BMW DTC P1381 – Control Module Self-Test, Knock Control Offset (Bank 1)
DTC P1381 meaning on BMW
DTC P1381 on a BMW refers to the Control Module Self-Test, Knock Control Offset (Bank 1). This diagnostic trouble code indicates that there is an issue with the knock control system on Bank 1 of the engine.
BMW DTC P1381 symptoms
Symptoms of DTC P1381 on a BMW may include engine knocking or pinging noises, reduced engine performance, rough idling, and in some cases, the Check Engine Light may illuminate on the dashboard.
BMW DTC P1381 causes
The causes of DTC P1381 on a BMW can vary, but common reasons include a faulty knock sensor, wiring issues in the knock sensor circuit, or problems with the engine control module (ECM).
BMW DTC P1381 seriousness
While DTC P1381 may not always result in immediate engine failure, it is important to address this issue promptly as it can lead to reduced engine performance and potential long-term damage if left unresolved.
How to diagnose DTC P1381 on BMW
To diagnose DTC P1381 on a BMW, a mechanic would typically use a diagnostic scanner to retrieve the fault codes stored in the vehicle’s ECM. They would then inspect the knock sensor and its wiring for any visible damage or corrosion. Additionally, testing the knock sensor’s resistance and checking the ECM for proper operation may be necessary.
How to fix DTC P1381 on BMW
Fixing DTC P1381 on a BMW may involve replacing the faulty knock sensor, repairing any damaged wiring in the knock sensor circuit, or reprogramming the engine control module if necessary. It is recommended to follow the manufacturer’s diagnostic and repair procedures to ensure a proper fix.
How to erase DTC P1381 on BMW
Once the underlying issue causing DTC P1381 on a BMW has been resolved, the fault codes can be cleared using a diagnostic scanner. By clearing the fault codes, the Check Engine Light should turn off, indicating that the issue has been addressed.
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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