BMW DTC P137E – Knock Control Permanent Torque Limitation Caused by Too High Number of Super Knocking
DTC P137E meaning on BMW
DTC P137E on a BMW refers to Knock Control Permanent 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 permanent torque limitation being imposed to protect the engine from potential damage.
BMW DTC P137E symptoms
Symptoms of BMW DTC P137E may include reduced engine power, rough idling, engine knocking or pinging noises, decreased fuel efficiency, and in some cases, the vehicle may go into a limp mode where it operates at reduced performance levels.
BMW DTC P137E causes
The causes of BMW DTC P137E can vary, but common factors include poor fuel quality, incorrect ignition timing, carbon buildup in the combustion chamber, faulty knock sensors, or issues with the engine’s air-fuel mixture.
BMW DTC P137E seriousness
Ignoring or neglecting BMW DTC P137E can lead to potential engine damage over time. The permanent torque limitation imposed by the ECM is a protective measure to prevent further harm, but addressing the underlying cause promptly is crucial to avoid more severe issues.
How to diagnose DTC P137E on BMW
To diagnose DTC P137E on a BMW, a mechanic would typically use a diagnostic scanner to retrieve the fault codes stored in the ECM. They would then perform a thorough inspection of the engine components, including the knock sensors, ignition system, fuel system, and engine timing to identify the root cause of the super knocking.
How to fix DTC P137E on BMW
Fixing BMW DTC P137E involves addressing the underlying cause of the super knocking. This may include replacing faulty knock sensors, cleaning carbon deposits from the combustion chamber, adjusting ignition timing, using higher-quality fuel, or correcting any issues with the air-fuel mixture. Once the root cause is identified and resolved, the ECM may need to be reset to clear the fault code.
How to erase DTC P137E on BMW
To erase DTC P137E on a BMW, the underlying issue causing the super knocking must first be resolved. Once the necessary repairs have been made, a mechanic can use a diagnostic scanner to clear the fault code from the ECM’s memory. This will reset the system and allow the vehicle to operate without the permanent torque limitation caused by excessive super knocking.
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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