P066E 2015 GMC Sierra Code - Cylinder 3 Glow Plug Control Circuit Low Voltage
Quick Answer
The P066E diagnostic trouble code (DTC) indicates a low voltage condition in the glow plug control circuit for cylinder 3 of a 2015 GMC Sierra. Common causes include Faulty glow plug for cylinder 3, Damaged or corroded wiring in the glow plug control circuit, Malfunctioning glow plug relay or control module. 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
- P066E 2015 GMC Sierra indicates Cylinder 3 Glow Plug Control Circuit Low Voltage.
- Common causes
- Common causes include Faulty glow plug for cylinder 3, Damaged or corroded wiring in the glow plug control circuit, Malfunctioning glow plug relay or control module.
- 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.
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Code P066E 2015 GMC Sierra Description
The P066E diagnostic trouble code (DTC) indicates a low voltage condition in the glow plug control circuit for cylinder 3 of a 2015 GMC Sierra. Glow plugs are crucial components in diesel engines, designed to preheat the combustion chamber to facilitate easier starting, especially in cold weather. When the glow plug control circuit registers a low voltage, it suggests that the glow plug for cylinder 3 is not receiving the necessary electrical current to operate effectively.
Common Causes of P066E 2015 GMC Sierra
- Faulty glow plug for cylinder 3.
- Damaged or corroded wiring in the glow plug control circuit.
- Malfunctioning glow plug relay or control module.
- Poor electrical connections or grounding issues.
- Issues with the engine control module (ECM) that affect the glow plug operation.
Symptoms of P066E 2015 GMC Sierra
- Difficulty starting the engine, especially in cold weather.
- Rough idling or misfiring of the engine.
- Increased exhaust smoke, particularly white smoke during startup.
- Illuminated check engine light on the dashboard.
- Decreased fuel efficiency due to incomplete combustion.
How to Fix P066E 2015 GMC Sierra
- Diagnostic Testing: Begin by using an OBD-II scanner to confirm the P066E code and check for any additional codes that may provide more context.
- Visual Inspection: Inspect the wiring and connectors associated with the glow plug control circuit for signs of damage, corrosion, or loose connections.
- Test Glow Plug: Remove the glow plug for cylinder 3 and test it with a multimeter to check for proper resistance. Replace if it is found to be faulty.
- Check Relay and Circuit: Test the glow plug relay and associated circuits for proper voltage and functionality. Replace any faulty components.
- Clear Codes and Test Drive: After repairs, clear the DTCs from the ECM and perform a test drive to ensure that the issue has been resolved and that the check engine light does not reappear.
Cost to Fix P066E 2015 GMC Sierra
** Repair costs for addressing a P066E code can vary widely based on several factors, including the specific diagnosis, parts needed, and labor rates in your area. Typically, the cost for parts (such as glow plugs, relays, or wiring) may range from $50 to $300. Labor costs can range from $80 to $150 per hour, depending on the shop's location and reputation.
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