P1767 – Transmission Control Relay Stuck (Toyota)

Description

The ECM detected a stuck transmission control relay affecting TCM power supply.

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Symptoms

  • Failsafe mode
  • Harsh shifting
  • Delayed shifting
  • No communication
  • Check engine light

Causes

  • Stuck relay
  • Corroded contacts
  • Wiring issues
  • Connector failure

Diagnosis

  • Test relay movement
  • Inspect wiring
  • Check connectors
  • Measure voltage

Repair

  • Replace relay
  • Repair wiring
  • Clean connectors
  • Stabilize voltage

Related Problems

Related Fault Codes