OBD-II code · Powertrain (manufacturer / generic)
P3401 Cylinder 1 Deactivation/Intake Valve Control Circuit Open
The engine control module has detected an open circuit at the cylinder 1 deactivation or intake valve control solenoid. Without a valid circuit, cylinder 1 cannot be deactivated.
Is it safe to drive with P3401?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelySolenoid coil open
- PossibleWiring or connector open
- Less likelyPin pushed back out of connector body
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–6 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Cylinder Deactivation Solenoid, Engine Wiring Harness, Ecm
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.