BMW DTC P1D90 – Heat Pump Expansion Valve ‘A’ Control Circuit High
DTC P1D90 meaning on BMW
DTC P1D90 on a BMW indicates an issue with the Heat Pump Expansion Valve ‘A’ Control Circuit being detected as high. This means that the control circuit for the expansion valve is reporting a higher than expected voltage or resistance, which can affect the operation of the heat pump system in the vehicle.
BMW DTC P1D90 symptoms
Symptoms of DTC P1D90 on a BMW may include poor heating or cooling performance from the heat pump system, inconsistent temperature control, or in some cases, the system may fail to operate altogether. The Check Engine Light may also be illuminated on the dashboard.
BMW DTC P1D90 causes
The high control circuit reading in the Heat Pump Expansion Valve ‘A’ on a BMW can be caused by various factors such as a faulty expansion valve, damaged wiring or connectors in the control circuit, or issues with the control module itself. Electrical faults or corrosion can also contribute to this problem.
BMW DTC P1D90 seriousness
While DTC P1D90 may not directly impact the drivability of the vehicle, it can affect the comfort and efficiency of the heating and cooling system. Ignoring this issue can lead to further damage to the heat pump components and potentially result in costly repairs if left unresolved.
How to diagnose DTC P1D90 on BMW
To diagnose DTC P1D90 on a BMW, a mechanic would typically start by using a diagnostic scanner to retrieve the fault codes and perform a thorough inspection of the heat pump system. This may involve checking the wiring, connectors, and components related to the Heat Pump Expansion Valve ‘A’ Control Circuit to identify any visible damage or issues.
How to fix DTC P1D90 on BMW
Fixing DTC P1D90 on a BMW may involve replacing the faulty Heat Pump Expansion Valve ‘A’, repairing or replacing damaged wiring or connectors in the control circuit, or addressing any issues with the control module. It is recommended to follow the manufacturer’s diagnostic and repair procedures to ensure the problem is resolved correctly.
How to erase DTC P1D90 on BMW
Once the underlying issue causing DTC P1D90 on a BMW has been identified and fixed, the fault codes can be cleared using a diagnostic scanner. This will reset the Check Engine Light and erase the DTC P1D90 code from the vehicle’s memory. It is important to verify that the repair was successful by ensuring the code does not return after clearing it.
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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