What Does P2640 Mean?
The powertrain control module (PCM) has detected an abnormally high voltage signal from torque management feedback circuit A. This circuit monitors actual engine torque delivery to ensure it matches commanded values for traction control, stability control, and transmission integration.
Common Causes
35%
Wiring harness damage, chafing, or short to voltage in torque management signal circuit
25%
Faulty accelerator pedal position sensor sending incorrect torque request signals
20%
Defective throttle body or throttle actuator control module providing erroneous feedback
15%
PCM internal fault or software calibration issue affecting torque management logic
5%
Corroded or damaged PCM connector terminals causing high resistance or intermittent signals
Diagnostic Steps
1
Step 1: Inspect all wiring and connectors between the PCM, throttle body, and accelerator pedal sensor for damage, corrosion, or evidence of shorts to power
2
Step 2: Using a digital multimeter, measure voltage on the torque feedback signal circuit with key on engine off; compare to specifications (typically 0.5-4.5V range)
3
Step 3: Monitor live data for accelerator pedal position, throttle position, and torque management values while slowly pressing the accelerator pedal
4
Step 4: Perform wiggle test on all related harnesses and connectors while monitoring signal voltage to identify intermittent faults
5
Step 5: If all circuits and sensors test normally, check for PCM software updates and consider PCM replacement if fault persists
Estimated Repair Cost
$150 - $1,200
Parts + labor, varies by vehicle and location
The powertrain control module (PCM) has detected an abnormally high voltage signal from torque management feedback circuit A. This circuit monitors actual engine torque delivery to ensure it matches commanded values for traction control, stability control, and transmission integration.
The most common cause of P2640 (Torque Management Feedback Signal "A" High) is: Wiring harness damage, chafing, or short to voltage in torque management signal circuit
Typical repair costs for P2640 range from $150 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
May cause unexpected engine torque delivery, affecting vehicle stability and traction control operation. Drive cautiously and avoid aggressive acceleration until repaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2640 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Torque Management / Electronic Throttle Control
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
