Chevy and GMC Duramax Diesel Forum - Reply to Topic
2017-19 GM T-K2 Platform Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

Thread: L5P RPM surge during decel Reply to Thread
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  Topic Review (Newest First)
01-18-2020 03:58 PM
757ian123 My truck does the same thing. Doesn't hurt anything so who cares?
01-13-2020 09:28 PM
chevyrod On my 2nd l5p it surges too they say it’s normal. But also say that loose idler arm is normal with 14k on it 🤷♂️🤷♂️
01-11-2020 05:35 PM
Rickibobby My 2019 has done this since new as well. I havent spoken to the dealer about yet though.
01-11-2020 04:10 PM
lil_schmitty I'll follow up with corporate next week. I haven't heard anything since filing the original complaint.
01-11-2020 03:39 PM
White94rx Be sure to update this thread if they do something that fixes it. I'm sure a simple software update could take care of it, but it may not even be on GM's radar if there's not a lot of people complaining about it.

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01-11-2020 09:55 AM
chevyzr1 Hi there, first time poster. I just purchased a 2019 L5p brand new off the lot last month. My truck does the exact same thing when I’m slowing dow to go to my mailbox on my way home from work everyday. I’ve already been going back and forth with my dealership about a rust issue on the frame so I’ve been waiting to get that dealt with before I bring this up. I will say a couple of times sitting at a stop light it has randomly surged but luckily when it’s happened my foot was on the brake pedal !
11-17-2019 06:41 PM
Craddock01 Thanks for the response. I will watch for this but does anyone else experience what I have described?
11-17-2019 05:57 PM
White94rx No, this is something else. It doesn't happen on a downshift. One way it does it every time is backing down my driveway. It's a little steep, and I back down fairly quickly. When I start slowing at the bottom, you can watch the tach bounce up and down by about a hundred rpm or so. And it will do it in first gear going forward too. Our boat is stored in a shed at the marina. It's up a steep hill. I give it almost no throttle to get rolling down the hill. It stays in first gear, but you can hear the engine surging a little and see it on the tach.

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11-17-2019 10:56 AM
Craddock01 I have an 18 Duramax L5P and every once in a while (maybe once every month or 2) when decelling probably between 5-10 mph, it will downshift into 1st and obviously surge or throw me forward in my seat. I can't give specifics because I cannot replicate and it happens randomly so I'm not looking at the gauges when it happens (I'm in traffic so I'm paying attention to the cars in front of me &#x1f928. Is this what you're referring to or something else? I've written it off as a glitch in the programming but it is frustrating and would be alarming if towing and on a downhill slope.
11-17-2019 07:49 AM
White94rx Mine has done it since new. I'm at 10k miles. Clearly they're not going to do anything about it. I figured so, which is why I haven't taken it in. It's annoying, but not hurting anything I don't think.

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