P077C – BMW DTC

BMW DTC P077C – Output Shaft Speed Sensor Circuit Low

DTC P077C meaning on BMW

DTC P077C on a BMW indicates a fault with the Output Shaft Speed Sensor Circuit being detected as low. The Output Shaft Speed Sensor is responsible for monitoring the speed of the output shaft of the transmission. When the sensor circuit is reading a low signal, it suggests a potential issue with the sensor itself or the wiring connected to it.

BMW DTC P077C symptoms

Symptoms of DTC P077C on a BMW may include:

• Check Engine Light illuminated on the dashboard
• Transmission shifting irregularly or harshly
• Loss of power or acceleration
• Transmission slipping

BMW DTC P077C causes

Common causes of DTC P077C on a BMW include:

• Defective Output Shaft Speed Sensor
• Faulty wiring or connectors in the sensor circuit
• Corrosion or poor connections in the sensor circuit

BMW DTC P077C seriousness

DTC P077C should be addressed promptly as it can lead to drivability issues and potential damage to the transmission if left unresolved. Ignoring this fault may result in further complications and costly repairs.

How to diagnose DTC P077C on BMW

To diagnose DTC P077C on a BMW, follow these steps:

1. Use a diagnostic scanner to retrieve the fault code and related data
2. Inspect the Output Shaft Speed Sensor and its wiring for any visible damage or corrosion
3. Test the sensor’s resistance and voltage output to determine if it is functioning correctly
4. Check for any loose or damaged connections in the sensor circuit

How to fix DTC P077C on BMW

To fix DTC P077C on a BMW, consider the following:

1. Replace the Output Shaft Speed Sensor if it is found to be faulty
2. Repair or replace any damaged wiring or connectors in the sensor circuit
3. Clean any corrosion from the connections and ensure they are secure

How to erase DTC P077C on BMW

To erase DTC P077C on a BMW, you can:

1. Use a diagnostic scanner to clear the fault code after the repair has been completed
2. Drive the vehicle to allow the system to recheck and confirm 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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