P066E GMC Code - Cylinder 3 Glow Plug Control Circuit Low Voltage
Quick Answer
The P066E diagnostic trouble code for a GMC vehicle indicates an issue with the Cylinder 3 Glow Plug Control Circuit experiencing low voltage. Common causes include Faulty glow plug in cylinder 3, Defective glow plug control module, Wiring or connection issues in the glow plug 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
- P066E GMC indicates Cylinder 3 Glow Plug Control Circuit Low Voltage.
- Common causes
- Common causes include Faulty glow plug in cylinder 3, Defective glow plug control module, Wiring or connection issues in the glow plug 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.
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Code P066E GMC Description
The P066E diagnostic trouble code for a GMC vehicle indicates an issue with the Cylinder 3 Glow Plug Control Circuit experiencing low voltage. Glow plugs are essential components in diesel engines, aiding in the ignition process by heating the combustion chamber to facilitate cold starts. When the control circuit for the glow plug in cylinder 3 is not receiving sufficient voltage, it can lead to difficulties in starting the engine, reduced performance, increased emissions, and potential long-term damage to the engine.
Common Causes of P066E GMC
- Faulty glow plug in cylinder 3
- Defective glow plug control module
- Wiring or connection issues in the glow plug circuit
- Low battery voltage affecting the glow plug operation
- Engine control module (ECM) malfunction
Symptoms of P066E GMC
- Difficulty starting the engine, especially in cold weather
- Reduced engine performance and power
- Rough idling or misfiring
- Increased emissions
- Check Engine Light illuminated on the dashboard
How to Fix P066E GMC
- Begin by diagnosing the specific cause of the low voltage in the glow plug circuit for cylinder 3 using a diagnostic scanner to retrieve the trouble codes and pinpoint the issue.
- Inspect the glow plug in cylinder 3 to determine if it is functioning correctly. Replace any faulty glow plugs as needed.
- Check the glow plug control module for any signs of damage or malfunction. Replace the module if necessary.
- Inspect the wiring and connections in the glow plug circuit for any loose connections, corrosion, or damage. Repair or replace any faulty wiring.
- Clear the trouble codes from the vehicle's ECM after completing the repairs and test the vehicle to ensure that the issue has been resolved.
Cost to Fix P066E GMC
The repair costs for addressing a P066E code on a GMC vehicle can vary depending on the specific cause of the issue and the extent of the repairs needed. On average, the parts for replacing a glow plug or glow plug control module can range from $50 to $200, while labor costs can range from $100 to $300. Overall, the total repair costs for addressing this code typically fall between $150 and $500. It is important to note that these estimates are general guidelines, and actual costs may vary based on factors such as location, vehicle make and model, and the rates of individual auto repair shops. It is recommended to obtain quotes from local shops to get a more accurate cost estimate for this repair.
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Information for Specific GMC Models
- P066E 2014 GMC Sierra — Cylinder 3 Glow Plug Control Circuit Low Voltage
- P066E 2015 GMC Sierra — Cylinder 3 Glow Plug Control Circuit Low Voltage
- P066E 2016 GMC Sierra — Cylinder 3 Glow Plug Control Circuit Low Voltage
- P066E 2017 GMC Sierra — Cylinder 3 Glow Plug Control Circuit Low Voltage
- P066E 2018 GMC Sierra — Cylinder 3 Glow Plug Control Circuit Low Voltage
Frequently Asked Questions about P066E GMC Code
What does the OBDII code P066E mean for a GMC vehicle?
The P066E code indicates a low voltage issue in the cylinder 3 glow plug control circuit on a GMC vehicle.
What are common symptoms of the P066E code in a GMC?
Symptoms may include difficulty starting the engine in cold weather, poor engine performance, or an illuminated check engine light.
What causes the P066E code on a GMC vehicle?
Common causes include a faulty glow plug, damaged wiring or connectors in the glow plug circuit, a failed glow plug control module, or corroded electrical connections.
Can the P066E code affect engine performance?
Yes, it can cause difficulties in cold starts and may lead to reduced efficiency or uneven combustion in the affected cylinder.
How is the P066E code diagnosed on a GMC?
Technicians use an OBDII scanner, inspect the glow plug and wiring for damage, and test the glow plug control circuit for proper voltage and continuity.
Can I drive my GMC with a P066E code?
While driving may be possible, it is not recommended as cold starts and engine performance may be compromised. Addressing the issue promptly is advised.
How do you fix the P066E code on a GMC vehicle?
Repairs may include replacing the faulty glow plug, repairing or replacing damaged wiring, cleaning corroded connections, or replacing the glow plug control module.
What tools are needed to troubleshoot the P066E code?
You’ll need an OBDII scanner, a multimeter to test voltage and continuity, and basic tools to access and inspect glow plugs and wiring.
Is the P066E code covered under GMC warranty?
This depends on the vehicle’s warranty terms and coverage. Glow plug issues may fall under the powertrain warranty if the vehicle is still within the coverage period.
How much does it cost to fix the P066E code on a GMC?
Repair costs can range from $100 to $400 depending on whether the glow plug, wiring, or control module requires replacement. Labor costs may vary.
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