P3450 code meaning
Cylinder 7 Deactivation/Intake Valve Control Performance
Powertrain system Generic code P34xx codes Check engine light
What P3450 means
P3450 reports that cylinder 7 does not deactivate or reactivate as commanded while its solenoid circuit checks out. FCA lists it as Cylinder 7 Deactivation Control Performance for the 6.4 l Heavy Duty Hemi with MDS (RAM 2500 to 5500, bulletins 18-082-16 and 18-036-20): the MIL lights and a PCM reflash cures it, with an optional calibration that also eases drone and shudder in MDS mode. On the 2025 F-150 5.0 l, Ford bulletin 26-2093, which replaces 25-2487, pairs it with P3442 and has the left-bank solenoid oil feed tube replaced under the valve cover. In GM's system, as NHTSA describes it, oil pressure moves locking pins so the lifter body travels without opening the valve. GM's L84 uses P349E. Electrical faults: P3449, P3451, P3452.
P3450 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyHard
- Typical labor0.5 to 12 hours
- Clears after repairAfter a drive cycle
Symptoms of P3450
- Check engine lamp on
- Ticking noise from the valve train
- Misfire on cylinder 7 (P0307)
- Reduced-cylinder mode switched off
Common causes of P3450
- PossibleRestricted oil feed tube to the left-bank solenoids (Ford 5.0 l, TSB 26-2093)
- PossibleOutdated PCM calibration (FCA 6.4 l, bulletins 18-082-16 and 18-036-20)
- PossibleLocking pins in a cylinder 7 lifter sticking from wear or dirt
- PossibleInsufficient or aged oil delaying the switch
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Cylinder deactivation solenoidLifterEngine oil
What each part of P3450 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 3 | Mixed range: generic and manufacturer-specific codes. |
| 4 | Area: auxiliary emission controls (catalytic converter, EGR, EVAP). |
| 50 | The exact fault in that area. |
What to do next
- Note P3450 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P3450
What does P3450 mean?
P3450 means "Cylinder 7 Deactivation/Intake Valve Control Performance". P3450 reports that cylinder 7 does not deactivate or reactivate as commanded while its solenoid circuit checks out. It is a generic code, so it means the same on every make.
Is it safe to drive with P3450?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P3450 fail an emissions test?
Yes, it can. P3450 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P3450 to fix?
Difficulty: hard. A typical repair takes 0.5 to 12 hours of work. This is a job for a workshop.
Will P3450 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.