P0796Pressure Control Solenoid C Performance/Stuck Off
- 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. P0796 means valve C is electrically fine but pressure stays too low. GM's 6-speed flags 400 rpm slip in steady fourth gear with an intrusive test (4-5-6 clutch), the 8-speed 400 rpm for 1.5 s three times (clutch 3), the 9-speed clutch 3 slip over 200 rpm for 3 s, the CVT a line pressure deviation – all after one trip. GM noted false settings on 2017 8-speeds; a 9-speed bulletin calls for clutch inspection and a new valve body. Slipping, missing upper gears and limp mode follow.
- What you may notice
- Slipping or missing upper gears
- Limp mode
- Check engine light
- Likely causes
- LikelyClutch, return spring or piston seal of the assigned clutch faulty
- LikelyValve body or pressure valve dirty or worn
- PossibleFluid level low, fluid worn, filter clogged
- PossibleSoftware false setting
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €300 – €5,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.