BMW DTC P117B – VVL-Relay Circuit Low (Bank 2)
DTC P117B meaning on BMW
DTC P117B on a BMW refers to a fault in the Variable Valve Lift (VVL) relay circuit on Bank 2. This diagnostic trouble code indicates that the engine control module (ECM) has detected a low voltage condition in the VVL relay circuit for Bank 2.
BMW DTC P117B symptoms
Symptoms of DTC P117B on a BMW may include rough idling, reduced engine performance, hesitation during acceleration, and in some cases, the Check Engine Light may illuminate on the dashboard.
BMW DTC P117B causes
The common causes of DTC P117B on a BMW include a faulty VVL relay, damaged wiring or connectors in the VVL relay circuit, or a malfunctioning ECM.
BMW DTC P117B seriousness
While DTC P117B may not cause immediate drivability issues, it is important to address this fault promptly to prevent potential engine performance issues and further damage to engine components.
How to diagnose DTC P117B on BMW
To diagnose DTC P117B 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 VVL relay and its circuit for any visible damage, test the relay for proper operation, and check the wiring and connectors for continuity and proper voltage levels.
How to fix DTC P117B on BMW
To fix DTC P117B on a BMW, the faulty VVL relay may need to be replaced, and any damaged wiring or connectors in the VVL relay circuit should be repaired or replaced. Additionally, the ECM may need to be reprogrammed or replaced if deemed necessary.
How to erase DTC P117B on BMW
Once the underlying issue causing DTC P117B on a BMW has been resolved, the fault codes can be cleared using a diagnostic scanner. This will reset the Check Engine Light and erase the DTC P117B code from the ECM’s memory.
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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