BMW DTC P137A – Knock Control Super Knocking Caused by Defective Ignition Coil
DTC P137A meaning on BMW
DTC P137A on a BMW refers to Knock Control Super Knocking Caused by Defective Ignition Coil. This diagnostic trouble code indicates that the engine control module (ECM) has detected excessive knocking or detonation in the engine due to a faulty ignition coil.
BMW DTC P137A symptoms
Symptoms of DTC P137A 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 P137A causes
The primary cause of DTC P137A on a BMW is a defective ignition coil. The ignition coil is responsible for generating the high voltage needed to ignite the air-fuel mixture in the engine cylinders. When the ignition coil fails, it can lead to misfires and abnormal combustion, resulting in knocking or detonation.
BMW DTC P137A seriousness
Ignoring DTC P137A on a BMW can lead to potential engine damage over time. Knocking or detonation can cause piston damage, cylinder head damage, and other internal engine components to wear prematurely. It is essential to address this issue promptly to prevent further damage.
How to diagnose DTC P137A on BMW
To diagnose DTC P137A on a BMW, a mechanic would typically use a diagnostic scan tool to retrieve the fault codes stored in the ECM. They would then perform a visual inspection of the ignition coil and related components for any signs of damage or wear. Additionally, conducting a thorough ignition system test may help pinpoint the faulty component.
How to fix DTC P137A on BMW
To fix DTC P137A on a BMW, the defective ignition coil responsible for the super knocking must be replaced. It is recommended to use OEM or high-quality aftermarket ignition coils to ensure proper engine performance and reliability. After replacing the faulty component, the ECM should be cleared of fault codes and the vehicle test-driven to verify the repair.
How to erase DTC P137A on BMW
Erasing DTC P137A on a BMW can be done using a diagnostic scan tool capable of clearing fault codes. Once the faulty ignition coil has been replaced and the repair verified, the mechanic can use the scan tool to erase the DTC P137A code from the ECM’s memory. This will reset the Check Engine Light and ensure that the issue 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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