AutoCodes – Dodge – P2642 Dodge

P2642 Dodge Code - Torque Management Feedback Signal 'B' Range/Performance

Quick Answer

To improve shift feel, the Transmission Control Module (TCM) may request that the Engine Control Module (ECM) reduce engine torque during shift events. Common causes include Faulty Engine Control Module (ECM), Faulty Transmission Control Module (TCM), Engine Control Module (ECM) software update. 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: P2642 Dodge indicates Torque Management Feedback Signal 'B' Range/Performance.
Common causes: Common causes include Faulty Engine Control Module (ECM), Faulty Transmission Control Module (TCM), Engine Control Module (ECM) software update.
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 2,994

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 Jan 23, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2642 Dodge Description

To improve shift feel, the Transmission Control Module (TCM) may request that the Engine Control Module (ECM) reduce engine torque during shift events. When such a request is received, the ECM responds by retarding the base ignition timing and notifying the TCM that the request has succeeded. If the ECM is unable to comply with the request, the ECM sends the TCM a message that the request has failed.
The torque reduction request is sent to the ECM through a communication network called the controller area network (CAN). Two circuits are used to communicate CAN data between the ECM and TCM.
A fault in the CAN will not cause the ECM to set the Diagnostic Trouble Codes (DTC). If a CAN fault occurs, other DTCs will set before this code.
The ECM set the OBDII code when the TCM receives a torque reduction failure message from the ECM.

OBDII Code P2642 Dodge - Torque Management Feedback Signal 'B' Range/Performance - AutoCodes.com — P2642 Dodge Code - Torque Management Feedback Signal 'B' Range/Performance

What does this mean?

What are the Possible Causes of the DTC P2642 Dodge?

Faulty Engine Control Module (ECM)
Faulty Transmission Control Module (TCM)
Engine Control Module (ECM) software update
Transmission Control Module (TCM) software update
Engine Control Module (ECM) harness is open or shorted
Engine Control Module (ECM) circuit poor electrical connection

How to Fix the DTC P2642 Dodge?

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 P2642 Dodge 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 Help with the Code?

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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 P2642 Dodge Code

What does the OBDII code P2642 mean on a Dodge vehicle?

P2642 indicates a Torque Management Feedback Signal "B" Range/Performance issue, meaning the engine control module (ECM) has detected an abnormal signal from the torque management system.

What are the common symptoms of the P2642 code?

Symptoms may include reduced engine performance, activation of the Check Engine Light, difficulty shifting gears, and possible limp mode activation.

What causes the P2642 code to appear?

Common causes include a faulty torque management feedback sensor, damaged wiring or connectors, a malfunctioning ECM, or issues with the throttle body or transmission.

Can I continue driving with a P2642 code?

Itâ€™s not recommended to drive for long with this code as it can lead to reduced performance and potential damage to the transmission or engine.

How is the P2642 code diagnosed?

A mechanic will use a scan tool to retrieve the code, inspect the torque management system components, check for wiring or sensor issues, and perform tests to verify the root cause.

What tools are needed to fix the P2642 code?

A diagnostic scan tool, a multimeter for electrical testing, and basic hand tools for removing and replacing components are typically required.

Is the P2642 code related to the transmission?

Yes, the P2642 code can affect transmission performance as it involves the torque management system, which helps coordinate engine and transmission operation.

Can a software update fix the P2642 code?

In some cases, a software update for the ECM or transmission control module (TCM) may resolve the issue if it's caused by a programming error.

How much does it cost to fix the P2642 code?

Repair costs vary depending on the root cause but can range from $100 for minor wiring repairs to $500 or more for sensor or module replacements.

Can I fix the P2642 code myself?

If you have automotive knowledge and the necessary tools, you may be able to repair simple issues like inspecting wiring or replacing a sensor. However, advanced diagnostics may require professional help.