P1700 – Transmission Control System Malfunction (Toyota)

Description

The ECM detected a malfunction in the transmission control system affecting shift quality and drivability.

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Symptoms

Harsh shifting
Delayed shifting
Failsafe mode
Poor acceleration
Check engine light

Causes

Faulty TCM
Wiring issues
Low ATF level
Valve body malfunction
Sensor faults

Diagnosis

Check ATF level
Inspect wiring
Scan TCM data
Test sensors
Inspect valve body

Repair

Refill ATF
Repair wiring
Replace sensors
Service valve body
Replace TCM if needed