P2640 Chrysler Code - Torque Management Feedback Signal 'A' 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
- P2640 Chrysler indicates Torque Management Feedback Signal 'A' 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.
Code P2640 Chrysler 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 P2640 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 P2640 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 P2640 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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Frequently Asked Questions about P2640 Chrysler Code
1. What does the OBDII code P2640 mean on a Chrysler?
The P2640 code indicates that the torque management feedback signal 'A' is reading higher than expected, which could point to an issue with the sensor, wiring, or engine control module (ECM).
2. What are the common symptoms of the P2640 code?
Symptoms may include reduced engine performance, the Check Engine Light turning on, poor acceleration, and, in some cases, the vehicle entering limp mode.
3. What causes the P2640 code to appear on a Chrysler?
Common causes include a faulty torque management feedback sensor, damaged or corroded wiring or connectors, a malfunctioning ECM, or software issues.
4. Can I drive my Chrysler with the P2640 code?
While it may be possible to drive, continuing to do so can lead to reduced performance or further damage to the engine or transmission. It’s best to address the issue promptly.
5. How do I diagnose the P2640 code?
Diagnosis involves using a scan tool to confirm the code, inspecting the torque management feedback sensor and its wiring, and performing tests on the ECM if no other faults are found.
6. How do I fix the P2640 code on a Chrysler?
Repairs may include replacing the torque management feedback sensor, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the ECM if necessary.
7. How much does it cost to repair the P2640 code?
The repair cost varies depending on the cause. Sensor replacement can cost $100–$300, while ECM repair or replacement may cost $500–$1,500, including labor.
8. Can a software update fix the P2640 code?
In some cases, a software update for the ECM may resolve the issue if it is caused by a programming fault.
9. What tools are needed to troubleshoot the P2640 code?
You’ll need an OBDII scan tool, a multimeter to check electrical connections, and potentially manufacturer-specific diagnostic software for deeper analysis.
10. What happens if I ignore the P2640 code?
Ignoring this code can lead to further stress on the engine and transmission, reduced fuel efficiency, and potentially costly repairs down the line.
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