P140B code

[DieselDavy]

Chessy56,
I am surprised by the filth of the pre-filter foam. How many miles are on it?
(I hope you are going to report this incident to the GM folks)
dave

[chessy56]

That filter has ~ 37K on it. Yep, 37K miles (90% highway) and not even a year old. I believe the owner's manual has the change interval @ 45K miles. Even still, none of the dealerships in the area seem to have one of these in stock. I can't believe that after nearly a year since its release, some dealerships don't have routine replacement parts- like air and fuel filters! I may have better luck on-line somewhere.

And, when I raise the issue with Chevrolet (owner's site), I usually get the "refer your issue to the dealership" response. Come on Chevy- I know you've got people who monitor this site. How about a response!!!

[cabletech]

Rock Auto has the AC Delco filter for just under $22. Amazon lists the same filter for $30. I bought one from Rock Auto as a spare. Mine has been driven in 2 snows storms with no problems.

Jay

[chessy56]

I'm going to throw one more post on this topic as I've been getting these P-140B errors on and off for some time. I got another about a month or so back which made me look at the air filter- it was dirty and within a few thousand miles of its recommended change interval. New filter, cleared the error code and all was OK until driving in heavy rain at highway speeds weeks later- it came back again.

My dealership tech states that GM came out with a bulletin late September stating that they are looking into this issue but don't have a solution yet. GM is telling dealerships to clear the code, make sure the MAF sensor is clean, only OEM air filters are being used (no after market stuff) and send the customer on their way. I'll check with the dealership in a few weeks, but it appears GM is OK with ignoring the check engine lamp if it's only a P-140B.

[DmaxMaverick]

"Too much airflow at the EGR", coupled with intake air filter issues with rain/snow, suggests the filter restriction is causing the EGR to pass too much exhaust gas (air?) in to the intake. Earlier models had issues with too little EGR passage with some aftermarket intake systems/filters that had too little restriction. All of this may be "perceived", by the sensors, having been fooled by intake air restriction or redirection (which can fool the MAF). If the airflow numbers don't match up, it triggers a fault, real or not.

It is not uncommon for a dealer tech to suggest clearing a code and just driving it if the condition isn't harmful. If the engine runs and responds normally otherwise, it isn't likely to be harmful, at least in the short term.