BMW DTC P108E – Idle Air Control System in H2 Operation RPM Lower Than Expected
DTC P108E meaning on BMW
DTC P108E in a BMW indicates an issue with the Idle Air Control (IAC) system during H2 operation, where the engine’s RPM is lower than expected. The IAC system is responsible for controlling the engine’s idle speed by regulating the amount of air entering the engine.
BMW DTC P108E symptoms
Symptoms of DTC P108E in a BMW may include rough idling, stalling at idle, fluctuating idle speed, poor acceleration, and potentially an illuminated check engine light on the dashboard.
BMW DTC P108E causes
The causes of DTC P108E in a BMW can vary and may include a faulty idle air control valve, vacuum leaks, dirty throttle body, malfunctioning throttle position sensor, or issues with the engine’s air intake system.
BMW DTC P108E seriousness
While DTC P108E may not cause immediate harm to the engine, it can lead to poor performance, reduced fuel efficiency, and potential drivability issues. It is recommended to address this issue promptly to prevent further complications.
How to diagnose DTC P108E on BMW
To diagnose DTC P108E on a BMW, a mechanic would typically use a diagnostic scanner to retrieve the trouble codes stored in the vehicle’s computer. They would then perform a visual inspection of the idle air control system components, check for vacuum leaks, test the throttle position sensor, and conduct a thorough inspection of the air intake system.
How to fix DTC P108E on BMW
Fixing DTC P108E on a BMW may involve cleaning or replacing the idle air control valve, repairing any vacuum leaks, cleaning the throttle body, replacing the throttle position sensor if necessary, and ensuring proper functioning of the air intake system components.
How to erase DTC P108E on BMW
Once the underlying issue causing DTC P108E has been addressed and fixed, the trouble codes can be erased using a diagnostic scanner. This will reset the check engine light and allow the vehicle to undergo a drive cycle to ensure the problem has been resolved.
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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