P0737 – TCM Engine Speed Output Circuit

Description

The ECM detects a malfunction in the TCM engine speed output circuit.

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Symptoms

  • Harsh shifting
  • Limp mode
  • No upshift

Causes

  • TCM failure
  • Wiring issues
  • Poor grounds

Diagnosis

  • Monitor TCM output
  • Inspect wiring
  • Check grounds

Repair

  • Repair wiring
  • Replace TCM