What Does P2641 Mean?
The PCM has detected a fault in torque management feedback signal B circuit. This is a general fault code indicating the signal is present but may have irregularities in voltage, frequency, or communication protocol.
Common Causes
30%
Intermittent wiring connection or loose connector in torque feedback circuit B
25%
Faulty transmission control module (TCM) not providing proper torque feedback to PCM
20%
Engine control module communication network issue affecting torque data exchange
15%
Defective engine torque sensor or traction control module feedback circuit
10%
PCM software version incompatibility or corrupted calibration data
Diagnostic Steps
1
Step 1: Check all connectors related to PCM, TCM, and ABS modules for proper seating, corrosion, and pin integrity
2
Step 2: Using a scan tool, verify communication between all control modules and check for additional network-related codes
3
Step 3: Monitor torque management feedback signal B voltage and data using bidirectional scan tool or oscilloscope
4
Step 4: Inspect CAN bus wiring for proper termination resistance (should measure approximately 60 ohms between CAN high and low)
5
Step 5: Check for available software updates for PCM and TCM; reflash if updates are available
Estimated Repair Cost
$150 - $1,500
Parts + labor, varies by vehicle and location
The PCM has detected a fault in torque management feedback signal B circuit. This is a general fault code indicating the signal is present but may have irregularities in voltage, frequency, or communication protocol.
The most common cause of P2641 (Torque Management Feedback Signal "B") is: Intermittent wiring connection or loose connector in torque feedback circuit B
Typical repair costs for P2641 range from $150 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
May affect coordination between engine, transmission, and traction control systems. Vehicle may exhibit harsh shifts or reduced stability control functionality.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2641 to identify the root cause.
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Quick Info
Category
Powertrain
System
Torque Management / Powertrain Communication Network
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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