BMW DTC P1D91 – Heat Pump Expansion Valve ‘A’ Control Circuit/Open
DTC P1D91 meaning on BMW
The DTC P1D91 fault code on a BMW indicates an issue with the Heat Pump Expansion Valve ‘A’ Control Circuit being open. This means that there is an electrical fault in the circuit that controls the expansion valve, which can affect the operation of the heat pump system in the vehicle.
BMW DTC P1D91 symptoms
Symptoms of the DTC P1D91 code on a BMW may include:
- Reduced heating or cooling performance
- Climate control system not functioning properly
- Check Engine Light (CEL) illuminated on the dashboard
BMW DTC P1D91 causes
Common causes of the DTC P1D91 fault code on a BMW include:
- Faulty heat pump expansion valve
- Wiring or connector issues in the control circuit
- Defective control module
BMW DTC P1D91 seriousness
The DTC P1D91 fault code should be addressed promptly as it can lead to reduced comfort and efficiency of the vehicle’s climate control system. Ignoring this issue may result in further damage to the components involved.
How to diagnose DTC P1D91 on BMW
To diagnose the DTC P1D91 code on a BMW, a mechanic may perform the following steps:
- Use a diagnostic scanner to retrieve the fault codes
- Inspect the heat pump expansion valve and its control circuit for any visible damage
- Check the wiring and connectors for continuity and proper connection
- Test the control module for proper operation
How to fix DTC P1D91 on BMW
To fix the DTC P1D91 fault code on a BMW, the following steps may be taken:
- Replace the faulty heat pump expansion valve
- Repair or replace any damaged wiring or connectors in the control circuit
- Replace the defective control module, if necessary
How to erase DTC P1D91 on BMW
After addressing the underlying issue causing the DTC P1D91 fault code on a BMW, the code can be erased using a diagnostic scanner. This will clear the code from the vehicle’s memory and turn off the Check Engine Light.
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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