BMW DTC P17AC – Internal Transmission Control Module Watchdog Output Stage Error
DTC P17AC meaning on BMW
The DTC P17AC code on a BMW indicates an Internal Transmission Control Module Watchdog Output Stage Error. This error occurs when the transmission control module detects a fault in the output stage of its internal watchdog system.
BMW DTC P17AC symptoms
Symptoms of the BMW DTC P17AC code may include:
- Transmission shifting issues
- Reduced performance
- Warning lights on the dashboard
BMW DTC P17AC causes
Common causes of the BMW DTC P17AC code are:
- Faulty transmission control module
- Electrical issues in the transmission system
- Software glitches
BMW DTC P17AC seriousness
The DTC P17AC code should be addressed promptly as it can lead to further transmission problems if left unresolved. Ignoring this issue may result in more severe damage to the transmission system.
How to diagnose DTC P17AC on BMW
To diagnose the DTC P17AC code on a BMW, a mechanic may:
- Use a diagnostic scanner to retrieve the fault codes
- Inspect the transmission control module for any visible damage
- Check the wiring and connectors for any signs of wear or corrosion
How to fix DTC P17AC on BMW
To fix the DTC P17AC code on a BMW, the following steps may be taken:
- Replace the faulty transmission control module
- Repair any damaged wiring or connectors in the transmission system
- Update the software of the transmission control module
How to erase DTC P17AC on BMW
After fixing the underlying issue causing the DTC P17AC code, the code can be erased using a diagnostic scanner. The scanner can clear the fault codes stored in the system, resetting the transmission control module.
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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