P1715 – Speed Sensor Malfunction (Toyota)

Description

The ECM detected a malfunction in the transmission speed sensor affecting shift timing.

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Symptoms

Harsh shifting
Delayed shifting
Incorrect speed reading
Failsafe mode
Check engine light

Causes

Faulty speed sensor
Damaged wiring
Connector corrosion
Sensor contamination
TCM signal fault

Diagnosis

Test speed sensor
Inspect wiring
Check connectors
Scan TCM data
Inspect sensor for debris

Repair

Replace speed sensor
Repair wiring
Clean connectors
Remove debris