U1403 – BMW DTC

BMW DTC U1403 – Invalid Data Received From Wheel Speed Sensor Front Left

DTC U1403 meaning on BMW

DTC U1403 on a BMW indicates that the Engine Control Module (ECM) has detected invalid data coming from the Wheel Speed Sensor located on the front left side of the vehicle. The Wheel Speed Sensor is responsible for monitoring the speed of the front left wheel and providing this information to the ECM for various vehicle systems to function properly.

BMW DTC U1403 symptoms

Symptoms of DTC U1403 on a BMW may include:

• ABS warning light illuminated on the dashboard
• Traction control system malfunction
• Stability control system not functioning correctly
• Loss of traction control during driving

BMW DTC U1403 causes

The common causes of DTC U1403 on a BMW are:

• Faulty Wheel Speed Sensor Front Left
• Corroded or damaged wiring/connectors leading to the sensor
• ECM software issue

BMW DTC U1403 seriousness

DTC U1403 should be taken seriously as it can affect the proper functioning of the vehicle’s safety systems, such as ABS, traction control, and stability control. Driving with this fault unresolved may compromise the vehicle’s ability to maintain control during braking and cornering maneuvers.

How to diagnose DTC U1403 on BMW

To diagnose DTC U1403 on a BMW, follow these steps:

1. Use a diagnostic scanner to retrieve the fault codes stored in the ECM.
2. Inspect the wiring and connectors leading to the Wheel Speed Sensor Front Left for any damage or corrosion.
3. Test the Wheel Speed Sensor Front Left using a multimeter to check for proper resistance and signal output.
4. If necessary, perform a visual inspection of the sensor itself for any physical damage.

How to fix DTC U1403 on BMW

To fix DTC U1403 on a BMW, you can:

1. Replace the Wheel Speed Sensor Front Left if it is found to be faulty.
2. Repair or replace any damaged or corroded wiring/connectors leading to the sensor.
3. If the issue persists, reprogram or update the ECM software to address any software-related issues.

How to erase DTC U1403 on BMW

To erase DTC U1403 on a BMW, you can:

1. Use a diagnostic scanner to clear the fault codes stored in the ECM.
2. After making the necessary repairs or replacements, perform a road test to ensure the fault code does not return.

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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