keithpowers

I've got a 2012 G37x, and it is suffering from a persistent P0447 error code. The issue is, I've replaced the vapor canister (it's high mileage, and I thought it wouldn't hurt), and the purge valve/solenoid assembly but I'm at a loss as to what other part(s) can contribute to this code in the Infiniti ECU.

Any help would be appreciated.

ILM-NC G37S

iTrader: (3)

If you haven't already, download a copy of the factory service manual. This will have detailed instructions on diagnosing issues. You can go to this thread (courtesy of JSolo) and download from there as it appears the official source, NICOClub, has been abandoned.

From the FSM/ Section EC:
P0447: An improper voltage signal is sent to ECM through EVAP canister vent control valve.

POSSIBLE CAUSE
• Harness or connectors (The valve circuit is open or shorted.)
• EVAP canister vent control valve

Being that you already replaced the vent valve, the next step (which should have been checked first) is to make sure the harness/connectors are good. If you have a multimeter:

3.CHECK EVAP CANISTER VENT CONTROL VALVE POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.
2. Disconnect EVAP canister vent control valve harness connector.
3. Turn ignition switch ON.
4. Check the voltage between EVAP canister vent control valve harness connector (green wire) and ground.

This should get you started.

keithpowers

OK, thanks... That is what I will do.

keithpowers

Two of the wires (from the chassis harness) into the terminal were broken right at the connector.

I spliced in wires, properly soldered (and heat-shrink sleeved) and then wrapped it in loom, before sealing the loom with tape. I don't plan on trading the car in, so it's not an issue to me.

tripled

While you were getting this code was your car going into limp mode or driving funny or was it just a code that kept popping up ???

keithpowers

It was running rough and the fuel economy was tanking. Now it's back to what it was before the error popped up and stayed up.