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
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
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.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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