P066D – BMW DTC

BMW DTC P066D – Cylinder 2 Glow Plug Control Circuit High

DTC P066D meaning on BMW

DTC P066D is a diagnostic trouble code that indicates an issue with the Cylinder 2 Glow Plug Control Circuit on a BMW vehicle. The code specifically points to a high voltage condition in the control circuit of the glow plug for cylinder 2.

BMW DTC P066D symptoms

Symptoms of DTC P066D on a BMW may include:

• Check Engine Light illuminated
• Engine misfires
• Reduced engine performance
• Difficulty starting the engine, especially in cold conditions

BMW DTC P066D causes

Common causes of DTC P066D on a BMW include:

• Faulty glow plug for cylinder 2
• Wiring or connector issues in the glow plug control circuit
• Defective glow plug control module
• Software issues in the engine control module

BMW DTC P066D seriousness

While DTC P066D may not cause immediate drivability issues, it is important to address this code promptly to prevent potential engine damage and ensure optimal performance of the vehicle.

How to diagnose DTC P066D on BMW

To diagnose DTC P066D on a BMW, you can follow these steps:

1. Use a diagnostic scanner to retrieve the fault codes stored in the engine control module.
2. Inspect the glow plug for cylinder 2 and its wiring for any visible damage or corrosion.
3. Test the glow plug resistance and check for proper voltage supply to the glow plug.
4. Check the glow plug control module for any faults.

How to fix DTC P066D on BMW

To fix DTC P066D on a BMW, you can consider the following actions:

1. Replace the faulty glow plug for cylinder 2.
2. Repair or replace any damaged wiring or connectors in the glow plug control circuit.
3. If the glow plug control module is defective, replace it with a new one.
4. Update the engine control module software if necessary.

How to erase DTC P066D on BMW

To erase DTC P066D on a BMW, you can clear the fault codes using a diagnostic scanner that has the capability to reset codes. Once the codes are cleared, you can drive the vehicle and monitor for any recurrence of the fault code.

Recommended tools & DTC Scanners for BMW

Best Diagnostic App for modern BMWs: BimmerLink

Recommended Bluetooth adapter for Bimmerlink: OBDLink CX

Cable adapter for Bimmerlink: Enet Cable USB Type C

For older BMWs we recommend: Autel AutoLink AL319 (2024 version)

Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter

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