BMW DTC P17BB – Transmission Torque Loss – Faulty Feedback Signal on FA-CAN
DTC P17BB meaning on BMW
The DTC P17BB on a BMW indicates a transmission torque loss due to a faulty feedback signal on the FA-CAN (FlexRay Communication on the Control Area Network) system. This fault code is specific to BMW vehicles and is related to the transmission control module.
BMW DTC P17BB symptoms
Symptoms of the DTC P17BB on a BMW may include harsh shifting, transmission slipping, reduced acceleration, and in some cases, the transmission may go into a limp mode where it operates in a limited capacity to prevent further damage.
BMW DTC P17BB causes
The most common causes of the DTC P17BB on a BMW are a faulty transmission control module, damaged wiring or connectors in the FA-CAN system, or a malfunctioning sensor that provides feedback to the transmission control module.
BMW DTC P17BB seriousness
The DTC P17BB on a BMW should be taken seriously as it can lead to drivability issues and potential damage to the transmission if left unresolved. It is recommended to address this fault code promptly to prevent further complications.
How to diagnose DTC P17BB on BMW
To diagnose the DTC P17BB on a BMW, a diagnostic scan tool capable of reading transmission fault codes will be needed. The technician will need to inspect the FA-CAN system, check for any damaged wiring or connectors, and test the sensors related to transmission feedback for proper operation.
How to fix DTC P17BB on BMW
Fixing the DTC P17BB on a BMW may involve repairing or replacing the faulty transmission control module, repairing any damaged wiring or connectors in the FA-CAN system, or replacing the malfunctioning sensor causing the feedback signal issue. It is recommended to follow the manufacturer’s repair procedures for a proper fix.
How to erase DTC P17BB on BMW
Once the underlying issue causing the DTC P17BB on a BMW has been resolved, the fault code can be erased using a diagnostic scan tool. The technician can clear the code from the transmission control module’s memory, and the vehicle should be retested to ensure the fault 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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