P2821Pressure Control Solenoid J Stuck On
- 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
- P2821 is the mirror image of P2820: valve J keeps acting after the module has released it. GM bulletin PIP5557 (revisions up to C) concerns 2018 Cruze, Equinox, Malibu and Traverse with nine-speed automatics (RPO M3D, M3E, M3H, M3U, M3V) that stay in second gear and will not pass about 30 mph. When the regular diagnosis finds nothing, the 0.5 mm orifice 33 in the spacer plate is checked against a light and the plate is replaced together with the TCM update from 18-NA-121. In the 2023 Corvette dual-clutch box J is the park lock engaging valve: below 3 km/h the TCM drains the lock piston through J alone, and if the position sensor keeps reporting the lock as released, the valve counts as stuck on (Type B). Ford's TR9070 puts the same fault of its park lock valve here.
- What you may notice
- Stuck in second gear, no upshift
- Top speed limited to about 50 km/h
- Park lock does not engage as expected
- MIL on
- Likely causes
- LikelyBlocked orifice in the valve body spacer plate
- PossibleValve J or its spool stuck in the applied position
- PossibleTCM software requiring the update released with the repair
- RarePark lock piston or latching valve not draining (dual-clutch)
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €150 – €4,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.