P3404Cylinder 1 Deactivation/Intake Valve Control Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P3404 is the short-to-power counterpart within the cylinder 1 group. GM tests it while the low-side driver is switched on: if the output still shows less than 0.5 ohm to supply voltage, the current has no proper path through the solenoid, and 20 of 25 samples at 250 ms set a Type B fault. The test only runs with at least 11 V at the powertrain relay and about 425 rpm (L84; 400 rpm on the L86). Ford names P3404 for the single deactivating cylinder of its VDE engines. Typical culprits are a control wire touching a supply line or a solenoid with shorted windings. Compare P3403 (short to ground) and P3401 (open).
- What you may notice
- Check engine lamp on
- Cylinder deactivation disabled
- Possible further circuit codes on other solenoids if a shared supply is affected
- Likely causes
- LikelyControl wire shorted to a supply voltage in the harness
- PossibleShorted winding in the cylinder 1 deactivation solenoid
- RareDamaged output stage in the engine control module
- 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.