U124E – BMW DTC

BMW DTC U124E – Communication Monitoring Input Signals Vehicle Speed

DTC U124E meaning on BMW

DTC U124E on a BMW refers to a fault in the communication monitoring input signals related to vehicle speed. This diagnostic trouble code indicates that there is an issue with the system that monitors the vehicle speed signals for communication errors or inconsistencies.

BMW DTC U124E symptoms

Symptoms of DTC U124E on a BMW may include:

• Malfunction indicator light (MIL) illuminated on the dashboard
• Inaccurate speedometer readings
• Loss of communication with the vehicle speed sensor

BMW DTC U124E causes

Common causes of DTC U124E on a BMW include:

• Faulty vehicle speed sensor
• Wiring or connection issues in the speed sensor circuit
• Defective control module responsible for monitoring vehicle speed signals

BMW DTC U124E seriousness

The seriousness of DTC U124E on a BMW depends on the underlying cause. While it may not always result in immediate drivability issues, ignoring this fault can lead to inaccurate speed readings and potential safety concerns. It is recommended to address this DTC promptly.

How to diagnose DTC U124E on BMW

To diagnose DTC U124E on a BMW, follow these steps:

1. Use a diagnostic scanner to retrieve the fault codes stored in the vehicle’s system
2. Inspect the vehicle speed sensor and its wiring for any visible damage or corrosion
3. Check the connections and terminals related to the speed sensor circuit
4. Perform a continuity test on the wiring to ensure proper signal transmission

How to fix DTC U124E on BMW

To fix DTC U124E on a BMW, consider the following:

1. Replace the faulty vehicle speed sensor if it is determined to be the cause
2. Repair any damaged wiring or connections in the speed sensor circuit
3. If the control module is faulty, it may need to be replaced or reprogrammed

How to erase DTC U124E on BMW

To erase DTC U124E on a BMW, use a diagnostic scanner to clear the fault codes stored in the vehicle’s system. After addressing the underlying issue causing the fault code, resetting the codes will turn off the malfunction indicator light (MIL) on the dashboard.

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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