How can I tell if my GC needs a REGENERATION
You can look at the soot grams with your OBD reader if you can get the full data stream. That's what the PCM is using to run a regen, which it does about every 300 miles. Forced regen is when it shows on your cluster and says drive highway speed. I believe when the soot grams were above a threshold beyond a normal regen could mitigate.
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