Powertrain, shared range

P3453 Cylinder 7 Exhaust Valve Control Circuit/Open

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P3453 is the code SAE assigns to an open circuit in a dedicated exhaust valve actuator for cylinder 7. No manufacturer documents this code publicly. GM's description of Dynamic Fuel Management, published by NHTSA, shows how exhaust control works without such an actuator: the same oil signal unlocks the intake lifter at once, while the exhaust lifter waits until the valve spring load drops on the base circle of the cam. Separate wiring exists only in designs with an extra exhaust actuator, and CARB would require its continuity to be monitored. Actual cylinder 7 circuit faults on GM and Chrysler V8s show up as P3449 instead. P3454 to P3456 are the other exhaust codes; P3455 is the short to ground.

Likely causes

Interrupted wire to the cylinder 7 exhaust actuator
Burnt-out actuator coil
Corroded actuator connector

Symptoms

  • Check engine lamp on
  • Cylinder deactivation locked out

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

P3454P3455P3456P3449P3400

References: law.cornell.edu, static.nhtsa.gov, static.nhtsa.gov.