P066C – BMW DTC

BMW DTC P066C – Cylinder 2 Glow Plug Control Circuit Low

DTC P066C meaning on BMW

The Diagnostic Trouble Code (DTC) P066C for BMW refers to an issue with the Cylinder 2 Glow Plug Control Circuit being detected as low. This code indicates a problem with the control circuit responsible for managing the glow plug in cylinder 2 of the engine.

BMW DTC P066C symptoms

Symptoms associated with DTC P066C on a BMW may include:

• Engine misfires
• Reduced engine performance
• Difficulty starting the engine, especially in cold conditions
• Increased fuel consumption
• Check Engine Light (CEL) illuminated on the dashboard

BMW DTC P066C causes

Common causes of DTC P066C on a BMW include:

• Faulty glow plug in cylinder 2
• Issues with the glow plug control module
• Wiring or connection problems in the glow plug circuit
• Software or programming issues

BMW DTC P066C seriousness

Ignoring or neglecting DTC P066C on a BMW can lead to more severe engine problems over time. If left unresolved, it can result in decreased engine performance, potential damage to engine components, and increased fuel consumption. It is recommended to address this issue promptly to prevent further complications.

How to diagnose DTC P066C on BMW

To diagnose DTC P066C on a BMW, you can follow these steps:

1. Use a diagnostic scanner to retrieve the fault codes stored in the vehicle’s Engine Control Module (ECM).
2. Inspect the glow plug in cylinder 2 for any signs of damage or malfunction.
3. Check the wiring and connections in the glow plug control circuit for any loose connections or corrosion.
4. Test the glow plug control module for proper functionality.

How to fix DTC P066C on BMW

To fix DTC P066C on a BMW, you can consider the following actions:

1. Replace the faulty glow plug in cylinder 2 if necessary.
2. Repair any damaged wiring or connections in the glow plug control circuit.
3. Replace the glow plug control module if it is found to be defective.
4. Clear the fault codes using a diagnostic scanner after completing the repairs.

How to erase DTC P066C on BMW

To erase DTC P066C on a BMW, you can use a diagnostic scanner to clear the fault codes stored in the ECM. Follow these steps:

1. Connect the diagnostic scanner to the vehicle’s OBD-II port.
2. Select the option to erase fault codes from the ECM.
3. Confirm the action and wait for the scanner to clear the DTC P066C code.
4. Once the process is complete, disconnect the scanner and start the vehicle to ensure the code has been successfully erased.

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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