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OBD II Fault Code

  • OBD II P2643

OBD-II Code Transmission may not shift properly is defined as a Torque Management Feedback Signal "B" Low

The Transmission Control Module and the engine computer (PCM) constantly talk to each other to ensure that they are working together to produce the desired power output. If the two modules fail to communicate with each other, code P2643 is set.

Transmission may not shift properly Symptoms

  • Transmission may not shift properly

Common Problems That Trigger the P2643 Code

  • Powertrain Control Module (PCM) failure
  • Transmission Control Module (TCM) failure
  • Wiring issue

Common Repairs Needed for the P2643 Code

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