BMW DTC P0946 – Hydraulic Pump Relay/Control Circuit Range/Performance
DTC P0946 meaning on BMW
DTC P0946 on a BMW indicates an issue with the hydraulic pump relay/control circuit. This fault code is triggered when the Engine Control Module (ECM) detects that the signal from the hydraulic pump relay or control circuit is outside the expected range or performance parameters.
BMW DTC P0946 symptoms
Symptoms of DTC P0946 on a BMW may include:
- Check Engine Light illuminated
- Hydraulic pump not functioning properly
- Transmission shifting issues
- Reduced vehicle performance
BMW DTC P0946 causes
Common causes of DTC P0946 on a BMW include:
- Faulty hydraulic pump relay
- Issues with the hydraulic pump control circuit
- Wiring or connection problems
- Defective Engine Control Module (ECM)
BMW DTC P0946 seriousness
DTC P0946 should be addressed promptly as it can lead to transmission and hydraulic pump issues, affecting the vehicle’s drivability and performance.
How to diagnose DTC P0946 on BMW
To diagnose DTC P0946 on a BMW, a mechanic would typically perform the following steps:
- Use a diagnostic scanner to retrieve the fault code and related data
- Inspect the hydraulic pump relay and control circuit for any visible damage or corrosion
- Check the wiring and connections for continuity and proper voltage
- Test the hydraulic pump relay and control circuit for proper operation
- If necessary, perform further testing using specialized diagnostic equipment
How to fix DTC P0946 on BMW
To fix DTC P0946 on a BMW, the following steps may be taken:
- Replace the faulty hydraulic pump relay if necessary
- Repair any issues with the hydraulic pump control circuit
- Address any wiring or connection problems
- If the ECM is found to be defective, it may need to be replaced or reprogrammed
- Clear the fault code and test the vehicle to ensure the issue has been resolved
How to erase DTC P0946 on BMW
To erase DTC P0946 on a BMW, the fault code can be cleared using a diagnostic scanner or by disconnecting the vehicle’s battery for a few minutes. However, it is important to address the underlying issue causing the fault code before clearing it to prevent it from reoccurring.
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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