What is 0bd11 code 0742?

Answer 1

Depending on the car:

GM uses this one for TCC stuck on.

This could mean the torque converter hydraulic circuit applies pressure even though the computer does not command

OR

The Torque converter clutch will not release

OR

The solenoid that controls this is faulty.

This is likely to foreshadow a general transmission failure.

Have it checked by a knowledgeable person.