BMW DTC P120C – Crankcase Ventilation Diagnostic Valve Open Circuit
DTC P120C meaning on BMW
DTC P120C on a BMW indicates a fault with the Crankcase Ventilation Diagnostic Valve Open Circuit. This means that the engine control module (ECM) has detected an open circuit in the diagnostic valve responsible for managing the crankcase ventilation system.
BMW DTC P120C symptoms
Common symptoms associated with BMW DTC P120C may include rough idling, decreased engine performance, increased fuel consumption, and the illumination of the check engine light on the dashboard.
BMW DTC P120C causes
The potential causes of BMW DTC P120C can include a faulty diagnostic valve, damaged wiring or connectors related to the valve, or issues with the ECM itself.
BMW DTC P120C seriousness
While the vehicle may still be operable with DTC P120C, it is important to address the issue promptly to prevent further damage to the engine and ensure optimal performance and fuel efficiency.
How to diagnose DTC P120C on BMW
To diagnose DTC P120C on a BMW, a mechanic would typically use a diagnostic scanner to retrieve the fault codes stored in the ECM. They would then inspect the diagnostic valve, wiring, and connectors for any visible damage or issues.
How to fix DTC P120C on BMW
To fix DTC P120C on a BMW, the faulty diagnostic valve may need to be replaced. Additionally, any damaged wiring or connectors should be repaired or replaced as necessary. Once the repairs are completed, the fault codes can be cleared from the ECM.
How to erase DTC P120C on BMW
To erase DTC P120C on a BMW, a mechanic can use a diagnostic scanner to clear the fault codes stored in the ECM. After the repairs have been made and the issue resolved, clearing the fault codes will reset the check engine light and ensure that the system is functioning properly.
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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