P077A
Output Shaft Speed Sensor Circuit - Loss of Direction Signal
P077A is an OBD-II diagnostic trouble code meaning: Output Shaft Speed Sensor Circuit - Loss of Direction Signal. Common causes: output shaft speed sensor malfunction, open or short circuit in the sensor circuit. Estimated repair cost: $17–56.
Symptoms
- Incorrect gear shifting
- Check engine light comes on
- Switching to emergency mode of the gearbox
- Power Loss
- Jerks when shifting gears
Causes
- Output shaft speed sensor malfunction
- Open or short circuit in the sensor circuit
- Damage to the sensor connector
- Problems with the transmission control unit
- Mechanical damage to the output shaft
How to Fix
- Check the condition of the output shaft speed sensor
- Check the integrity of the sensor circuit and connectors
- Check sensor resistance
- Check the sensor signal with an oscilloscope
- Replace sensor if necessary
Related codes
Error P077A by Vehicle Brand
FAQ
What does the P077A code mean?
P077A is an OBD-II diagnostic trouble code that indicates: Output Shaft Speed Sensor Circuit - Loss of Direction Signal
What causes a P077A error code?
The most common causes of P077A include: Output shaft speed sensor malfunction; Open or short circuit in the sensor circuit; Damage to the sensor connector; Problems with the transmission control unit.
How do I fix a P077A diagnostic trouble code?
To fix P077A: Check the condition of the output shaft speed sensor. Check the integrity of the sensor circuit and connectors. Check sensor resistance. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P077A?
Limited driving only, diagnose soon
How much does it cost to fix P077A?
The estimated repair cost for P077A is $17–56. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat