2017 Duramax L5P base idle

[extrication]

Same with my 2017 after the emission update. It also has a vibration that can be felt in the steering wheel and floor board at idle. I’m hoping it’s going through a learning function, but you’re way past the time required for that.


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[Bbutch7179]

On 4/22/2020 at 8:19 PM, jaws3 said:

After the recent recall for Emission System upgrade to comply with gov standards (done 2 weeks ago) the base idle speed has increased to over 800rpm. Used to be just above 500rpm. Dealer says the higher base idle speed is "with limits". I don't agree. Talked to 2 drivers of similar trucks today and both said there base idle speed is just above 500rpm. These are company trucks so they don't know if recall upgrade was performed on the trucks they are driving. The exact scenario is that when I start the engine, idle is normal at just over 500rpm. It stays normal when shifting into DRIVE. Then start driving and at the very first stop 700m from my house, it base idle is over 800rpm. It stays like that until I shut down the engine and it is back to 500rpm when I start the engine again after work. But only until the first stop when it stays above 800rpm. This has been going on for the past 2 weeks (during which I also did a 1200km highway trip). I cannot find a reference to base idle speed on this engine. Is 800rpm considered normal? If it is my "new normal" I'll be selling the truck as it is driving my crazy with the added noise sounding like a jet engine at startup.