Will clearing the P066D code with a scanner fix the issue?
Clearing the code will turn off the check engine light temporarily, but the issue will reoccur unless the underlying problem is resolved.
Discuss the causes and fixes for P066D Chevrolet OBDII Code
Code P066D Chevrolet comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.