P1D44 – BMW DTC

BMW DTC P1D44 – A/C Coolant Heater Voltage Sensor Circuit High

DTC P1D44 meaning on BMW

DTC P1D44 on a BMW indicates an issue with the A/C coolant heater voltage sensor circuit registering a high voltage. This fault code is specific to the A/C system and relates to the voltage sensor that monitors the electrical signals within the coolant heater system.

BMW DTC P1D44 symptoms

Symptoms of DTC P1D44 on a BMW may include:

• Malfunctioning or inoperative A/C system
• Check Engine Light (CEL) illuminated on the dashboard
• Reduced heating or cooling performance

BMW DTC P1D44 causes

Common causes of DTC P1D44 on a BMW include:

• Faulty A/C coolant heater voltage sensor
• Wiring or connection issues in the voltage sensor circuit
• Corrosion or damage to the sensor or its connectors

BMW DTC P1D44 seriousness

The seriousness of DTC P1D44 on a BMW depends on the underlying cause. While it may not directly affect the drivability of the vehicle, a malfunctioning A/C system can lead to discomfort for the occupants, especially in extreme weather conditions. It is recommended to address this issue promptly to ensure proper functioning of the A/C system.

How to diagnose DTC P1D44 on BMW

To diagnose DTC P1D44 on a BMW, follow these steps:

1. Use a diagnostic scanner to retrieve the fault code and related data
2. Inspect the A/C coolant heater voltage sensor and its wiring for any visible damage
3. Check the sensor’s resistance and voltage readings to verify its functionality
4. Perform a thorough inspection of the A/C system components for any other potential issues

How to fix DTC P1D44 on BMW

To fix DTC P1D44 on a BMW, consider the following steps:

1. Replace the faulty A/C coolant heater voltage sensor if necessary
2. Repair or replace any damaged wiring or connectors in the sensor circuit
3. Clean or address any corrosion on the sensor or its connections
4. Clear the fault code and reset the system to see if the issue persists

How to erase DTC P1D44 on BMW

To erase DTC P1D44 on a BMW, you can:

1. Use a diagnostic scanner to clear the fault code from the vehicle’s memory
2. Ensure that the underlying issue causing the fault code has been addressed
3. Perform a test drive to confirm that the fault code does not reappear

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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