P0798Pressure Control Solenoid C Electrical
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- 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. P0798 is the electrical code for valve C. Only Saab's 9-5 (2010–11) with Aisin AF40 uses it: a deviation between commanded and feedback current of clutch valve SLC2 (normal range 0.1–1.1 A), with the circuit codes P0969–P0971 alongside, rated after two trips. The module switches all solenoids off and keeps only second gear and reverse, without adaption. GM and Ford use the circuit codes P0968–P0971 instead.
- What you may notice
- Limp mode (second gear and reverse only)
- Harsh shifts
- Transmission warning or check engine light
- Likely causes
- LikelyClutch valve SLC2 coil faulty
- PossibleWire or connector open or shorted
- RareTransmission module damaged (e.g. after a short)
- 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: €150 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.