P077B

Output Shaft Speed Sensor Circuit - Direction Error

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$17–56 (est.)

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

P077A P077C P077D