What to do when the right fault codes aren’t set
In this situation, we replaced the transmission in a 2004 Chevrolet Trailblazer and when the owner returned for a 15-day recheck, he mentioned that he had felt a hard shift at times. During my checks I found P0748 (Pressure Control Solenoid A Electrical) stored in the PCM history along with P0455 (Evaporative Emission Control System
