P2639 Ford Code - Torque Management Feedback Signal 'A' 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
- P2639 Ford indicates Torque Management Feedback Signal 'A' 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.
Code P2639 Ford Description
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.
What are the Possible Causes of the DTC P2639 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 P2639 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 P2639 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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Frequently Asked Questions about P2639 Ford Code
1. What are the common symptoms of OBDII code P2639 in a Ford vehicle?
- Common symptoms include reduced engine power, poor acceleration, illuminated Check Engine Light, and potential difficulty shifting gears.
2. What can cause the Torque Management Feedback Signal 'A' Low code (P2639) to trigger in a Ford vehicle?
- The code may be triggered by a malfunctioning torque management feedback sensor, a wiring issue, or a faulty powertrain control module (PCM).
3. How serious is OBDII code P2639 in a Ford vehicle?
- While the vehicle may still be operable with this code, it is important to address it promptly as it can affect engine performance and potentially lead to other issues if left unresolved.
4. Can I continue driving my Ford vehicle with OBDII code P2639 present?
- It is not recommended to continue driving with this code present, as it can impact the drivability of the vehicle and lead to further damage if not addressed.
5. How can I diagnose the cause of OBDII code P2639 in my Ford vehicle?
- Diagnosis typically involves using a scan tool to read the code, checking the torque management feedback sensor and related wiring, and testing the PCM for proper function.
6. Is it possible to reset OBDII code P2639 in a Ford vehicle without fixing the underlying issue?
- While you can clear the code temporarily, it will likely reappear if the root cause is not addressed. It is recommended to fix the underlying problem to prevent further issues.
7. Are there any DIY repair tips for resolving OBDII code P2639 in a Ford vehicle?
- DIY enthusiasts can check the wiring connections to the torque management feedback sensor, inspect the sensor for damage, and perform basic electrical tests before seeking professional help.
8. How much does it typically cost to repair OBDII code P2639 in a Ford vehicle?
- The cost of repairs can vary depending on the exact cause of the code, but it may involve replacing the torque management feedback sensor, repairing wiring issues, or reprogramming the PCM.
9. Can a mechanic easily fix OBDII code P2639 in a Ford vehicle?
- A qualified mechanic with experience in diagnosing and repairing Ford vehicles should be able to efficiently address the underlying cause of the code and restore proper functionality.
10. Will fixing OBDII code P2639 improve the overall performance and fuel efficiency of my Ford vehicle?
- Yes, resolving this code can help restore optimal engine performance, improve fuel efficiency, and prevent potential drivability issues in your Ford vehicle.
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