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November 23, 2025 Service bulletin

Some customers may see the A/T warning light on during (or immediately after) engine start-up with DTCs...

Mazda technical service bulletin 05-001-25a for 2023-2025 Mazda MAZDA3 and 2023-2025 Mazda CX-30.

Bulletin number
05-001-25a
Component
Power train
Summary
Some customers may see the A/T warning light on during (or immediately after) engine start-up with DTCs P073D:00-TCM / P1738:00-TCM stored. P073D:00-TCM: Turbine/input shaft speed sensor: Sensor output range malfunction P1738:00-TCM: Automatic transaxle internal malfunction This concern is caused by improper TCM logic. To eliminate this concern, the TCM control software has been modified to change the DTC detection logic, preventing DTC judgment during start-up.

Owners of these vehicles have filed 12 complaints in the transmission category.

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