AutoCodes – Nissan – P2840 Nissan

P2840 Nissan Code - Shift Fork 'D' Position Circuit

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 Common causes include Outdated Transmission Control Module (TCM) program (Reprogram TCM), Faulty Transmission Control Module (TCM), Faulty Transmission Assembly.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: P2840 Nissan indicates Shift Fork 'D' Position Circuit.
Common causes: Common causes include Outdated Transmission Control Module (TCM) program (Reprogram TCM), Faulty Transmission Control Module (TCM), Faulty Transmission Assembly.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 1,510

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 P2840 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 P2840 Nissan - Shift Fork 'D' Position Circuit - AutoCodes.com — P2840 Nissan Code - Shift Fork 'D' Position Circuit

What does this mean?

What are the Possible Causes of the DTC P2840 Nissan?

Outdated Transmission Control Module (TCM) program (Reprogram TCM)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

How to Fix the DTC P2840 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 P2840 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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Need more information on how to fix the P2840 Nissan code? Get Access to Factory Service Manuals

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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 P2840 Nissan Code

What does the OBDII code P2840 mean for a Nissan vehicle?

The OBDII code P2840 indicates a problem with the Shift Fork 'D' Position Circuit, which affects the transmission's ability to properly shift gears.

What are common symptoms of the P2840 code?

Common symptoms include transmission shifting issues, erratic gear changes, warning lights on the dashboard, or the vehicle entering limp mode.

What could cause the P2840 code to trigger?

Causes may include a faulty shift fork position sensor, damaged wiring or connectors in the circuit, or a malfunctioning transmission control module (TCM).

How can I diagnose the issue associated with the P2840 code?

To diagnose the issue, use an OBDII scanner to confirm the code, inspect the wiring and connectors for damage, and test the shift fork position sensor for proper operation.

What are some potential repair options for the P2840 code?

Repair options may include replacing the faulty shift fork position sensor, repairing damaged wiring, or reprogramming or replacing the TCM if necessary.

Is it safe to drive with the P2840 code?

It is not advisable to drive with the P2840 code, as it can lead to transmission failure or further damage to the vehicle if not addressed promptly.

Can I clear the P2840 code without fixing the problem?

You can clear the code, but it is likely to reappear if the underlying issue is not resolved, and driving the vehicle may cause further damage.

How much might it cost to repair the issue related to the P2840 code?

Repair costs can vary widely depending on the specific issue, but expect to pay anywhere from $100 for simple wiring repairs to over $1,000 for sensor or TCM replacement.

Are there any preventative measures to avoid the P2840 code?

Regular maintenance of the transmission system, including fluid changes and inspections, can help prevent issues that may lead to the P2840 code.