U11AC – BMW DTC

BMW DTC U11AC – Message Monitoring Torque Request Crankshaft Transmission Data via FA-CAN Check Sum Error

DTC U11AC meaning on BMW

The Diagnostic Trouble Code (DTC) U11AC for BMW refers to ¨Message Monitoring Torque Request Crankshaft Transmission Data via FA-CAN Check Sum Error.¨ This code indicates that there is a communication error related to the torque request signal between the crankshaft and the transmission control modules on the vehicle’s FA-CAN network.

BMW DTC U11AC symptoms

Symptoms associated with the BMW DTC U11AC may include:

• Check Engine Light (MIL) illuminated on the dashboard
• Reduced engine performance or power loss
• Transmission shifting issues
• Vehicle going into limp mode

BMW DTC U11AC causes

Common causes of the BMW DTC U11AC may include:

• Faulty crankshaft or transmission control modules
• Wiring or connection issues in the FA-CAN network
• Software or programming errors
• Interference from other electronic components

BMW DTC U11AC seriousness

The seriousness of the BMW DTC U11AC code lies in the potential drivability issues it can cause. Ignoring this code may lead to further damage to the vehicle’s drivetrain components and could result in unsafe driving conditions.

How to diagnose DTC U11AC on BMW

To diagnose the DTC U11AC on a BMW, a mechanic would typically perform the following steps:

1. Use a diagnostic scanner to retrieve the fault codes stored in the vehicle’s computer
2. Inspect the FA-CAN network for any wiring or connection issues
3. Check the crankshaft and transmission control modules for proper operation
4. Perform a software update or reprogramming if necessary

How to fix DTC U11AC on BMW

Fixing the BMW DTC U11AC code may involve the following steps:

1. Repair or replace any faulty crankshaft or transmission control modules
2. Address any wiring or connection issues in the FA-CAN network
3. Update or reprogram the software in the affected modules
4. Clear the fault codes and perform a test drive to ensure the issue is resolved

How to erase DTC U11AC on BMW

To erase the DTC U11AC on a BMW, a mechanic can use a diagnostic scanner to clear the fault codes stored in the vehicle’s computer. After addressing the underlying issue that caused the code, the mechanic can then perform a final scan to ensure that the code has been successfully erased.

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.