AutoCodes – Ford – P2644 Ford

P2644 Ford Code - Torque Management Feedback Signal 'B' High

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: P2644 Ford indicates Torque Management Feedback Signal 'B' High.
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 1,321

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 P2644 Ford 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 P2644 Ford - Torque Management Feedback Signal 'B' High - AutoCodes.com — P2644 Ford Code - Torque Management Feedback Signal 'B' High

What does this mean?

What are the Possible Causes of the DTC P2644 Ford?

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 P2644 Ford?

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 P2644 Ford 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 P2644 Ford Code

1. What does the OBDII code P2644 mean for a Ford vehicle?

P2644 indicates that the Powertrain Control Module (PCM) has detected a high feedback signal from the torque management system, specifically related to circuit 'B.'

2. What are the common symptoms of the P2644 code in a Ford?

Symptoms may include reduced engine performance, poor acceleration, unexpected transmission behavior, or the Check Engine Light illuminating.

3. What causes the P2644 code to appear in a Ford?

Common causes include a faulty torque management feedback sensor, wiring issues, a malfunctioning PCM, or problems with the throttle body or related components.

4. Can a faulty PCM cause the P2644 code?

Yes, a malfunctioning PCM or corrupted software can cause the P2644 code by misinterpreting torque management feedback signals.

5. How do you diagnose the P2644 code on a Ford?

Start by checking for stored codes, inspecting the torque management feedback sensor and wiring, and testing the voltage and continuity of circuit 'B' using a multimeter.

6. What are the repair options for resolving the P2644 code?

Repairs may include replacing the torque management feedback sensor, repairing or replacing damaged wiring, updating PCM software, or replacing the PCM if necessary.

7. Is it safe to drive with the P2644 code on a Ford?

Driving with the P2644 code is not recommended, as it can lead to reduced performance, drivability issues, and potential damage to the transmission or engine.

8. How much does it cost to fix the P2644 code on a Ford?

Repair costs vary but typically range from $100 to $600, depending on whether you need to repair wiring, replace the sensor, or reprogram/replace the PCM.

9. Can a dirty throttle body trigger the P2644 code in a Ford?

Yes, a dirty or malfunctioning throttle body can interfere with torque management and potentially trigger the P2644 code.

10. Can clearing the P2644 code solve the problem permanently?

Clearing the code may temporarily remove the Check Engine Light, but it wonâ€™t fix the underlying issue. Proper diagnosis and repair are necessary to resolve the problem permanently.