Powertrain, shared range

P3405 Cylinder 1 Exhaust Valve Control Circuit/Open

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

J2012 reserves P3405 for an open control circuit of a separate exhaust valve actuator on cylinder 1. No manufacturer documents this code publicly. The common systems do not need it: in GM's Dynamic Fuel Management one solenoid per cylinder feeds oil to both intake and exhaust lifters, and Ford's VDE only lists intake codes for cylinder 1. A GM patent application uses one shared hydraulic valve and only sets the order, with the exhaust valves switched off and back on before the intake valves; a Ford patent watches the exhaust valve via exhaust pressure. A separate exhaust actuator would fall under CARB's output component rule, which asks for continuity checks. If used, an open coil or wire would set P3405, while P3401 covers the intake side and P3406-P3408 the other exhaust faults.

Likely causes

Broken wire or loose terminal to the exhaust valve actuator
Open coil in the cylinder 1 exhaust valve actuator
Output driver fault in the engine control module

Symptoms

  • Check engine lamp on
  • Cylinder deactivation or valve switching disabled

Repair estimate

DifficultyMediumDIY possible
Parts and labour€60–900
Time0.5–4 h

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

Parts involved

cylinder deactivation solenoidwiring harnessecm

Related codes

P3406P3407P3408P3401P3400

References: law.cornell.edu, static.nhtsa.gov, patents.google.com, patents.google.com.