P2CDBCold Start Cylinder 1 Deactivation/Intake Valve Control Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2CDB is part of the monitoring of cold start emission strategies: some engines shut off cylinders or hold intake valves closed right after a cold start to heat the catalyst faster, and CARB requires the commanded elements of such a strategy to be checked while it is active. CARB also asks for faults found during the cold start strategy to carry codes distinct from the ordinary ones, which is why this code exists beside P3402. No manufacturer documents P2CDB publicly. Ford monitors P3402 continuously during deactivation, entry and exit from 400 rpm, once oil pressure has had about two seconds to build. A Ford patent chooses the valve state at start by engine temperature and detects latch pin motion from a dip in solenoid current. Expect higher cold start emissions and a cylinder 1 misfire.
- What you may notice
- Check engine lamp after a cold start
- Rough running in the first minutes after starting a cold engine
- Misfire code for cylinder 1 stored alongside
- Likely causes
- LikelyLatch pin of the switchable rocker or lifter on cylinder 1 sticking, often from contaminated oil
- PossibleWrong oil grade or low oil level slowing the switching while the oil is still cold
- PossibleCylinder 1 control solenoid responding sluggishly at low temperature
- RareEngine control software misjudging the cold start test, cured by an update
- 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: €100 – €3,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.