One problem related to automatic transmission control module has been reported for the 2004 Mazda MAZDA3. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Mazda MAZDA3 based on all problems reported for the 2004 MAZDA3.
2004 Mazda 3 automatic transmission failures. 1st offense, it required a pcm valve/solenoid replaced. , 2nd offense: transmission lost 4th gear and wont shift into 4th gear. Car is in a shop for diagnosis. Only goes up to 35 mph if shift manually and in 3rd gear, otherwise it revs, jerks, stalls, etc .