BMW DTC P1078 – VVL-Overload Protection Control Motor Current Circuit High (Bank 1)
DTC P1078 meaning on BMW
The Diagnostic Trouble Code (DTC) P1078 for BMW refers to the VVL-Overload Protection Control Motor Current Circuit High on Bank 1. This code indicates that there is a high current condition detected in the Variable Valve Lift (VVL) system’s overload protection control motor circuit on Bank 1 of the engine.
BMW DTC P1078 symptoms
Symptoms of the BMW DTC P1078 may include:
- Check Engine Light (CEL) illuminated on the dashboard
- Reduced engine performance
- Engine misfires
- Engine stalling
BMW DTC P1078 causes
Common causes of the BMW DTC P1078 may include:
- Faulty VVL-Overload Protection Control Motor
- Short circuit or open circuit in the motor wiring
- Issues with the VVL system control module
- Electrical problems in the VVL system
BMW DTC P1078 seriousness
The BMW DTC P1078 should be addressed promptly to prevent potential damage to the engine and ensure optimal performance. Ignoring this code may lead to further engine issues and increased fuel consumption.
How to diagnose DTC P1078 on BMW
To diagnose the DTC P1078 on a BMW, you can follow these steps:
- Use a diagnostic scanner to retrieve the fault codes
- Inspect the VVL-Overload Protection Control Motor and its wiring for any visible damage
- Check the VVL system control module for proper operation
- Perform a circuit test to identify any electrical faults
How to fix DTC P1078 on BMW
To fix the DTC P1078 on a BMW, you can consider the following actions:
- Replace the faulty VVL-Overload Protection Control Motor
- Repair any damaged wiring in the motor circuit
- Address any issues with the VVL system control module
- Clear the fault codes and perform a test drive to ensure the issue is resolved
How to erase DTC P1078 on BMW
To erase the DTC P1078 on a BMW, you can use a diagnostic scanner to clear the fault codes stored in the vehicle’s system. After clearing the codes, it is recommended to perform a test drive to verify that the issue has been resolved successfully.
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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