P341CDeactivation/Exhaust Valve Control Circuit Performance Bank 1
- 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
- P341C covers exhaust valves on bank 1 that ignore a deactivation command while their wiring and actuator coil check out. No manufacturer documents this code publicly. A Ford patent explains why it matters and how to spot it: a sealed cylinder whose exhaust valve keeps lifting leaves a trace in exhaust pressure, and the controller can respond by reactivating the cylinder, blocking further deactivation and storing a fault. Production engines control both valve sets per cylinder jointly, so GM, for instance, files such faults under its own per-cylinder codes from P3498. Electrically this circuit reports P340C; intake function on bank 1 is P341A, bank 2 exhaust P341D.
- What you may notice
- Check engine lamp on
- Popping or uneven exhaust note in reduced-cylinder mode
- Deactivation suspended
- Likely causes
- PossibleExhaust-side lifter or rocker on bank 1 not switching
- PossibleLow oil pressure or foaming oil
- RareBank 1 exhaust deactivation actuator sticking
- 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.