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P2643 Powertrain

Torque Management Feedback Signal B Low

The torque feedback signal B reads below its valid range. Source sends a value below physical possibility or the bus signal is stuck low.

Affected components

  • Secondary torque user
  • Communication bus

Common causes

  • High likelihood: Source module sends invalid low value
  • Medium likelihood: Signal stuck low on the bus

Diagnostic notes

  • The malfunction indicator lamp may illuminate

Related codes

Sources

Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.

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