BMW DTC P0945 – Hydraulic Pump Relay/Control Circuit/Open
DTC P0945 meaning on BMW
DTC P0945 on a BMW indicates an issue with the hydraulic pump relay/control circuit being open. This means that the powertrain control module (PCM) has detected a malfunction in the circuit responsible for controlling the hydraulic pump, which is a crucial component of the vehicle’s hydraulic system.
BMW DTC P0945 symptoms
Symptoms of DTC P0945 on a BMW may include:
- Malfunction indicator lamp (MIL) or check engine light illuminated on the dashboard
- Hydraulic system failure or erratic operation
- Loss of power steering assistance
- Unusual noises coming from the hydraulic pump
BMW DTC P0945 causes
The common causes of DTC P0945 on a BMW include:
- Faulty hydraulic pump relay
- Open or short circuit in the hydraulic pump relay/control wiring
- Defective hydraulic pump
- Issues with the powertrain control module (PCM)
BMW DTC P0945 seriousness
DTC P0945 should be addressed promptly as it can lead to the loss of hydraulic system functionality, affecting critical components like power steering. Ignoring this fault may result in unsafe driving conditions and potential damage to other vehicle systems.
How to diagnose DTC P0945 on BMW
To diagnose DTC P0945 on a BMW, follow these steps:
- Use a diagnostic scanner to retrieve the fault codes stored in the PCM.
- Inspect the hydraulic pump relay and related wiring for any visible damage or corrosion.
- Test the continuity of the relay/control circuit using a multimeter.
- Check the hydraulic pump for proper operation and connection.
- If necessary, perform a thorough inspection of the PCM and its connections.
How to fix DTC P0945 on BMW
To fix DTC P0945 on a BMW, consider the following steps:
- Replace the faulty hydraulic pump relay if found defective.
- Repair any open or short circuits in the relay/control wiring.
- If the hydraulic pump is faulty, replace it with a new unit.
- Ensure proper connection and functionality of the hydraulic pump.
- If the issue persists, consult a professional mechanic for further diagnosis and repair.
How to erase DTC P0945 on BMW
To erase DTC P0945 on a BMW, follow these steps:
- Use a diagnostic scanner to clear the fault codes stored in the PCM.
- After making the necessary repairs, drive the vehicle to allow the PCM to relearn the system.
- Perform a final scan to ensure the fault code has been successfully erased.
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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