I’m looking for some advice on a frustrating situation with my 2015 GX 460. I just had the fuel pump recall (19V005) and the Takata airbag recall (19V005) performed last Tuesday. The dealer I went to is supposedly the best in the region and has been awarded several times for their service, but I’m really questioning their quality control right now.

A few days after picking it up, the dash lit up with the Check Engine and TRAC OFF lights. I scanned it myself and found a mountain of codes that it seems they didn't even bother to clear before handing me the keys.

P0441 / P0455 (Gross EVAP Leak): I checked the gas cap and it's fine. When I monitored the live data, the computer is calling for a 55% purge, but the tank vapor pressure is stuck at atmospheric (404 inH2O). It makes me wonder if they even bothered to monitor the pressure after installing the new pump and Seal Kit (04009-81630) or if they just sent it.




B1866 (Knee Airbag Passenger Side): This is a "Current" code. Since they were literally working on the Inflator Kit (04007-1T260) under the dash, it's pretty clear they either left a connector loose or damaged the circuit. How a "top-tier" dealer sends a car out with a safety system code active is beyond me.

My first scan showed a bunch of other codes that were just left in the system that werent there.

It honestly feels like they just did the mechanical swap and didn't even bother to plug in a scanner to verify the work or clear the history. Has anyone else dealt with this kind of sloppy work from a "highly awarded" dealership? I’m heading back tomorrow to have them fix this mess, but I wanted to see if anyone else has run into this specifically after these recalls.

 

I have access to a mechanic's pit at my workplace, so I decided to back the truck over it and do a proper visual inspection before heading back to the dealer.

I followed the EVAP line all the way from the canister (which is mounted right above the spare tire) toward the gas tank. Right at the tank connection, I found it: a connector that is completely loose. It’s not just "not tight" I can literally move it freely with my hand. It was clearly never clicked back into place after they did the fuel pump recall.

The muffler is right there and it’s still scorching hot, so I’m waiting for everything to cool down so I can get my hand in there without getting burned. Once it's cool, I’m going to seat the connector properly, clear the codes, and check the live data again to see if the tank finally holds vacuum.

It is honestly ridiculous that a dealer sends a truck out with a major fuel vapor line just dangling off the tank. I’ll keep you guys posted if this clears the P0455.

 

So, I managed to get my hand in there once it cooled down and firmly seated that loose EVAP line. I heard a solid click, cleared the codes, and went for another test drive.

Unfortunately, the problem isn’t solved. Even with that line connected, the Vapor Pressure is still stuck high at 15.2 psi (420 inH2O), and interestingly, the Commanded Evaporative Purge is staying active even at idle. On a healthy GX, purge should be at 0% during idle to prevent a rough idle or stalling, so the ECU is clearly struggling to manage the pressure or is stuck in a continuous test loop because it can't find a vacuum.

This confirms there is another leak somewhere else. Since I’ve already found one disconnected hose, I have zero confidence in the rest of their work. I suspect the Fuel Pump Seal might have been pinched or improperly seated when they installed the new pump.

I’m heading back to the dealer tomorrow morning and demand that they drop the tank again to inspect every single connection and the pump seal.

Perform a full smoke test on the EVAP system to identify any other "forgotten" connections.

If they were careless enough to leave a main vapor line dangling, I can only imagine what the top of the tank looks like. I'll be showing them my diagnostic reports and the photos I took in the pit.

 

There won't be any tank vacuum unless the EVAP system is in test mode and the vent valve is closed.

Monitor the EVAP system just after a cold start while the EVAP system test is performed.

An EVAP system test can also be performed in the "Utility" section of the TechStream menu (smoke is unnecessary).

I have found vent lines disconnected after a recall, also knee airbag connectors that were not locked and fell off. Every shop has "Master Techs" with lots of "come backs".

 

Nevada , You are golden, mate! Your advice was spot on. After reading your message, I went back to the truck with my Kingbolen K7 and performed a full Evaporative System Check through the Engine/ECT utility menu.

The test took about 9 minutes to complete. I monitored the Vapor Pressure, and this time everything stayed within spec. Once the automated check finished with "No Trouble Codes", I went into the All Readiness menu.

The result for P0455 is now officially NORMAL.

It’s a bit frustrating that I had to do the quality control that a "top-tier" dealer missed, but I'm glad Ive is back to 100%. Thanks a lot for the help, owe u a beer