Possible Causes
WARNING: This page is about a different car, the 2002 Mazda 626 and 2001 Mazda 626. However, it is still accessible from the selected car via links, so may be relevant.
Following items are possible causes for DTC P0740:
- Low ATF level.
- Deteriorated ATF.
- TCC control solenoid or pressure control solenoid stuck.
- TCC slipping.
- Low line pressure.
- TCC shift valve stuck, converter relief valve stuck, pressure regulator valve, pressure modifier valve or solenoid reducing valve stuck.
- Oil pump malfunction.
- PCM malfunction.