P2CDECold Start Cylinder 4 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
- On a four-cylinder engine cylinder 4 is the last one in the count; P2CDE reports that cylinder 4 did not follow the cold start valve command. Engines may do two different things during a cold start. A Delphi patent closes the intake and exhaust valves of selected cylinders after start-up and reopens them once the converter is hot enough to work, around 350 °C. A Ford patent on latched rockers instead sets the valve state at key-on according to whether it is a cold or a warm start, for example deactivating intake valves to cut the air spring while cranking. Either way the controller must see the commanded state reached. No manufacturer documents P2CDE publicly; its normal-operation counterpart is P3426. Drivers notice a harsh start or a shaky first minute.
- What you may notice
- Harsher cranking or start-up shake
- Rough first minute after a cold start
- Check engine lamp
- Likely causes
- LikelySwitchable rocker or lifter on cylinder 4 not changing state
- PossibleCylinder 4 solenoid drawing too little current due to corroded terminals
- PossibleAged or overdue engine oil impairing the hydraulic switching when cold
- RareImplausible coolant or oil temperature signal triggering the cold start strategy wrongly
- 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.