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Engine-Codes – Generic – P2840

P2840 Code - Shift Fork 'D' Position Circuit

Quick Answer

The P2840 diagnostic trouble code (DTC) refers to an issue with the Shift Fork 'D' Position Circuit in the vehicle's transmission system. Common causes include Faulty shift fork 'D' position sensor, Wiring or connector issues in the shift fork 'D' position circuit, Malfunctioning transmission control module (TCM) or engine control module (ECM). 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 indicates Shift Fork 'D' Position Circuit.
Common causes
Common causes include Faulty shift fork 'D' position sensor, Wiring or connector issues in the shift fork 'D' position circuit, Malfunctioning transmission control module (TCM) or engine control module (ECM).
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 15, 2024
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Code P2840 Description

The P2840 diagnostic trouble code (DTC) refers to an issue with the Shift Fork 'D' Position Circuit in the vehicle's transmission system. This code indicates that there is a malfunction in the circuit responsible for controlling the position of the shift fork 'D' within the transmission. The shift fork 'D' is a crucial component that helps to engage and disengage gears during the shifting process. When this circuit malfunctions, it can lead to various problems with the transmission's operation.

OBDII Code P2840 - Shift Fork 'D' Position Circuit
P2840 Code - Shift Fork 'D' Position Circuit

Common Causes of P2840

  1. Faulty shift fork 'D' position sensor
  2. Wiring or connector issues in the shift fork 'D' position circuit
  3. Malfunctioning transmission control module (TCM) or engine control module (ECM)
  4. Low transmission fluid levels
  5. Mechanical issues with the shift fork 'D' or related components

Symptoms of P2840

  1. Check engine light illuminated
  2. Rough or delayed gear shifts
  3. Slipping gears
  4. Inability to shift gears
  5. Stuck in a particular gear

How to Fix P2840

  1. Diagnose the issue using a scan tool to confirm the P2840 code and identify the specific cause of the problem.
  2. Inspect the shift fork 'D' position sensor, wiring, and connectors for any damage or corrosion. Repair or replace as necessary.
  3. Check the transmission fluid levels and top up if low. Perform a transmission fluid flush and filter replacement if needed.
  4. Test the TCM or ECM for proper functioning and reprogram or replace if faulty.
  5. Clear the DTC and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P2840

The typical repair costs for addressing the P2840 code can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, the cost of parts for replacing the shift fork 'D' position sensor or related components can range from $100 to $300. Labor costs at auto repair shops typically range from $80 to $150 per hour, with the total repair bill potentially amounting to several hundred dollars. It's advisable to check local rates and get multiple quotes from reputable repair shops to obtain a more accurate estimate based on your location and vehicle type.

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Code P2840 Information for Specific Makes

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.

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