A P0748 code in your 2022 Hyundai Santa Fe indicates an electrical problem in the pressure control solenoid circuit. This code identifies circuit-level issues—shorts, opens, or resistance problems—rather than solenoid performance issues. Your Santa Fe's 8-speed automatic requires reliable electrical communication with the pressure control solenoid.
Electrical Circuit Issues
The pressure control solenoid circuit includes the solenoid coil, wiring from the TCM to the transmission connector, and the transmission's internal harness. P0748 triggers when the TCM detects abnormal electrical characteristics that prevent proper solenoid control.
Common Causes
A failed solenoid with an open or shorted coil is common. Damaged wiring in the transmission connector or harness. Corrosion at connector terminals affecting circuit integrity. Poor grounds affecting current flow. Internal transmission harness damage from fluid contamination or heat.
Symptoms in Your Santa Fe
Harsh or erratic shifts if pressure control is lost. Transmission may enter failsafe mode with fixed pressure. Delayed engagement when shifting into gear. Poor shift quality throughout the range. Check engine light with P0748 stored.
Hyundai Diagnostic Approach
Using Hyundai GDS, check for solenoid circuit errors. Test solenoid resistance at the transmission connector—compare to specifications. Check for voltage at the solenoid when commanded. Inspect connector terminals for damage or corrosion. Test circuit for shorts to ground and opens.