BMW DTC P1D42 – Electric A/C Compressor Control Module Temperature/Engine Coolant Temperature Correlation
DTC P1D42 meaning on BMW
DTC P1D42 on a BMW indicates a correlation issue between the Electric A/C Compressor Control Module Temperature and the Engine Coolant Temperature. This means that the control module is not receiving consistent or accurate temperature readings from the engine coolant system, which can affect the operation of the A/C compressor.
BMW DTC P1D42 symptoms
Symptoms of DTC P1D42 on a BMW may include:
- Malfunctioning or erratic operation of the A/C system
- Reduced cooling performance from the A/C system
- Check Engine Light (CEL) illuminated on the dashboard
BMW DTC P1D42 causes
The possible causes of DTC P1D42 on a BMW include:
- Faulty Electric A/C Compressor Control Module
- Defective Engine Coolant Temperature Sensor
- Wiring or connection issues between the control module and the sensor
BMW DTC P1D42 seriousness
While DTC P1D42 may not cause immediate drivability issues, it can impact the performance of the A/C system and potentially lead to discomfort for the occupants, especially in hot weather conditions. It is recommended to address this issue promptly to ensure proper functioning of the A/C system.
How to diagnose DTC P1D42 on BMW
To diagnose DTC P1D42 on a BMW, a mechanic would typically perform the following steps:
- Use a diagnostic scanner to retrieve the fault codes and freeze frame data
- Inspect the Electric A/C Compressor Control Module and Engine Coolant Temperature Sensor for any visible damage
- Check the wiring and connections between the control module and the sensor for any issues
- Perform a temperature comparison test between the control module and the engine coolant system
How to fix DTC P1D42 on BMW
To fix DTC P1D42 on a BMW, the following steps may be taken:
- Replace the Electric A/C Compressor Control Module if it is found to be faulty
- Replace the Engine Coolant Temperature Sensor if it is malfunctioning
- Repair any wiring or connection issues between the control module and the sensor
- Clear the fault codes and perform a test drive to ensure the issue has been resolved
How to erase DTC P1D42 on BMW
To erase DTC P1D42 on a BMW, the fault codes can be cleared using a diagnostic scanner. After the necessary repairs have been made to address the underlying issue, the mechanic can reset the codes, and the Check Engine Light should turn off. It is important to verify that the issue has been resolved before clearing the fault codes.
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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