BMW DTC P172B – Internal Transmission Control Module Level 2 Error, Interference Counter 2 above Threshold
DTC P172B meaning on BMW
The DTC P172B on a BMW indicates an Internal Transmission Control Module Level 2 Error, with Interference Counter 2 above the threshold. This error code is specific to the transmission control module and signifies a fault related to the transmission system.
BMW DTC P172B symptoms
Symptoms of the DTC P172B on a BMW may include harsh shifting, transmission slipping, delayed engagement, erratic shifting patterns, 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 P172B causes
The DTC P172B on a BMW can be caused by various factors such as a faulty transmission control module, wiring issues, sensor malfunctions, internal transmission faults, or software glitches within the control module.
BMW DTC P172B seriousness
The seriousness of the DTC P172B on a BMW lies in the fact that it directly affects the transmission system. Ignoring this error code can lead to further damage to the transmission components and may result in costly repairs if not addressed promptly.
How to diagnose DTC P172B on BMW
To diagnose the DTC P172B on a BMW, a professional diagnostic scanner capable of reading transmission fault codes is required. The technician will perform a thorough scan of the transmission control module to pinpoint the exact cause of the error code.
How to fix DTC P172B on BMW
Fixing the DTC P172B on a BMW involves addressing the root cause of the issue. This may include repairing or replacing the transmission control module, fixing wiring issues, replacing faulty sensors, or performing software updates to rectify any glitches within the system.
How to erase DTC P172B on BMW
Once the underlying issue causing the DTC P172B on a BMW has been resolved, the error code can be erased using a diagnostic scanner. The technician can clear the code from the transmission control module’s memory, and if the problem has been successfully fixed, the code should 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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