P066E – BMW DTC

BMW DTC P066E – Cylinder 3 Glow Plug Control Circuit Low

DTC P066E meaning on BMW

DTC P066E indicates a low voltage condition in the cylinder 3 glow plug control circuit of a BMW vehicle. The Engine Control Module (ECM) monitors the glow plug control circuit to ensure proper operation of the glow plugs, which are essential for cold starting diesel engines. A low voltage reading in this circuit suggests a potential issue with the glow plug system in cylinder 3.

BMW DTC P066E symptoms

Symptoms of DTC P066E in a BMW may include:

• Difficulty starting the engine, especially in cold weather
• Engine misfires or rough idling
• Reduced engine performance
• Illumination of the Check Engine Light

BMW DTC P066E causes

Common causes of DTC P066E in a BMW include:

• Defective glow plug in cylinder 3
• Wiring or connector issues in the glow plug control circuit
• Faulty Engine Control Module (ECM)
• Corrosion or poor connections in the circuit

BMW DTC P066E seriousness

Ignoring DTC P066E in a BMW can lead to starting difficulties, reduced engine performance, and potential engine damage over time. It is important to address this issue promptly to ensure proper functioning of the glow plug system and overall engine health.

How to diagnose DTC P066E on BMW

To diagnose DTC P066E on a BMW, follow these steps:

1. Use a diagnostic scanner to retrieve the fault code and freeze frame data
2. Inspect the glow plug in cylinder 3 for signs of damage or wear
3. Check the wiring and connectors in the glow plug control circuit for any issues
4. Test the voltage in the circuit to determine if it is within specifications
5. Perform a continuity test to ensure proper electrical connections

How to fix DTC P066E on BMW

To fix DTC P066E on a BMW, consider the following steps:

1. Replace the defective glow plug in cylinder 3
2. Repair or replace any damaged wiring or connectors in the glow plug control circuit
3. If necessary, replace the Engine Control Module (ECM)
4. Clean any corrosion and ensure proper connections in the circuit
5. Clear the fault code and test the vehicle to ensure the issue is resolved

How to erase DTC P066E on BMW

To erase DTC P066E on a BMW, follow these steps:

1. Use a diagnostic scanner to clear the fault code from the ECM
2. Start the engine and ensure the Check Engine Light is no longer illuminated
3. Drive the vehicle to confirm that the issue has been resolved

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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