P2851
Shift Fork Position Sensor A/B Correlation
P2851 is an OBD-II diagnostic trouble code meaning: Shift Fork Position Sensor A/B Correlation. Common causes: shift fork position sensor a or b faulty, damage to the wiring harness or sensor connectors. Estimated repair cost: $17–56.
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
Error P2851 by Vehicle Brand
FAQ
What does the P2851 code mean?
P2851 is an OBD-II diagnostic trouble code that indicates: Shift Fork Position Sensor A/B Correlation
What causes a P2851 error code?
The most common causes of P2851 include: 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.
How do I fix a P2851 diagnostic trouble code?
To fix P2851: 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. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P2851?
Limited driving only, diagnose soon
How much does it cost to fix P2851?
The estimated repair cost for P2851 is $17–56. Actual cost depends on your vehicle, location, and labor rates.
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