P1707 – Shift Solenoid A (Toyota)

Description

The ECM detected improper operation of shift solenoid A affecting hydraulic pressure and gear shifting.

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Symptoms

Harsh shifting
Delayed shifting
Slipping
Failsafe mode
Check engine light

Causes

Faulty shift solenoid A
Dirty ATF
Valve body blockage
Wiring issues
TCM driver fault

Diagnosis

Check ATF condition
Test solenoid resistance
Inspect wiring
Scan TCM data
Inspect valve body

Repair

Replace solenoid A
Refill ATF
Clean valve body
Repair wiring