The P0780 code in your 2022 Audi Q5 indicates intermittent problems with pressure control solenoid B in the S tronic dual-clutch transmission. Intermittent faults present diagnostic challenges as they appear sporadically under specific conditions.
Q5 S tronic Pressure System
Audi's 7-speed S tronic uses pressure control solenoids to manage hydraulic clamping force on the dual clutches. An intermittent fault suggests solenoid B or its circuit fails only under certain temperature, vibration, or load conditions.
Causes of Intermittent P0780
- Loose electrical connection
- Temperature-sensitive component
- Marginally corroded connector
- Damaged wire insulation
- Early-stage solenoid failure
- Mechatronic intermittent fault
Symptoms May Vary
- Occasional pressure-related shift issues
- Sporadic check engine light
- Intermittent clutch engagement feel
- Problems tied to temperature
- Symptoms that clear themselves
- Random S tronic warnings
S tronic Maintenance Importance
Audi's S tronic requires specific fluid maintenance. Degraded fluid affects pressure solenoid operation and can contribute to intermittent faults. Follow Audi's maintenance schedule for S tronic service.