Random P219A (Fuel Trim Cylinder Balance Bank 1)

[opfor2]

So every now and then I get a random p219a code. It will set and then a day or two later it will clear and then show up again a week or so later. I looked at all of the suspects per (https://charm.li/Chevrolet/2011/Sub...)/Testing and Inspection/P Code Charts/P219A/) and all seems well. I'm at a loss as to what else to try any ideas would be helpful.

Dan..

 

[rdezs]

You've probably got a vacuum leak. Make sure the dipstick is pushed all the way down, there's an o-ring that seals. Same for the oil filler cap. Check your PCV hoses to the intake. I find that a spray can of brake cleaner works great in finding where there's a vacuum leak, such as the intake manifold and gasket. Just be careful, it's flammable. Some people use WD-40, a little safer.

 

[rdezs]

.... It should be on the driver side of the engine though, if that helps. (The letter A signifies Bank 1 which is the driver side) As there's no code for the passenger side, I would suspect the intake manifold gasket or an injector o-ring on the driver side.

 

[Fless]

Compare the short- and long-term fuel trims for both banks, cold and warmed up. That's a lot of numbers but could be telling.

 

[petethepug]

After going through that supplied link for the DTC and reading it, I’m kinda spooked about purchasing a counterfeit part that’d send me on a wild goose chase.

 

[rdezs]

The disturbing thing is that what was OEM eight years ago, may not be the same OEM they sell you today. For some items, production has been moved to other countries, including China. Even though it's still an AC Delco part.... You have to wonder if it's really identical to the original in every aspect. Look at the country of origin on the below AC Delco package... I assume this item is being made in one of those countries, or maybe two or three or all of them... And it's not a generic package with that hologram. I'll bet 10 years ago they had one supplier for AC Delco, probably in Canada or Mexico. So yeah, unnerving to think about.

 

[rdezs]

So technically it's not counterfeit. But... They are presenting something that is not OEM from 2014.