P1D4E – BMW DTC

BMW DTC P1D4E – A/C Coolant Heater Phase W Current Sensor Circuit Low

DTC P1D4E meaning on BMW

The DTC P1D4E error code on a BMW indicates an issue with the A/C coolant heater phase W current sensor circuit being detected as low. This means that the sensor responsible for monitoring the current in the A/C coolant heater system is reporting a lower value than expected.

BMW DTC P1D4E symptoms

Symptoms of the BMW DTC P1D4E error code may include:

• Malfunctioning or ineffective air conditioning system
• Check Engine Light (CEL) illuminated on the dashboard
• Reduced heating or cooling performance

BMW DTC P1D4E causes

Possible causes of the BMW DTC P1D4E error code include:

• Faulty A/C coolant heater phase W current sensor
• Wiring or connection issues in the sensor circuit
• Defective control module related to the A/C system

BMW DTC P1D4E seriousness

The seriousness of the BMW DTC P1D4E error code lies in the potential impact on the functionality of the air conditioning system. Ignoring this issue may lead to discomfort while driving, especially in extreme weather conditions. It is advisable to address this problem promptly to ensure proper operation of the A/C system.

How to diagnose DTC P1D4E on BMW

To diagnose the DTC P1D4E error code on a BMW, you can follow these steps:

1. Use a diagnostic scanner to retrieve the specific fault codes stored in the vehicle’s computer.
2. Inspect the A/C coolant heater phase W current sensor and its wiring for any visible damage or corrosion.
3. Check the connections and terminals related to the sensor circuit for proper contact and continuity.
4. Perform a thorough inspection of the A/C system components to identify any other potential issues.

How to fix DTC P1D4E on BMW

To fix the DTC P1D4E error code on a BMW, you can consider the following solutions:

1. Replace the faulty A/C coolant heater phase W current sensor with a new, compatible unit.
2. Repair or replace any damaged wiring or connections in the sensor circuit.
3. If necessary, address any issues with the control module associated with the A/C system.
4. Clear the fault codes using a diagnostic scanner after completing the repairs.

How to erase DTC P1D4E on BMW

To erase the DTC P1D4E error code on a BMW, you can follow these steps:

1. Use a diagnostic scanner to access the vehicle’s onboard computer system.
2. Select the option to clear or reset the fault codes stored in the system.
3. Follow the prompts on the scanner to confirm the deletion of the DTC P1D4E error code.
4. Once the process is complete, verify that the error 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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