![]() ![]() The real problem is the OBD II programming in the PCM. What works fine in a brand new car many not work so great after 50,000 or 100,000 miles or real world driving.Ĭhanging the fuel enrichment curve, spark timing or some emission control function slightly may be necessary to eliminate a hesitation, spark knock or other condition that develops over time.įor example, on certain GM vehicles the Check Engine light comes on and sets a code P1406 that indicates a a fault in the position of the exhaust gas re-circulation (EGR) valve.Ĭleaning or replacing the EGR valve and clearing the code does not fix the vehicle because the code usually returns. This philosophy of "build it now and fix it later" creates a lot of unnecessary recalls, but at least it gives technicians a way to fix factory mistakes without having to replace any parts.Ī reflash may also be required if the factory settings for the OBD II self-diagnostics turns out to be overly sensitive - especially after a few years of operation.The same goes for drive-ability. Fortunately, it isn't that bad yet with automotive PCMs, but it has become a crutch for automakers who rush products to market that aren't quite ready. It's a never ending cycle of upgrades and patches. ![]() Every time Windows OS or a new phone for example, comes to market, it they always turns out to have bugs and security holes that were somehow missed but must be fixed by downloading and installing the latest patch. ![]()
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