P0702 – Transmission Control System Electrical

Description

The ECM detects an electrical malfunction in the transmission control system.

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Symptoms

  • Harsh shifting
  • Limp mode
  • No shift

Causes

  • Wiring issues
  • TCM failure
  • Poor grounds

Diagnosis

  • Inspect wiring
  • Check TCM power
  • Scan for faults

Repair

  • Repair wiring
  • Replace TCM