P0001 Code on my 2018 4R

[JAXJeremy]

Couple of months ago I installed the HUM ODB II diagnostics module on my 4R. It came with my new phone so I figured why not. In addition to diagnostics, it provides analytics on your driving.

Anyway, today while I'm sitting in my office and my 4R is out in the parking lot I get the following message..

Hi JEREMY,

Your 2018 TOYOTA 4RUNNER has triggered a Diagnostic Trouble Code (DTC) with the following details:

Code
P0001
Description
The Fuel Volume Regulator allows the fuel system to release excessive fuel from the engine back to the fuel tank. When the engine control module (PCM) determines that the Fuel Volume Regulator is not performing properly, the PCM will set code P0001.
This alert was detected at 03:47 PM on 07/17/2019.

What's weird is that I haven't driven it for over two hours, so the fact that it's throwing a code just sitting there is odd..

Planning to check it out with my regular scan tool when I get home, but I can't imagine a vehicle with 8K, especially a Toyota would have this kind of problem..Curious now whether it's going to pop a CEL when I start up..anyone with a newer 4R ever run across this?

 

[Holdout]

Found this post as I also got that message today from my Hum device on my 2011 Rav 4. I will also scan it tonight but I am guessing that it is a false code and problem with the Hum since you are getting it too.

 

[JAXJeremy]

Found this post as I also got that message today from my Hum device on my 2011 Rav 4. I will also scan it tonight but I am guessing that it is a false code and problem with the Hum since you are getting it too.

Interesting..I was thinking the same thing especially since the CEL never came on and I didn't notice any driveability issues. Didn't get around to checking with my code reader last night. Will try to do that today.

 

[meltdown]

I wonder is this has something to do with the fuel evaporation leakage check. I wouldn’t think that would trigger a code, but the timing brings it to mind. Curious to see what the knowledgeable members here come up with on this one.

 

[JAXJeremy]

I wonder is this has something to do with the fuel evaporation leakage check. I wouldn’t think that would trigger a code, but the timing brings it to mind. Curious to see what the knowledgeable members here come up with on this one.

good call out..you might be on to something. it had been about 2 or 3 hours since the last time I had driven it.

 

[JAXJeremy]

Found this on the interwebz..

this is part of the fuel evap leak check program ... after the vehicle sits for several hours the PCM does the LEAK test ... this does not do anything but check for a leak in the fuel vapor system....

this would explain the code triggering Hum since the vehicle wasn't running.