BMW DTC P0720 – Output Shaft Speed Sensor Circuit
DTC P0720 meaning on BMW
DTC P0720 on a BMW indicates a fault with the Output Shaft Speed Sensor Circuit. This sensor is responsible for monitoring the speed of the output shaft of the transmission. The Engine Control Module (ECM) uses this information to control various functions such as shift points and torque converter lockup.
BMW DTC P0720 symptoms
Symptoms of a DTC P0720 on a BMW may include erratic shifting, delayed or harsh shifting, transmission slipping, and in some cases, the transmission may go into a fail-safe mode. The Check Engine Light may also be illuminated on the dashboard.
BMW DTC P0720 causes
The common causes of a DTC P0720 on a BMW include a faulty output shaft speed sensor, damaged wiring or connectors in the sensor circuit, or a malfunctioning ECM. Additionally, low transmission fluid levels or contaminated fluid can also trigger this fault code.
BMW DTC P0720 seriousness
Ignoring a DTC P0720 on a BMW can lead to further damage to the transmission and drivability issues. It is important to address this fault code promptly to prevent potential transmission failure and costly repairs.
How to diagnose DTC P0720 on BMW
To diagnose a DTC P0720 on a BMW, a mechanic would typically start by using a diagnostic scanner to retrieve the fault code and perform a visual inspection of the output shaft speed sensor and its wiring. They may also test the sensor’s resistance and check for proper voltage signals. If necessary, further testing of the sensor and circuit may be required.
How to fix DTC P0720 on BMW
Fixing a DTC P0720 on a BMW usually involves replacing the faulty output shaft speed sensor. The mechanic may also need to repair or replace any damaged wiring or connectors in the sensor circuit. It is essential to use genuine BMW parts to ensure proper functionality and compatibility.
How to erase DTC P0720 on BMW
Once the underlying issue causing the DTC P0720 on a BMW has been resolved, the fault code can be cleared using a diagnostic scanner. This will reset the Check Engine Light and allow the ECM to reevaluate the system. It is important to verify that the fault does not return after clearing the code.
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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