BMW DTC P1D59 – A/C Coolant Heater Phase W Voltage Sensor ‘A’ Range/Performance
DTC P1D59 meaning on BMW
The DTC P1D59 code on a BMW refers to the A/C Coolant Heater Phase W Voltage Sensor ‘A’ Range/Performance issue. This diagnostic trouble code indicates that there is a problem with the voltage sensor related to the A/C coolant heater phase W in the vehicle’s air conditioning system.
BMW DTC P1D59 symptoms
Symptoms of the BMW DTC P1D59 code may include:
- Malfunctioning or ineffective air conditioning system
- Irregular heating or cooling of the cabin
- Check Engine Light (CEL) illuminated on the dashboard
BMW DTC P1D59 causes
Common causes of the BMW DTC P1D59 code include:
- Defective A/C coolant heater phase W voltage sensor
- Wiring or connection issues in the A/C system
- Faulty control module related to the A/C system
BMW DTC P1D59 seriousness
The DTC P1D59 code should not be ignored as it can lead to discomfort while driving, especially in extreme weather conditions. Additionally, continued operation with a malfunctioning A/C system can potentially cause further damage to other components.
How to diagnose DTC P1D59 on BMW
To diagnose the DTC P1D59 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 computer
- Inspect the A/C coolant heater phase W voltage sensor and related wiring for any visible damage or corrosion
- Test the voltage sensor using a multimeter to check for proper functionality
- Check the control module for any signs of malfunction
How to fix DTC P1D59 on BMW
Depending on the diagnosis, fixing the DTC P1D59 code on a BMW may involve:
- Replacing the faulty A/C coolant heater phase W voltage sensor
- Repairing or replacing damaged wiring or connections in the A/C system
- Resetting the control module or reprogramming it if necessary
How to erase DTC P1D59 on BMW
After the issue causing the DTC P1D59 code has been resolved, the code can be erased using a diagnostic scanner. The mechanic can clear the code from the vehicle’s computer to turn off the Check Engine Light and reset the system for normal operation.
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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