BMW DTC P1040 – VVL-CAN-Timeout VVT-Message (Bank 2)
DTC P1040 meaning on BMW
The DTC P1040 for BMW refers to a VVL-CAN-Timeout VVT-Message error on Bank 2. This diagnostic trouble code indicates a communication issue within the Variable Valve Lift (VVL) system on the engine’s Bank 2 side. The VVL system is responsible for adjusting the valve lift to optimize engine performance and efficiency.
BMW DTC P1040 symptoms
Symptoms of the BMW DTC P1040 may include:
- Check Engine Light (MIL) illuminated on the dashboard
- Reduced engine performance
- Engine misfires
- Rough idling or stalling
BMW DTC P1040 causes
The common causes of the BMW DTC P1040 include:
- Faulty VVL solenoid
- Wiring or connection issues in the VVL system
- Defective VVL actuator
- Communication errors within the VVL system
BMW DTC P1040 seriousness
The DTC P1040 error code should not be ignored as it can lead to engine performance issues and potential damage if left unresolved. It is recommended to address this issue promptly to prevent further complications.
How to diagnose DTC P1040 on BMW
To diagnose the DTC P1040 on a BMW, you can follow these steps:
- Use a diagnostic scanner to retrieve the fault codes from the vehicle’s ECU.
- Inspect the VVL solenoid and wiring for any visible damage or corrosion.
- Check the VVL actuator for proper operation.
- Perform a communication test on the VVL system to identify any network issues.
How to fix DTC P1040 on BMW
To fix the DTC P1040 on a BMW, you can try the following solutions:
- Replace the faulty VVL solenoid or actuator.
- Repair any damaged wiring or connections in the VVL system.
- Reset the ECU to clear the fault code and see if it reoccurs.
- Perform a software update on the vehicle’s control modules to address any communication issues.
How to erase DTC P1040 on BMW
To erase the DTC P1040 on a BMW, you can use a diagnostic scanner to clear the fault code from the ECU’s memory. Once the code is cleared, you can drive the vehicle and monitor if the Check Engine Light reappears. If the issue persists, further diagnosis and repairs may be necessary.
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
Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.