The P0752 code in your 2019 Ram 2500 indicates that shift solenoid A is stuck in the on position. This is the opposite of P0751—instead of being stuck off, the solenoid is continuously activated when it should be able to turn off. Your Ram 2500 may have either the 68RFE or Aisin transmission depending on configuration.
Shift Solenoid A Stuck On Effects
When shift solenoid A is stuck on, the hydraulic circuit it controls remains engaged continuously. This can cause the transmission to skip gears, start in the wrong gear, or have conflicts between gear applications. The specific effect depends on your transmission design.
Common Causes
A mechanically stuck solenoid that won't return to the off position. Valve stuck in the applied position due to debris or wear. Electrical short keeping the solenoid energized. Valve body issues trapping the solenoid valve. Spring failure inside the solenoid preventing return.
Symptoms in Your Ram 2500
The transmission may start in a gear other than first. Shifts may feel conflicted or the transmission may skip gears. Harsh engagement when shifting into Drive. Possible gear ratio errors as the TCM detects conflicting gear states. Check engine light with P0752 stored.
Heavy Duty Truck Diagnosis
Using Chrysler wiTECH, monitor transmission adaptive values and solenoid states. Check for gear ratio codes that might accompany P0752. Test solenoid valve movement—it should move freely when de-energized. Inspect the valve body for stuck valves. Note that Ram 2500s work hard and solenoid wear is not uncommon.