P0779Pressure Control Solenoid B Intermittent
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- Pressure control solenoids are current-controlled proportional valves, and what B and C mean depends on the design: on GM's clutch-to-clutch automatics they are the pressure valves of clutches 2 and 3, on GM's CVT B is primary pulley pressure and C line pressure, on Jatco CVTs B is the secondary pressure valve, on Saab's AF40 B and C are clutch valves SLC1/SLC2. In J2012 P0779 is an intermittent fault of valve B. The only manufacturer use found differs: Mitsubishi's 2022 Jatco CVT sets P0779 for an open circuit or short to positive in the secondary pressure valve circuit after 1 s (short to ground is P0778). The transmission then engages harshly, accelerates weakly and does not lock up.
- What you may notice
- Harsh engagement at times
- Weak acceleration, no lock-up
- Check engine light
- Likely causes
- LikelyConnector or wire open or loose contact
- PossibleShort to positive in the harness
- PossibleValve coil faulty
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €100 – €2,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.