AutoCodes – Generic – P2641

P2641 Code - Torque Management Feedback Signal 'B'

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: P2641 indicates Torque Management Feedback Signal 'B'.
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 15,336

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 P2641 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 P2641 - Torque Management Feedback Signal 'B' - AutoCodes.com — P2641 Code - Torque Management Feedback Signal 'B'

What does this mean?

What are the Possible Causes of the DTC P2641?

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 P2641?

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 P2641 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.

Need more information about the P2641 code?

Need more information on how to fix the P2641 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P2641 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P2641 Chevrolet — Torque Management Feedback Signal 'B'
P2641 Chrysler — Torque Management Feedback Signal 'B'
P2641 Dodge — Torque Management Feedback Signal 'B'
P2641 Ford — Torque Management Feedback Signal 'B'
P2641 GMC — Torque Management Feedback Signal 'B'

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 P2641 Code

1. What are the common symptoms of OBDII code P2641?

- Common symptoms include rough idling, decreased engine performance, and illuminated Check Engine light.

2. What does OBDII code P2641 indicate?

- OBDII code P2641 indicates a problem with the Torque Management Feedback Signal 'B' in the engine control module.

3. What are the possible causes of OBDII code P2641?

- Possible causes include a faulty torque management feedback signal sensor, wiring issues, or a malfunctioning engine control module.

4. How can I diagnose the issue related to OBDII code P2641?

- Diagnose the issue by using an OBDII scanner to read the code, inspecting the wiring and connectors, and testing the torque management feedback sensor.

5. Can I still drive my vehicle with OBDII code P2641?

- It is not recommended to drive the vehicle with OBDII code P2641 as it can lead to further damage or engine performance issues.

6. How can I repair OBDII code P2641?

- Repair options include replacing the faulty torque management feedback sensor, repairing any damaged wiring, or reprogramming the engine control module.

7. Will resetting the Check Engine light resolve OBDII code P2641?

- Resetting the Check Engine light may temporarily clear the code, but the underlying issue causing OBDII code P2641 will still need to be addressed.

8. How much does it cost to fix OBDII code P2641?

- The cost of fixing OBDII code P2641 can vary depending on the root cause of the issue, but repairs may range from a few hundred to a few thousand dollars.

9. Can a DIY enthusiast fix OBDII code P2641?

- DIY enthusiasts with experience in automotive repair may be able to diagnose and fix OBDII code P2641, but it is recommended to consult a professional mechanic for complex issues.

10. How often does OBDII code P2641 occur in vehicles?

- OBDII code P2641 is relatively uncommon, but it can occur in vehicles with electronic throttle control systems that experience sensor or wiring issues.