BMW DTC P1056 – VVL-Control Motor Supply Voltage Circuit Low (Bank 1)
DTC P1056 meaning on BMW
DTC P1056 for BMW refers to the VVL-Control Motor Supply Voltage Circuit Low on Bank 1. This diagnostic trouble code indicates that there is a low voltage condition detected in the Variable Valve Lift (VVL) system’s control motor supply circuit on the bank 1 side of the engine.
BMW DTC P1056 symptoms
Symptoms of DTC P1056 on a BMW may include:
- Check Engine Light (CEL) illuminated on the dashboard
- Reduced engine performance
- Engine running rough or misfiring
- Decreased fuel efficiency
BMW DTC P1056 causes
Common causes of DTC P1056 on a BMW include:
- Faulty VVL control motor
- Wiring or connector issues in the VVL control motor circuit
- Low engine oil level or poor oil quality
- Electronic control module (ECM) failure
BMW DTC P1056 seriousness
While DTC P1056 may not always result in immediate drivability issues, it is important to address this fault promptly to prevent potential long-term damage to the engine and ensure optimal performance.
How to diagnose DTC P1056 on BMW
To diagnose DTC P1056 on a BMW, a mechanic would typically perform the following steps:
- Use a diagnostic scanner to retrieve the fault code and freeze frame data
- Inspect the VVL control motor and its wiring for any visible damage or corrosion
- Check the engine oil level and quality
- Test the VVL control motor and related components for proper operation
How to fix DTC P1056 on BMW
To fix DTC P1056 on a BMW, the following steps may be taken:
- Repair or replace any damaged wiring or connectors in the VVL control motor circuit
- Replace the faulty VVL control motor if necessary
- Ensure the engine oil level is correct and of good quality
- If the ECM is suspected to be the issue, have it tested and replaced if needed
How to erase DTC P1056 on BMW
After the underlying issue causing DTC P1056 on a BMW has been resolved, the fault code can be cleared using a diagnostic scanner. This will reset the Check Engine Light and erase the DTC from the vehicle’s memory.
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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