BMW DTC U0091 – Vehicle Communication Bus G (-) shorted to Bus G (+)
DTC U0091 meaning on BMW
DTC U0091 for BMW indicates that there is a short circuit between the Vehicle Communication Bus G (-) and Bus G (+). This fault is related to the communication network within the vehicle, which can affect various electronic control modules.
BMW DTC U0091 symptoms
Symptoms of DTC U0091 on a BMW may include issues with communication between control modules, malfunctioning of various vehicle systems such as the instrument cluster, infotainment system, or even drivability issues like rough idling or stalling.
BMW DTC U0091 causes
The main causes of DTC U0091 on a BMW are typically related to wiring issues, such as a short circuit between the Bus G (-) and Bus G (+) lines. This can be due to damaged wiring harnesses, loose connections, or faulty control modules.
BMW DTC U0091 seriousness
DTC U0091 should be addressed promptly as it can lead to communication failures between critical vehicle systems. Ignoring this fault may result in unreliable operation of various components, potentially compromising the safety and performance of the vehicle.
How to diagnose DTC U0091 on BMW
To diagnose DTC U0091 on a BMW, a professional diagnostic scanner capable of reading manufacturer-specific codes is required. The technician will need to inspect the wiring harness for any visible damage, check the connections, and perform continuity tests to identify the location of the short circuit.
How to fix DTC U0091 on BMW
Fixing DTC U0091 on a BMW involves locating and repairing the short circuit between the Bus G (-) and Bus G (+) lines. This may require repairing or replacing damaged wiring, securing loose connections, or replacing faulty control modules if necessary.
How to erase DTC U0091 on BMW
Once the underlying issue causing DTC U0091 on a BMW has been resolved, the fault code can be cleared using a diagnostic scanner. The technician can access the vehicle’s onboard computer system, navigate to the fault code section, and select the option to erase the DTC U0091 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
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