BMW DTC P2339 – Cylinder 4 Above Knock/Combustion Vibration Sensor Threshold
DTC P2339 meaning on BMW
DTC P2339 on a BMW indicates that the Engine Control Module (ECM) has detected that the signal from the knock sensor for cylinder 4 has exceeded the threshold for allowable knock or combustion vibration. This means that the sensor has detected abnormal combustion in cylinder 4, which can lead to engine performance issues.
BMW DTC P2339 symptoms
Symptoms of DTC P2339 on a BMW may include engine knocking or pinging noises, reduced engine power, rough idling, decreased fuel efficiency, and in some cases, the Check Engine Light may illuminate on the dashboard.
BMW DTC P2339 causes
The common causes of DTC P2339 on a BMW include a faulty knock sensor, wiring issues in the knock sensor circuit, engine mechanical problems such as carbon buildup in cylinder 4, or issues with the fuel system affecting combustion in that cylinder.
BMW DTC P2339 seriousness
Ignoring DTC P2339 on a BMW can lead to potential engine damage, reduced fuel efficiency, and poor engine performance. It is important to address this issue promptly to prevent further complications.
How to diagnose DTC P2339 on BMW
To diagnose DTC P2339 on a BMW, a mechanic would typically use a diagnostic scanner to retrieve the fault codes and perform a thorough inspection of the knock sensor for cylinder 4, check the wiring for any damage or loose connections, and inspect the combustion in cylinder 4 for any abnormalities.
How to fix DTC P2339 on BMW
Fixing DTC P2339 on a BMW may involve replacing the knock sensor for cylinder 4, repairing any damaged wiring in the knock sensor circuit, addressing any engine mechanical issues affecting cylinder 4, and ensuring proper functioning of the fuel system components related to that cylinder.
How to erase DTC P2339 on BMW
Once the underlying issue causing DTC P2339 on a BMW has been resolved, the fault codes can be cleared using a diagnostic scanner. This will erase the DTC P2339 code from the ECM’s memory and turn off the Check Engine Light on the dashboard.
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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