Torque Management Feedback Signal B Range/Performance
The P2641 code means the vehicle's onboard diagnostic system has detected: Torque Management Feedback Signal B Range/Performance. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $100 - $800 (parts and labor)
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Common Symptoms
- Secondary torque signal out of range
- Stability control intervention issues
- Cruise control inconsistency
- Check engine light on
Probable Causes (Ranked by Likelihood)
- ECM B torque calculation error Very High
- Sensor input used for B signal inaccurate High
- Communication delay on CAN bus Moderate
- TCM B signal input circuit issue Low
Frequently Asked Questions
What is torque signal B vs signal A?
Some vehicles use redundant torque signals (A and B) for safety. Signal B provides a cross-check to verify signal A accuracy.
Can CAN bus delays cause P2641?
Yes. If the B signal is delayed due to CAN bus congestion or wiring issues, it may not match the A signal, triggering a range/performance code.
Is P2641 urgent?
Not immediately dangerous, but stability and traction control systems may not function optimally. Repair at your earliest convenience.
Mechanics Guide Step-by-step diagnosis
Step-by-Step Diagnostic Procedure
-
Compare torque signal A and B for consistency
-
Check all sensors involved in torque calculation
-
Monitor CAN bus for communication delays
-
Verify TCM B input circuit
Sources 2
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
- Cross-checked against the SAE J2012:2002 DTC table (2026-08-27)archived scan of the SAE standard — readable copy, not SAE’s current edition
Commonly Affected Vehicles
- 2010-2020 Ford F-150
- 2011-2020 Chevrolet Silverado
- 2012-2019 Ram 1500
- 2010-2018 Toyota Tundra
Related Codes
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