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