BMW DTC P171E – Internal Transmission Control Module Watchdog Plausibility Error
DTC P171E meaning on BMW
The DTC P171E on BMW vehicles indicates an Internal Transmission Control Module Watchdog Plausibility Error. This fault code is related to a discrepancy detected by the transmission control module’s internal monitoring system.
BMW DTC P171E symptoms
Symptoms of the BMW DTC P171E may include erratic shifting behavior, transmission slipping, harsh shifting, or the transmission going into limp mode. The vehicle may also display a warning light on the dashboard indicating a transmission fault.
BMW DTC P171E causes
The DTC P171E on BMW can be triggered by various factors, including faulty transmission control module software, internal module hardware issues, wiring problems, or sensor malfunctions. It can also be caused by low transmission fluid levels or contaminated fluid.
BMW DTC P171E seriousness
The DTC P171E is a serious fault code that should not be ignored. Ignoring this fault can lead to further damage to the transmission system and potentially result in costly repairs. It is recommended to address this issue promptly to prevent any long-term damage.
How to diagnose DTC P171E on BMW
To diagnose the DTC P171E on a BMW, a diagnostic scan tool capable of reading transmission fault codes is required. The technician will need to retrieve the fault code, perform a visual inspection of the transmission system, check the transmission fluid level and condition, and conduct further testing to pinpoint the exact cause of the issue.
How to fix DTC P171E on BMW
Fixing the DTC P171E on a BMW may involve updating the transmission control module software, repairing or replacing faulty wiring or sensors, addressing internal module hardware issues, or performing a transmission fluid flush and filter replacement. It is recommended to consult with a qualified mechanic or dealership to accurately diagnose and repair the issue.
How to erase DTC P171E on BMW
Once the underlying issue causing the DTC P171E on a BMW has been resolved, the fault code can be cleared using a diagnostic scan tool. The technician can access the fault code menu, select the DTC P171E, and choose to clear the code. After clearing the code, it is advisable to test drive the vehicle to ensure the fault does not reoccur.
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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