U1174 – BMW DTC

BMW DTC U1174 – Message Monitoring VVL-Control Module Alive Check/Check Sum Error

DTC U1174 meaning on BMW

The Diagnostic Trouble Code (DTC) U1174 for BMW refers to a Message Monitoring VVL-Control Module Alive Check/Check Sum Error. This error code indicates a communication issue or checksum error related to the Variable Valve Lift (VVL) control module in the vehicle.

BMW DTC U1174 symptoms

Symptoms of the BMW DTC U1174 may include:

• Check Engine Light (MIL) illuminated
• Reduced engine performance
• Engine misfires
• Difficulty starting the engine

BMW DTC U1174 causes

Possible causes of the BMW DTC U1174 include:

• Faulty VVL control module
• Wiring or connection issues
• Software or programming errors
• Interference from other control modules

BMW DTC U1174 seriousness

The seriousness of the BMW DTC U1174 error code lies in its potential to affect the engine performance and overall drivability of the vehicle. Ignoring this code may lead to further engine issues and reduced efficiency.

How to diagnose DTC U1174 on BMW

To diagnose the DTC U1174 on a BMW, follow these steps:

1. Use a diagnostic scanner to retrieve the specific fault codes.
2. Inspect the wiring and connections related to the VVL control module.
3. Check for any software updates or reprogramming needed for the control module.
4. Perform a thorough inspection of the VVL control module for any signs of damage or malfunction.

How to fix DTC U1174 on BMW

To fix the DTC U1174 on a BMW, consider the following:

1. Repair or replace any faulty wiring or connections.
2. If the VVL control module is defective, replace it with a new one.
3. Ensure that the control module is properly programmed and updated with the latest software.
4. Clear the fault codes using a diagnostic scanner after the repairs are completed.

How to erase DTC U1174 on BMW

To erase the DTC U1174 on a BMW, follow these steps:

1. Connect a diagnostic scanner to the vehicle’s OBD-II port.
2. Select the option to clear or erase fault codes from the control module menu.
3. Confirm the action and wait for the scanner to clear the DTC U1174 code.
4. Once the code is successfully cleared, disconnect the scanner and start the vehicle to ensure the code does not reappear.

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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