P077B
Output Shaft Speed Sensor Circuit - Direction Error
P077B is an OBD-II diagnostic trouble code meaning: Output Shaft Speed Sensor Circuit - Direction Error. Common causes: output shaft speed sensor malfunction, damaged or corroded wiring. Estimated repair cost: $17–56.
Symptoms
- Incorrect gear shifting
- Transmission transition to emergency mode
- Check Engine light comes on
- Reduced transmission efficiency
- Possible jerking when changing gears
Causes
- Output shaft speed sensor malfunction
- Damaged or corroded wiring
- Poor contact in connectors
- Transmission Control Module (TCM) Problems
- Mechanical damage to the sensor or related components
How to Fix
- Check the condition of the output shaft speed sensor
- Inspect wiring and connectors for damage
- Check resistance and sensor signal
- Replace sensor if necessary
- Scan the system for other errors
Related codes
Error P077B by Vehicle Brand
FAQ
What does the P077B code mean?
P077B is an OBD-II diagnostic trouble code that indicates: Output Shaft Speed Sensor Circuit - Direction Error
What causes a P077B error code?
The most common causes of P077B include: Output shaft speed sensor malfunction; Damaged or corroded wiring; Poor contact in connectors; Transmission Control Module (TCM) Problems.
How do I fix a P077B diagnostic trouble code?
To fix P077B: Check the condition of the output shaft speed sensor. Inspect wiring and connectors for damage. Check resistance and sensor signal. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P077B?
Limited driving only, diagnose soon
How much does it cost to fix P077B?
The estimated repair cost for P077B is $17–56. Actual cost depends on your vehicle, location, and labor rates.
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