A P0746 code in your 2023 Chevrolet Traverse indicates a performance issue with the pressure control solenoid. Unlike a complete malfunction, this code suggests the solenoid is functioning but not meeting performance specifications. Pressure regulation isn't meeting the TCM's expectations for current driving conditions.
Performance vs. Complete Failure
P0746 indicates the pressure control solenoid is responding but not correctly. Perhaps it's slow to respond, not reaching commanded pressure, or overshooting targets. The TCM recognizes the output doesn't match commands within acceptable tolerances.
Common Causes
A partially stuck or sluggish solenoid doesn't respond properly to commands. Contamination affecting solenoid movement speed or accuracy. Worn valve bore that allows pressure bypass. Electrical issues causing reduced solenoid response. Internal transmission wear affecting the relationship between solenoid command and actual pressure.
Symptoms in Your Traverse
Shift quality inconsistency—sometimes harsh, sometimes soft. Shifts that feel delayed or hunting behavior. Possible slippage during demanding conditions. Fuel economy variation as the transmission struggles to optimize. Check engine light with P0746 stored.
GM Diagnostic Approach
Using GM GDS2, monitor pressure control solenoid duty cycle versus actual line pressure. Check for correlation between commanded and actual values. Note response time when commands change. Test solenoid physically if accessible. Check transmission fluid condition—degraded fluid affects solenoid performance.