P0384 Code - Glow Plug Control Module Circuit High
Quick Answer
The diagnostic trouble code P0384 indicates that there is a malfunction in the glow plug control module circuit, specifically that the circuit is registering a high voltage. Common causes include Damaged wiring or connectors in the glow plug control circuit, Faulty glow plug control module, Malfunctioning glow plug relay. 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
- P0384 indicates Glow Plug Control Module Circuit High.
- Common causes
- Common causes include Damaged wiring or connectors in the glow plug control circuit, Faulty glow plug control module, Malfunctioning glow plug relay.
- 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 P0384 Description
The diagnostic trouble code P0384 indicates that there is a malfunction in the glow plug control module circuit, specifically that the circuit is registering a high voltage. The glow plug control module is responsible for controlling the operation of the glow plugs in a diesel engine. Glow plugs are essential components that heat up the combustion chamber to facilitate cold starts in diesel engines. When the control module circuit registers a high voltage, it means that there is an issue with the electrical system that controls the glow plugs.
Common Causes of P0384
- Damaged wiring or connectors in the glow plug control circuit.
- Faulty glow plug control module.
- Malfunctioning glow plug relay.
- Problem with the power supply to the glow plug system.
Symptoms of P0384
- Difficulty starting the engine, especially in cold weather.
- Rough idling or misfiring.
- Decreased fuel efficiency.
- Increased emissions.
- Check Engine Light illuminated on the dashboard.
How to Fix P0384
- Begin by conducting a visual inspection of the glow plug control module circuit, checking for any visible damage to wiring or connectors.
- Test the glow plug control module using a multimeter to determine if it is functioning correctly.
- Check the glow plug relay for proper operation and replace if necessary.
- Verify the power supply to the glow plug system and address any issues with the battery or alternator.
- Clear the diagnostic trouble codes and test the vehicle to ensure that the issue has been resolved.
Cost to Fix P0384
The typical repair costs for addressing a glow plug control module circuit high issue can range from $200 to $500, including parts and labor. However, it's important to note that specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Auto repair shops commonly charge between $80 and $150 per hour for labor, but rates may be higher in metropolitan areas or at dealerships and lower at independent shops. It's recommended to check local rates for a more accurate estimate.
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