P1758 – Line Pressure Solenoid Electrical (Toyota)

Description

The ECM detected an electrical malfunction in the line pressure solenoid circuit.

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Symptoms

Harsh shifting
Delayed shifting
Slipping
Failsafe mode
Check engine light

Causes

Open or shorted wiring
Faulty solenoid
Connector corrosion
TCM driver fault

Diagnosis

Test solenoid resistance
Inspect wiring
Check connectors
Scan TCM data

Repair

Replace solenoid
Repair wiring
Clean connectors
Replace TCM if needed