P1768 – Transmission Control Relay Electrical (Toyota)

Description

The ECM detected an electrical malfunction in the transmission control relay circuit.

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Symptoms

Failsafe mode
Harsh shifting
Delayed shifting
No communication
Check engine light

Causes

Open or shorted wiring
Faulty relay
Connector corrosion
Voltage instability

Diagnosis

Test relay resistance
Inspect wiring
Check connectors
Measure voltage

Repair

Replace relay
Repair wiring
Clean connectors
Stabilize voltage