BMW DTC U1140 – Throttle Valve Communication Bus off
DTC U1140 meaning on BMW
The Diagnostic Trouble Code (DTC) U1140 for BMW indicates a communication error on the throttle valve communication bus. This means that there is a problem with the communication between the throttle valve and the vehicle’s electronic control unit (ECU).
BMW DTC U1140 symptoms
Symptoms of the DTC U1140 on a BMW may include:
- Reduced engine performance
- Engine stalling
- Throttle response issues
- Check Engine Light (CEL) illuminated on the dashboard
BMW DTC U1140 causes
Common causes of the DTC U1140 on a BMW include:
- Faulty throttle valve
- Wiring or connection issues in the throttle valve communication bus
- ECU communication errors
BMW DTC U1140 seriousness
The DTC U1140 on a BMW should be addressed promptly as it can lead to drivability issues and potential safety concerns. Ignoring this code may result in further damage to the vehicle’s components.
How to diagnose DTC U1140 on BMW
To diagnose the DTC U1140 on a BMW, a mechanic would typically:
- Use a diagnostic scanner to retrieve the fault codes
- Inspect the throttle valve for any physical damage
- Check the wiring and connections in the throttle valve communication bus
- Perform a communication test between the throttle valve and the ECU
How to fix DTC U1140 on BMW
To fix the DTC U1140 on a BMW, the following steps may be taken:
- Repair or replace the faulty throttle valve
- Repair any damaged wiring or connections in the throttle valve communication bus
- Reset the ECU and clear the fault codes
- Perform a test drive to ensure the issue has been resolved
How to erase DTC U1140 on BMW
To erase the DTC U1140 on a BMW, a mechanic can use a diagnostic scanner to clear the fault codes stored in the ECU. Once the codes are cleared, the Check Engine Light should turn off. It is important to ensure that the underlying issue causing the fault code has been addressed before clearing the code.
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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