DTC P1738; Automatic Transaxle Internal Malfunction: Notes

WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION:

Because the clutch in the automatic transaxle may be damaged, always replace the automatic transaxle even if a pending code (does not recur) has been detected.

DETECTION CONDITION & POSSIBLE CAUSE

DTC P1738:00	Automatic transaxle internal malfunction
DETECTION CONDITION	Malfunction location cannot be determined based on combination of gear ratio malfunction and oil pressure switch pattern malfunction.
FAIL-SAFE FUNCTION	Inhibits learning control. Inhibits manual mode. Inhibits neutral idle control. Inhibits AAS.
POSSIBLE CAUSE	ATF is less than specified value Automatic transaxle internal malfunction
SYSTEM WIRING DIAGRAM	Not applicable