BMW DTC P137D – Knock Control Torque Limitation Caused by Too High Number of Super Knocking
DTC P137D meaning on BMW
DTC P137D on a BMW refers to Knock Control Torque Limitation Caused by Too High Number of Super Knocking. This diagnostic trouble code indicates that the engine control module (ECM) has detected excessive super knocking, leading to a reduction in engine torque to prevent potential engine damage.
BMW DTC P137D symptoms
Symptoms of DTC P137D on a BMW may include engine knocking or pinging noises, reduced engine power or performance, illuminated check engine light (MIL), and potential rough idling or hesitation during acceleration.
BMW DTC P137D causes
The primary cause of DTC P137D on a BMW is an excessive number of super knocking events, which can be triggered by factors such as poor fuel quality, incorrect ignition timing, carbon buildup in the combustion chamber, or a malfunctioning knock sensor.
BMW DTC P137D seriousness
DTC P137D should be taken seriously as it can lead to engine damage if left unresolved. The torque limitation imposed by the ECM is a protective measure to prevent catastrophic engine failure due to detonation or pre-ignition events.
How to diagnose DTC P137D on BMW
To diagnose DTC P137D 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 thorough inspection of the ignition system, fuel quality, knock sensor operation, and engine timing to identify the root cause of the super knocking events.
How to fix DTC P137D on BMW
Fixing DTC P137D on a BMW may involve addressing the underlying causes of super knocking. This can include using high-quality fuel, cleaning carbon deposits from the combustion chamber, adjusting ignition timing, replacing faulty knock sensors, or updating the ECM software to optimize engine performance.
How to erase DTC P137D on BMW
To erase DTC P137D on a BMW, the fault codes can be cleared using a diagnostic scan tool. After addressing the root cause of the super knocking events and ensuring the issue has been resolved, the ECM can be reset to clear the fault code and turn off the check engine light.
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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