P3419 code meaning
Cylinder 3 Deactivation/Intake Valve Control Circuit Low
Powertrain system Generic code P34xx codes Check engine light
What P3419 means
P3419 says the line feeding the cylinder 3 deactivation solenoid is dragged toward ground. The L84 V8 in GM's 2019 OBD documents shows the test: while the low-side output rests, a resistance to chassis ground under half an ohm is wrong, and once 20 out of 25 readings, one every 250 ms, agree, with the powertrain relay above 11 V and the engine at 425 rpm or faster, a Type B fault is logged. The lamp therefore follows on the second trip, and some controllers add P3417 at the same moment. The older 2007 Displacement on Demand table still merged short and open for cylinder 3 into one solenoid test. P3420 is the opposite fault, P3427 the cylinder 4 equivalent. Driving stays normal apart from the lost fuel saving.
P3419 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 P3419
- Check engine lamp after two drives
- Engine no longer drops cylinders under light load
Common causes of P3419
- Most likelyInsulation of the cylinder 3 control wire worn through to ground
- PossibleInternal short of the cylinder 3 solenoid to its housing
- Less likelyOil or water bridging pins in the connector
- Less likelyDefective driver in the engine control module
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 P3419 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). |
| 19 | The exact fault in that area. |
What to do next
- Note P3419 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 P3419
What does P3419 mean?
P3419 means "Cylinder 3 Deactivation/Intake Valve Control Circuit Low". P3419 says the line feeding the cylinder 3 deactivation solenoid is dragged toward ground. It is a generic code, so it means the same on every make.
Is it safe to drive with P3419?
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 P3419 fail an emissions test?
Yes, it can. P3419 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 P3419 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 P3419 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.