AutoCodes – Chrysler – P2643 Chrysler

P2643 Chrysler 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 Chrysler 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 1,233

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

What does this mean?

What are the Possible Causes of the DTC P2643 Chrysler?

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 Chrysler?

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 Chrysler 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 Chrysler Code

1. What are the common symptoms of OBDII code P2643 in a Chrysler vehicle?

- Common symptoms include rough idling, poor acceleration, reduced engine power, and the illumination of the Check Engine Light.

2. What does the OBDII code P2643 Chrysler indicate?

- The code P2643 indicates an issue with the Torque Management Feedback Signal 'B' being lower than expected.

3. What are the possible causes of OBDII code P2643 in a Chrysler vehicle?

- Possible causes include a faulty oil control valve, wiring issues, low oil pressure, or problems with the engine control module.

4. How can I diagnose the OBDII code P2643 in my Chrysler?

- To diagnose P2643, you can use a diagnostic scanner to read the code, perform a visual inspection of the wiring, check the oil control valve, and verify oil pressure.

5. Is it safe to drive with OBDII code P2643 present in a Chrysler?

- It is not recommended to drive with code P2643 present, as it can lead to engine performance issues and potential damage if left unresolved.

6. Can I repair OBDII code P2643 in my Chrysler myself?

- While some simple repairs like checking wiring connections can be done by DIY enthusiasts, complex repairs involving the oil control valve or engine control module may require professional assistance.

7. How much does it cost to fix OBDII code P2643 in a Chrysler?

- The cost of fixing code P2643 can vary depending on the exact cause of the issue, but it may range from $100 to $500 or more, including parts and labor.

8. Will resetting the Check Engine Light resolve OBDII code P2643 in a Chrysler?

- Resetting the Check Engine Light may temporarily turn off the light, but it will not fix the underlying issue causing code P2643.

9. What are some preventive maintenance tips to avoid OBDII code P2643 in a Chrysler?

- Regularly changing the engine oil and following the manufacturer's recommended maintenance schedule can help prevent issues that trigger code P2643.

10. Can OBDII code P2643 cause permanent damage to the engine in a Chrysler?

- Ignoring code P2643 for an extended period can potentially lead to engine damage, so it's essential to address the issue promptly to avoid costly repairs.