P3409Cylinder 2 Deactivation/Intake Valve Control Circuit/Open
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P3409 is the open-circuit code for the deactivation control of cylinder 2. GM uses it on two very different engines. On the 3.6 L V6 (LGX, LGZ) cylinder 2 is one of the two active fuel management cylinders, and an engineering bulletin links P3409 to oil leaking from the rocker arm oil control valve in the camshaft cover. On the L84 V8 with Dynamic Fuel Management every cylinder has a solenoid; GM flags an open circuit when it sees more than 200 kohm with the driver off, 20 of 25 samples at 250 ms, Type B. Shorts are P3411 and P3412, a mechanical failure P3410. The driver sees a warning lamp and loses the fuel-saving mode.
- What you may notice
- Check engine lamp on
- Oil residue around the valve cover control valve (V6)
- No reduced-cylinder operation, higher fuel use
- Likely causes
- LikelyOil leaking at the control valve and soaking its connector (GM 3.6 L V6)
- PossibleBroken wire or loose pin in the cylinder 2 solenoid circuit
- PossibleOpen coil in the cylinder 2 deactivation solenoid
- RareEngine control module output driver fault
- 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.