P3449 code meaning
Cylinder 7 Deactivation/Intake Valve Control Circuit/Open
Powertrain system Generic code P34xx codes Check engine light
What P3449 means
P3449 tells you the engine computer lost continuity in the circuit to the cylinder 7 deactivation solenoid. Chrysler documents it twice for the 5.7 L Hemi with MDS: a 2025 bulletin for the 2023 RAM 1500 eTorque lists it next to a cylinder 7 misfire (P0307) and fixes it with new PCM software, and a STAR case names P3449 first when the driver-side manifold heat shield has worn through the MDS harness at the rear of the cylinder head. GM uses the code on AFM V8s (L86, LT4 Corvette) and on the DFM L84, flagging more than 200 kohm in the off state, 20 of 25 samples, Type B. P3451 and P3452 report shorts, P3450 a mechanical fault on cylinder 7.
P3449 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P3449
- Check engine lamp on
- Engine stays in eight-cylinder mode
- Rough idle or misfire on cylinder 7 (P0307) on the 5.7 L Hemi
Common causes of P3449
- Most likelyMDS harness at the rear of the driver-side head worn through by the manifold heat shield (5.7 L Hemi)
- PossibleCylinder 7 solenoid coil open
- PossibleSolenoid connector loose or corroded
- Less likelyPCM calibration needing an update (Chrysler TSB 18-002-25)
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Cylinder deactivation solenoidWiring harnessECM
What each part of P3449 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). |
| 49 | The exact fault in that area. |
What to do next
- Note P3449 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 P3449
What does P3449 mean?
P3449 means "Cylinder 7 Deactivation/Intake Valve Control Circuit/Open". P3449 tells you the engine computer lost continuity in the circuit to the cylinder 7 deactivation solenoid. It is a generic code, so it means the same on every make.
Is it safe to drive with P3449?
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 P3449 fail an emissions test?
Yes, it can. P3449 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 P3449 to fix?
Difficulty: medium. A typical repair takes 0.5 to 4 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P3449 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.