AutoCodes – Dodge – P2643 Dodge

P2643 Dodge Code - Torque Management Feedback Signal 'B' Low

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: P2643 Dodge indicates Torque Management Feedback Signal 'B' Low.
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 3,038

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 P2643 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 P2643 Dodge - Torque Management Feedback Signal 'B' Low - AutoCodes.com — P2643 Dodge Code - Torque Management Feedback Signal 'B' Low

What does this mean?

What are the Possible Causes of the DTC P2643 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 P2643 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 P2643 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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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 P2643 Dodge Code

1. What does the OBDII code P2643 mean on a Dodge vehicle?

P2643 indicates that the Torque Management Feedback Signal 'B' is low, suggesting an issue with the signal sent from the torque management system to the engine control module (ECM).

2. What are the common symptoms of code P2643 on a Dodge?

Symptoms may include reduced engine performance, hesitation during acceleration, poor fuel economy, and the check engine light turning on.

3. What causes code P2643 on a Dodge vehicle?

Common causes include a faulty torque management sensor, damaged wiring or connectors, issues with the ECM, or low voltage in the system.

4. Can a dirty sensor cause code P2643 on a Dodge?

Yes, dirt or debris on the torque management sensor can interfere with proper signal transmission and trigger this code.

5. How can I troubleshoot code P2643 on my Dodge?

Start by inspecting the wiring and connectors for damage or corrosion, check the torque management sensor for proper function, and test the ECM for faults.

6. Can I drive my Dodge with the P2643 code present?

While it may be possible to drive, it is not recommended as continued driving could lead to reduced engine performance or further damage to the vehicle.

7. How do I fix code P2643 on a Dodge?

Repair steps may include replacing the torque management sensor, repairing or replacing damaged wiring, or reprogramming or replacing the ECM.

8. How much does it cost to fix code P2643 on a Dodge?

Repair costs depend on the exact cause but typically range from $100 to $500, considering diagnostics, parts, and labor.

9. Can a failing ECM cause code P2643 on a Dodge?

Yes, a malfunctioning ECM can fail to properly process signals from the torque management system, triggering this code.

10. Is code P2643 specific to Dodge vehicles?

No, P2643 is a generic OBD-II code that can appear on various makes and models; however, the specific diagnosis and repair steps may differ for Dodge vehicles.