BMW DTC P1D49 – A/C Coolant Heater Phase U Current Sensor Circuit High
DTC P1D49 meaning on BMW
The DTC P1D49 error code on BMW vehicles indicates an issue with the A/C coolant heater phase U current sensor circuit registering a high voltage. This fault is related to the operation of the coolant heater system in the vehicle.
BMW DTC P1D49 symptoms
Symptoms of the DTC P1D49 error code on a BMW may include:
- Malfunctioning or ineffective A/C system
- Check Engine Light (CEL) illuminated on the dashboard
- Reduced heating or cooling performance
BMW DTC P1D49 causes
Common causes of the DTC P1D49 error code on BMW vehicles include:
- Faulty A/C coolant heater phase U current sensor
- Wiring issues or poor connections in the sensor circuit
- Defective control module related to the coolant heater system
BMW DTC P1D49 seriousness
The DTC P1D49 error code should not be ignored as it can lead to reduced comfort and functionality of the A/C system in the vehicle. While it may not directly affect the drivability of the vehicle, addressing this issue is important for optimal climate control performance.
How to diagnose DTC P1D49 on BMW
To diagnose the DTC P1D49 error code on a BMW, a mechanic may perform the following steps:
- Use a diagnostic scanner to retrieve the specific fault codes stored in the vehicle’s system
- Inspect the A/C coolant heater phase U current sensor and its wiring for any visible damage or corrosion
- Check the control module associated with the coolant heater system for proper operation
How to fix DTC P1D49 on BMW
To fix the DTC P1D49 error code on a BMW, the following steps may be taken:
- Replace the faulty A/C coolant heater phase U current sensor if it is determined to be the cause of the issue
- Repair any damaged wiring or connections in the sensor circuit
- If the control module is found to be defective, it may need to be replaced or reprogrammed
How to erase DTC P1D49 on BMW
After addressing the underlying cause of the DTC P1D49 error code on a BMW, the code can be cleared using a diagnostic scanner. This will reset the vehicle’s system and turn off the Check Engine Light. It is important to ensure that the issue has been properly resolved 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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