AutoCodes – Nissan – P2851 Nissan

P2851 Nissan 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 Common causes include Outdated Transmission Control Module (TCM) program (Reprogram TCM), Faulty Transmission Control Module (TCM), Faulty Transmission Assembly.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 Nissan 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Common causes: Common causes include Outdated Transmission Control Module (TCM) program (Reprogram TCM), Faulty Transmission Control Module (TCM), Faulty Transmission Assembly.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 6,250

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

What does this mean?

What are the Possible Causes of the DTC P2851 Nissan?

Outdated Transmission Control Module (TCM) program (Reprogram TCM)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

How to Fix the DTC P2851 Nissan?

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 Nissan 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 Nissan Code

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

- Common symptoms include difficulty shifting gears, hesitation or jerking during acceleration, and illuminated check engine light.

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

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

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

- Possible causes include a faulty shift fork position sensor, damaged wiring or connectors, transmission fluid issues, or internal transmission problems.

4. How can I diagnose the OBDII code P2851 in my Nissan?

- Diagnosis typically involves using a scan tool to retrieve the code, inspecting the shift fork position sensors, checking for wiring or connector damage, and testing the transmission system.

5. Can I drive my Nissan with OBDII code P2851?

- It is not recommended to drive your vehicle with this code as it can lead to further transmission damage and potential safety hazards.

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

- Repair options may include replacing the faulty shift fork position sensor, repairing damaged wiring or connectors, performing a transmission fluid flush, or seeking professional help for internal transmission repairs.

7. Is it possible to reset the OBDII code P2851 in a Nissan without fixing the issue?

- While you can clear the code temporarily, it is essential to address the underlying problem to prevent further damage and ensure proper vehicle operation.

8. Are there any preventative maintenance tips to avoid OBDII code P2851 in a Nissan?

- Regularly servicing the transmission system, checking for fluid leaks, and addressing any shifting issues promptly can help prevent the occurrence of this code.

9. How serious is OBDII code P2851 in a Nissan?

- This code should be taken seriously as it can impact the vehicle's drivability and lead to potential transmission failure if left unresolved.

10. Can a DIY enthusiast fix OBDII code P2851 in a Nissan?

- Depending on the level of expertise and access to tools, some DIY enthusiasts may be able to address this code, but professional diagnosis and repair are recommended for complex transmission issues.