The P0749 code in your 2021 Kia Sorento indicates an intermittent problem with the pressure control solenoid. The solenoid works sometimes but fails or behaves erratically at other times. This inconsistent operation affects shift quality and transmission behavior unpredictably.
Intermittent Pressure Control Issues
An intermittent pressure control solenoid creates unpredictable transmission behavior. Some drives may feel normal while others have harsh shifts. The TCM recognizes the pattern of inconsistent solenoid response and stores P0749.
Common Causes
Loose electrical connections at the transmission connector or TCM. Wiring with damaged insulation that shorts or opens depending on position. A solenoid that's partially failing—works under some conditions but not others. Corroded terminals that make contact inconsistently. Thermal issues causing the solenoid to fail when hot or cold.
Symptoms in Your Sorento
Shift quality varies from drive to drive or even within a single trip. Sometimes shifts are smooth, other times harsh. The check engine light may come on and off. Symptoms may correlate with temperature, vibration, or specific driving conditions. Frustrating inconsistency characterizes this code.
Diagnostic Approach
Using Kia KDS, monitor pressure control solenoid operation over an extended drive. Note when problems occur and correlate with conditions. Wiggle test connections while monitoring circuit response. Inspect all terminals for proper tension and cleanliness. Check for heat-related issues by testing when cold and hot.