scr warmup

[Mudflap77]

(08-24-2023 )onebadapple Wrote:  Hey Mudflap77 Had and now again having a similar problem. Search Rawze: “No lights no codes”. Had a cracked DOC under the heat shield. Fine for a year+. IT’S BACK! How did you fix it?

I just figured mine out a couple of days ago. Mine was the turbo intake temp sensor.
turbo intake temp should be roughly within 10% of the ambient temp. The ecm uses this sensor in part to calculate engine exhaust temp. My guess is if that sensor is reading high the ecm calculates the exhaust temp higher then it actually is and the ecm sees the DOC is reading lower then the calculated exhaust temp it figures its loosing a pile of heat and goes into scr warmup.