AutoCodes – Ford – P2851 Ford

P2851 Ford Code - Shift Fork Position Sensor 'A'/'B' Correlation

Quick Answer

There are two electric motors used to shift the gears in the transmission, on for gears 1-3-5 and one for gears R-2-4-6. Common causes include Outdated Transmission Control Module (TCM) program (Reprogram TCM), Faulty Transmission Control Module (TCM), Faulty Transmission Assembly. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P2851 Ford indicates Shift Fork Position Sensor 'A'/'B' Correlation.
Common causes: Common causes include Outdated Transmission Control Module (TCM) program (Reprogram TCM), Faulty Transmission Control Module (TCM), Faulty Transmission Assembly.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 1,421

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Feb 16, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2851 Ford Description

There are two electric motors used to shift the gears in the transmission, on for gears 1-3-5 and one for gears R-2-4-6. The gear shifting is made by two shift drums connected to shift motor pinion via two ideal gears. The maximum shift force is 1500N (337 lb). The motors are integrated in the Transmission Control Module (TCM) and work independently of each other.

OBDII Code P2851 Ford - Shift Fork Position Sensor 'A'/'B' Correlation - AutoCodes.com — P2851 Ford Code - Shift Fork Position Sensor 'A'/'B' Correlation

What does this mean?

What are the Possible Causes of the DTC P2851 Ford?

Outdated Transmission Control Module (TCM) program (Reprogram TCM)
Faulty Transmission Control Module (TCM)
Faulty Transmission Assembly

How to Fix the DTC P2851 Ford?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2851 Ford code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P2851 Ford Code

1. What are the common symptoms of OBDII code P2851 in a Ford vehicle?

- Common symptoms include difficulty shifting gears, erratic shifting, transmission slippage, and the transmission going into limp mode.

2. What does the OBDII code P2851 Shift Fork Position Sensor 'A'/'B' Correlation indicate in a Ford?

- This code indicates a problem with the correlation between the shift fork position sensors 'A' and 'B' in the transmission.

3. What are the possible causes of OBDII code P2851 in a Ford?

- The code can be triggered by faulty shift fork position sensors, damaged wiring or connectors, low transmission fluid levels, or internal transmission issues.

4. How can I diagnose the Shift Fork Position Sensor 'A'/'B' Correlation issue in my Ford?

- Diagnosis typically involves using a scan tool to retrieve the code, checking the shift fork position sensor readings, inspecting the wiring and connectors, and testing the transmission fluid level and condition.

5. Can I continue driving my Ford with OBDII code P2851 present?

- It is not recommended to drive the vehicle with this code present, as it can lead to further transmission damage and potentially unsafe driving conditions.

6. How can I repair OBDII code P2851 in my Ford?

- Repair options may include replacing the faulty shift fork position sensors, repairing or replacing damaged wiring, ensuring proper transmission fluid levels, and addressing any internal transmission issues.

7. Is it possible to reset the OBDII code P2851 in a Ford without addressing the underlying issue?

- While you can clear the code with a scan tool, it is crucial to address the root cause of the problem to prevent it from recurring and causing further damage.

8. Can a DIY enthusiast fix OBDII code P2851 in a Ford, or is professional help recommended?

- Depending on your mechanical skills and knowledge, you may be able to address this issue yourself. However, due to the complexity of transmission systems, professional help is often recommended.

9. How much does it typically cost to repair OBDII code P2851 in a Ford at a repair shop?

- The cost of repairs can vary significantly depending on the underlying issue, parts needed, and labor rates. It is advisable to get quotes from different repair shops for an accurate estimate.

10. Are there any preventive maintenance measures to avoid encountering OBDII code P2851 in a Ford?

- Regularly servicing the transmission, checking fluid levels, addressing any leaks promptly, and ensuring the shift fork position sensors are in good condition can help prevent this issue.