P3435Cylinder 5 Deactivation/Intake Valve Control Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P3435 flags a short to ground on the control line of the cylinder 5 deactivation valve. GM documents it codewise twice: in the 2019 tables for the L84 V8, with under 0.5 ohm to ground in the driver-off state, 20 of 25 samples at 250 ms and Type B, and in an engineering bulletin for 3.6 L V6 engines (LGX, LGZ) where P3435 appears along with P3433 and P3409 when oil leaks from the rocker arm control valve. Oil that wicks into the connector can create exactly such a leakage path. P3433 is the open circuit, P3436 the short to power, P3434 a mechanical failure. In daily driving the engine simply stays on all cylinders.
- What you may notice
- Check engine lamp on
- Oil wetness at the valve cover around the control valve (V6)
- No fuel-saving cylinder deactivation
- Likely causes
- LikelyOil in the cylinder 5 valve connector creating a leakage path (GM 3.6 L V6)
- PossibleControl wire shorted to ground
- PossibleShorted cylinder 5 solenoid
- RareEngine control module 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.