U1242 – BMW DTC

BMW DTC U1242 – Message Monitoring Steering Angle Front Axle Check Sum Error

DTC U1242 meaning on BMW

The DTC U1242 code on a BMW indicates a Message Monitoring Steering Angle Front Axle Check Sum Error. This error occurs when the control module detects a discrepancy in the data related to the steering angle sensor on the front axle. The control module compares the calculated check sum value with the expected value and triggers the U1242 error if they do not match.

BMW DTC U1242 symptoms

Symptoms of the BMW DTC U1242 code may include:

• Malfunction indicator light (MIL) or check engine light illuminated on the dashboard
• Loss of power steering assistance
• Inaccurate steering angle readings
• Stability control system (DSC) or traction control system (TCS) warning lights illuminated

BMW DTC U1242 causes

The common causes of the BMW DTC U1242 code include:

• Steering angle sensor malfunction
• Faulty wiring or connectors in the steering angle sensor circuit
• Control module software issues
• Interference from other electronic components

BMW DTC U1242 seriousness

The DTC U1242 error code should not be ignored as it can affect the proper functioning of the vehicle’s stability control systems and power steering assistance. Driving with this error present may compromise the vehicle’s safety and handling characteristics.

How to diagnose DTC U1242 on BMW

To diagnose the DTC U1242 code on a BMW, a mechanic may perform the following steps:

1. Use a diagnostic scanner to retrieve the fault codes stored in the vehicle’s control module
2. Inspect the wiring and connectors related to the steering angle sensor for any damage or corrosion
3. Check the steering angle sensor for proper operation and calibration
4. Perform a software update or reprogramming of the control module if necessary

How to fix DTC U1242 on BMW

To fix the DTC U1242 code on a BMW, the following steps may be taken:

1. Replace the faulty steering angle sensor if it is determined to be the cause of the error
2. Repair or replace any damaged wiring or connectors in the steering angle sensor circuit
3. Perform a software update or reprogramming of the control module to address any software issues
4. Clear the fault codes using a diagnostic scanner after the repairs have been completed

How to erase DTC U1242 on BMW

To erase the DTC U1242 code on a BMW, follow these steps:

1. Connect a diagnostic scanner to the vehicle’s OBD-II port
2. Select the option to clear fault codes from the control module
3. Follow the on-screen prompts to erase the DTC U1242 code
4. Ensure that the issue causing the error code has been resolved 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

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.