BMW DTC P1D43 – A/C Coolant Heater Voltage Sensor Circuit Low
DTC P1D43 meaning on BMW
- DTC: Diagnostic Trouble Code
- P1D43: A/C Coolant Heater Voltage Sensor Circuit Low
- This code indicates that the voltage sensor circuit for the A/C coolant heater in your BMW is reading a low voltage signal.
BMW DTC P1D43 symptoms
- Malfunction indicator light (MIL) or check engine light may illuminate
- Issues with the A/C system operation
- Possible lack of heat in the cabin
BMW DTC P1D43 causes
- Faulty A/C coolant heater voltage sensor
- Wiring or connection issues in the voltage sensor circuit
- Electrical problems in the A/C system
BMW DTC P1D43 seriousness
- While this DTC may not cause immediate drivability issues, it can affect the comfort and functionality of the A/C system in your BMW.
- It is recommended to address this code to ensure proper operation of the A/C system.
How to diagnose DTC P1D43 on BMW
- Use a diagnostic scanner to retrieve the DTC and related freeze frame data
- Inspect the A/C coolant heater voltage sensor and its wiring for any visible damage or corrosion
- Perform voltage tests on the sensor circuit to determine if the sensor is functioning correctly
How to fix DTC P1D43 on BMW
- Replace the faulty A/C coolant heater voltage sensor if it is determined to be the cause
- Repair any damaged wiring or connections in the sensor circuit
- Ensure proper electrical connections in the A/C system
How to erase DTC P1D43 on BMW
- After addressing the underlying issue, use a diagnostic scanner to clear the DTC from the vehicle’s memory
- Ensure that the repair has resolved the problem before clearing the code
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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