BMW DTC U1238 – Lost Communication With Torque Request Crankshaft Driving Dynamics
DTC U1238 meaning on BMW
DTC U1238 on a BMW indicates a ¨Lost Communication With Torque Request Crankshaft Driving Dynamics¨ fault. This fault code is related to a communication issue between the engine control module (ECM) and the driving dynamics control module, specifically regarding the torque request signal from the crankshaft.
BMW DTC U1238 symptoms
Symptoms of DTC U1238 on a BMW may include engine performance issues, such as reduced power or hesitation during acceleration. Additionally, the vehicle may experience stability control or traction control malfunctions due to the communication error between the modules.
BMW DTC U1238 causes
The causes of DTC U1238 on a BMW can vary, but common reasons include faulty wiring connections, damaged wiring harnesses, a malfunctioning ECM or driving dynamics control module, or a communication bus fault within the vehicle’s network.
BMW DTC U1238 seriousness
The seriousness of DTC U1238 on a BMW lies in the potential impact on engine performance and vehicle stability control systems. Ignoring this fault code can lead to unsafe driving conditions and may result in further damage to the vehicle if left unresolved.
How to diagnose DTC U1238 on BMW
To diagnose DTC U1238 on a BMW, a comprehensive scan tool capable of reading manufacturer-specific fault codes is required. The technician should inspect the wiring harness for any visible damage, check the connections between the ECM and driving dynamics control module, and perform a communication network test to identify the source of the issue.
How to fix DTC U1238 on BMW
Fixing DTC U1238 on a BMW involves addressing the root cause of the communication error. This may include repairing or replacing damaged wiring, ensuring proper connections between modules, or replacing faulty components like the ECM or driving dynamics control module. Once the issue is resolved, the fault code should be cleared, and the vehicle should be tested to ensure proper functionality.
How to erase DTC U1238 on BMW
To erase DTC U1238 on a BMW, a diagnostic scan tool capable of clearing fault codes is needed. After addressing the underlying cause of the fault code and ensuring the repairs have been completed, the technician can use the scan tool to clear the code from the vehicle’s memory. This step should be followed by a test drive to confirm that the fault code does not reappear.
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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