P3453Cylinder 7 Exhaust Valve Control Circuit/Open
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- 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.
- What you may notice
- Check engine lamp on
- Cylinder deactivation locked out
- Likely causes
- PossibleInterrupted wire to the cylinder 7 exhaust actuator
- PossibleBurnt-out actuator coil
- RareCorroded actuator connector
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €60 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.