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Q: P0748 on 1998 Cadillac Catera

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P0748 indicates that the control unit has detected and electrical problem (open or short) in the shift solenoid "A" circuit. This could be caused by a failed shift solenoid "A" or a problem in the wiring between the solenoid and the control unit.Can you tell me where is that in my car
Shift solenoid A is inside the transmission on the main control (or 'valve body"). Typically inside the transmission oil pan.

Circuit testing of that solenoid and its wiring is in order to find out what is going on.

Good luck,
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