P2851

Shift Fork Position Sensor A/B Correlation

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$17–56 (est.)

Symptoms

Incorrect gear shifting
Hard or abrupt shifts
The gearbox goes into emergency mode
Check Engine light comes on
Loss of power or jerking when shifting

Causes

Shift fork position sensor A or B faulty
Damage to the wiring harness or sensor connectors
Mechanical damage to shift forks
Transmission Control Module (TCM) Problems
Contamination or corrosion of sensor contacts

How to Fix

Check the condition of the shift fork position sensors
Inspect the wiring harness and connectors for damage.
Clean the sensor contacts from dirt and corrosion
Check the mechanical condition of the shift forks
Scan the transmission control module for errors

Related codes

P2850 P2852 P2853