The P0748 code in your 2023 Ram 2500 indicates an electrical fault in the pressure control solenoid A circuit within the 68RFE 6-speed automatic transmission. This heavy-duty transmission relies on precise pressure control for towing and hauling.
Ram 2500 68RFE Transmission
The 68RFE is designed for heavy-duty applications, with pressure control solenoids managing line pressure based on load and throttle demand. Electrical faults in the pressure control circuit affect the transmission's ability to handle heavy loads.
Common Electrical Fault Sources
- Open circuit in solenoid A wiring
- Short to ground in circuit
- Short to battery voltage
- Connector pin corrosion
- TCM output driver failure
- Internal transmission harness damage
Symptoms of P0748
- Check engine light on
- Harsh or erratic shifts
- Reduced towing capacity
- Transmission slip under load
- Possible limp mode
- Warning messages on dash
Heavy-Duty Considerations
The Ram 2500's duty cycle includes significant towing loads that stress the transmission. Electrical faults affecting pressure control are particularly concerning in heavy-duty applications where proper clutch engagement is critical.