BMW DTC P077D – Output Shaft Speed Sensor Circuit High
DTC P077D meaning on BMW
DTC P077D on a BMW refers to a fault with the Output Shaft Speed Sensor Circuit registering a high signal. The Output Shaft Speed Sensor is responsible for monitoring the speed of the output shaft of the transmission. When the sensor detects a high signal, it indicates an issue with the sensor circuit or the sensor itself.
BMW DTC P077D symptoms
Symptoms of DTC P077D on a BMW may include erratic shifting behavior, transmission slipping, harsh shifting, or the transmission going into limp mode. The vehicle’s onboard diagnostic system may also illuminate the Check Engine Light to alert the driver of a problem.
BMW DTC P077D causes
The causes of DTC P077D on a BMW can vary and may include a faulty Output Shaft Speed Sensor, damaged wiring or connectors in the sensor circuit, or issues with the transmission control module. Additionally, low transmission fluid levels or contaminated fluid can also trigger this fault code.
BMW DTC P077D seriousness
DTC P077D should be taken seriously as it can lead to drivability issues and potential damage to the transmission if left unresolved. Ignoring this fault code may result in further transmission problems and could compromise the safety and performance of the vehicle.
How to diagnose DTC P077D on BMW
To diagnose DTC P077D on a BMW, a mechanic would typically start by using a diagnostic scan tool to retrieve the fault code and any related data. They would then inspect the Output Shaft Speed Sensor and its circuit for any visible damage or corrosion. Testing the sensor’s resistance and checking the wiring for continuity can help pinpoint the issue.
How to fix DTC P077D on BMW
Fixing DTC P077D on a BMW may involve replacing the Output Shaft Speed Sensor if it is found to be faulty. Repairing or replacing damaged wiring or connectors in the sensor circuit is also necessary. Ensuring the transmission fluid is at the correct level and in good condition is important. If the fault lies with the transmission control module, it may need to be reprogrammed or replaced.
How to erase DTC P077D on BMW
Once the underlying issue causing DTC P077D on a BMW has been resolved, the fault code can be cleared using a diagnostic scan tool. This will reset the Check Engine Light and erase the code from the vehicle’s memory. It is important to verify that the repair was successful by driving the vehicle and rescanning for any remaining fault codes.
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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