BMW DTC P174B – Shift Solenoid ‘A’/’B’ Circuit Low
DTC P174B meaning on BMW
DTC P174B indicates a fault with the Shift Solenoid ‘A’/’B’ Circuit Low in a BMW vehicle. This fault code is specific to the transmission system and points towards an issue with the electrical circuit associated with the shift solenoids.
BMW DTC P174B symptoms
Symptoms of DTC P174B in a BMW may include harsh shifting, delayed shifting, transmission slipping, or the transmission going into limp mode. The vehicle may also experience decreased fuel efficiency and overall performance issues.
BMW DTC P174B causes
The common causes of DTC P174B in a BMW include a faulty shift solenoid, damaged wiring or connectors in the shift solenoid circuit, low transmission fluid level, or a malfunctioning transmission control module (TCM).
BMW DTC P174B seriousness
Ignoring DTC P174B in a BMW can lead to further damage to the transmission system, potentially resulting in costly repairs. It is important to address this issue promptly to prevent any long-term damage to the vehicle.
How to diagnose DTC P174B on BMW
To diagnose DTC P174B on a BMW, a mechanic would typically use a diagnostic scanner to retrieve the fault code and perform a thorough inspection of the shift solenoid ‘A’/’B’ circuit. This may involve checking the wiring, connectors, and the shift solenoid itself for any signs of damage or malfunction.
How to fix DTC P174B on BMW
Fixing DTC P174B on a BMW may involve replacing the faulty shift solenoid, repairing any damaged wiring or connectors, ensuring the transmission fluid level is correct, and resetting the TCM if necessary. It is recommended to follow the manufacturer’s repair procedures or seek assistance from a qualified mechanic.
How to erase DTC P174B on BMW
Once the underlying issue causing DTC P174B has been resolved, the fault code can be erased using a diagnostic scanner. This will clear the code from the vehicle’s memory and turn off the check engine light. It is important to ensure that the repair has been successful before clearing the fault 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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