BMW DTC P171F – Internal Transmission Control Module Component CG122 Error
DTC P171F meaning on BMW
The DTC P171F error code on BMW vehicles indicates an Internal Transmission Control Module Component CG122 Error. This fault specifically points to an issue within the transmission control module related to the CG122 component.
BMW DTC P171F symptoms
Symptoms of the BMW DTC P171F error may include erratic shifting behavior, transmission slipping, harsh shifting, transmission overheating, and in some cases, the transmission may go into a fail-safe or limp mode. Additionally, the vehicle’s onboard diagnostic system may illuminate the check engine light.
BMW DTC P171F causes
The DTC P171F error on BMW vehicles can be triggered by various factors, including a faulty transmission control module, issues with the CG122 component, wiring or connection problems, software glitches, or internal transmission faults.
BMW DTC P171F seriousness
The seriousness of the DTC P171F error code on BMW vehicles should not be underestimated, as it directly relates to the transmission control module’s functionality. Ignoring this issue can lead to further transmission damage, drivability issues, and potential safety concerns.
How to diagnose DTC P171F on BMW
To diagnose the DTC P171F error on a BMW, a comprehensive scan tool capable of reading transmission fault codes is required. The diagnostic process involves retrieving the specific error code, checking for related codes, inspecting the transmission control module, testing the CG122 component, and verifying the wiring and connections for any faults.
How to fix DTC P171F on BMW
Fixing the DTC P171F error on a BMW typically involves addressing the root cause of the issue. This may include repairing or replacing the faulty transmission control module, resolving problems with the CG122 component, repairing wiring or connection issues, updating the transmission control module software, or performing necessary transmission repairs.
How to erase DTC P171F on BMW
Once the underlying issue causing the DTC P171F error on a BMW has been resolved, the error code can be cleared using a diagnostic scan tool. By accessing the vehicle’s onboard computer system, the fault codes can be erased, and the check engine light reset. It is essential to ensure that the repair has been successful before clearing the error 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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