P3402Cylinder 1 Deactivation/Intake Valve Control Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- This code reports that cylinder 1 does not respond as expected when the engine computer switches it off or back on, although the control circuit itself tests fine. Ford lists P3402 in its Variable Displacement Engine monitor for 2020-2023 gasoline engines: it runs continuously during deactivation, entry and exit, between 400 and 4500 rpm and once oil pressure has had about two seconds to build. GM handles the mechanical check for cylinder 1 under its own code P3498 instead. Wiring faults on the same channel set P3401, P3403 or P3404. A driver typically notices a warning lamp, a shake when the engine changes modes, or a misfire on cylinder 1.
- What you may notice
- Check engine lamp on
- Shudder or jerk when the engine enters or leaves reduced-cylinder mode
- Misfire on cylinder 1 (P0301)
- Cylinder deactivation no longer used, higher fuel use
- Likely causes
- LikelyLow oil level, wrong viscosity or aged oil slows the hydraulic switching
- PossibleSwitchable lifter or rocker of cylinder 1 sticking or not latching
- PossibleDeactivation solenoid valve sticking or its oil screen blocked
- RareLeaking solenoid seal lets control pressure bleed off
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €3,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.