P2DEACylinder 1 Intake Valve Lift Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2DEA says the intake valves of cylinder 1 do not reach the lift the engine computer asks for, or get there too slowly. It is the first of a row of per-cylinder lift checks. CARB's rule for valve timing and lift systems demands that such systems be watched for missing the commanded position and for reacting too slowly, and explicitly lists one cylinder's lift pin failing to move as a case the failure analysis must cover. A GM patent shows how such a single-cylinder fault can be found without extra sensors: crank speed yields each cylinder's indicated mean effective pressure, and if its coefficient of variation does not shift by roughly 5 percent after a commanded lift change, that cylinder is flagged as stuck in high or low lift. No manufacturer documents P2DEA publicly. Expect rough running, a cylinder 1 misfire and the lamp.
- What you may notice
- Check engine light on
- Rough idle or shaking at low load
- Misfire code for cylinder 1 at the same time
- Likely causes
- LikelySwitching element or hydraulic link of cylinder 1 sticking (sludge, wear)
- PossibleLow oil level, wrong oil or restricted oil feed to the lift actuator
- PossibleCylinder 1 lift solenoid sluggish though electrically intact
- RareDamaged cam follower, valve spring or lifter on cylinder 1
- 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: €150 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.