P06A4 – BMW DTC

BMW DTC P06A4 – Sensor Reference Voltage ‘D’ Circuit Low

DTC P06A4 meaning on BMW

DTC P06A4 for BMW refers to the Sensor Reference Voltage ‘D’ Circuit Low. This diagnostic trouble code indicates that the voltage signal from the sensor reference circuit ‘D’ is below the expected range. The Engine Control Module (ECM) detects this issue and triggers the fault code.

BMW DTC P06A4 symptoms

Symptoms of DTC P06A4 on a BMW may include:

• Check Engine Light (MIL) illuminated
• Reduced engine performance
• Engine stalling or rough idling
• Decreased fuel efficiency

BMW DTC P06A4 causes

Common causes of DTC P06A4 on a BMW include:

• Faulty sensor reference voltage circuit
• Short circuit or open circuit in the wiring related to the sensor circuit
• Defective Engine Control Module (ECM)

BMW DTC P06A4 seriousness

DTC P06A4 should not be ignored as it can lead to potential drivability issues and affect the overall performance of the vehicle. It is recommended to address this fault code promptly to prevent further damage to the vehicle’s components.

How to diagnose DTC P06A4 on BMW

To diagnose DTC P06A4 on a BMW, follow these steps:

1. Use a diagnostic scanner to retrieve the fault code and freeze frame data
2. Inspect the sensor reference voltage circuit for any visible damage or loose connections
3. Check the wiring harness for continuity and shorts
4. Test the sensor reference voltage with a multimeter to ensure it is within the specified range
5. If necessary, perform a pinpoint test to identify the exact cause of the issue

How to fix DTC P06A4 on BMW

To fix DTC P06A4 on a BMW, consider the following:

1. Repair or replace any damaged wiring or connectors in the sensor reference voltage circuit
2. Replace the faulty sensor if necessary
3. If the ECM is determined to be the cause, reprogram or replace it as needed
4. Clear the fault code and perform a road test to ensure the issue has been resolved

How to erase DTC P06A4 on BMW

To erase DTC P06A4 on a BMW, you can use a diagnostic scanner to clear the fault code from the ECM’s memory. After the repair has been completed, ensure that the issue causing the fault code has been resolved before clearing it. This will prevent the code from reappearing and help verify the effectiveness of the repair.

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

Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.