Thread: P140B code
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Old 10-25-2018, 07:28 PM
DmaxMaverick's Avatar
DmaxMaverick DmaxMaverick is offline
Join Date: Apr 2001
Location: CA
Posts: 12,628

"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.
1985 Blazer 6.2
2001 GMC 2500HD D/A
2014 Chevy Cruze Diesel - Fabulous car, no problems at all, but sold Nov. 2016 @ 55K miles.
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