P3447Cylinder 6 Exhaust Valve Control Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P3447 is about a ground fault on the lead of a stand-alone exhaust actuator for cylinder 6. No manufacturer documents this code publicly. GM, the one maker publishing the full set of cylinder 6 circuit codes, switches both valves of the cylinder with one solenoid and reports a ground short as the intake-side P3443: impedance below 0.5 ohm toward ground while the driver is off, 20 of 25 samples, Type B. A comparable test would apply here, because CARB requires circuit monitoring for every emission-relevant output. NHTSA notes that GM inhibits deactivation as soon as a solenoid driver circuit fault is present, so the practical result is an engine running on all cylinders. P3445 (open) and P3448 (short to power) are the neighbouring exhaust codes.
- What you may notice
- Check engine lamp on
- Engine stays in full-cylinder mode
- Likely causes
- PossibleExhaust actuator wire of cylinder 6 chafed against the engine
- PossibleInternal short to ground in the exhaust actuator
- RareDamaged driver 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.