Powertrain, generic (extended)

P2CDE Cold Start Cylinder 4 Deactivation/Intake Valve Control Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

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.

Likely causes

Switchable rocker or lifter on cylinder 4 not changing state
Cylinder 4 solenoid drawing too little current due to corroded terminals
Aged or overdue engine oil impairing the hydraulic switching when cold
Implausible coolant or oil temperature signal triggering the cold start strategy wrongly

Symptoms

  • Harsher cranking or start-up shake
  • Rough first minute after a cold start
  • Check engine lamp

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–3,000
Time0–10 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

cylinder deactivation solenoid cyl 4intake valve actuatorengine oil

Related codes

P2CDDP2CDFP3426P349BP0304

References: law.cornell.edu, patents.google.com, patents.google.com.