2016 rpm bouncing v8 mode only

[ben17314]

I have a 2016 tahoe and it seems the engine rpm fluctuates about 2-500rpm at most any speed under light load but only in v8. Up long grades around 55 in 5th gear you can hear the load change in the exhaust note. We have had the truck about 3-4weeks and around 2,000 miles. Took to the dealer they trumped it up as v4 but in v4 truck performs as you would expect with no issues. Anyone else seeing this. Thanks for any input.

[The Zip]

This is a new one, especially in V8 mode. That's dumb the dealer referenced V4 when you told him the issue happens in V8; take it to another dealer for starters. I frequently drive up grades at 80 mph and no fluctuation in rpms. Is the rpms the only thing you noticed?

[Daryl LBZ]

My 2009 Silverado did this constantly. I had AFM turned off, and with the dual exhaust you could hear the RPM change. It almost sounded like it was going in and out of 4 cylinder mode, but it obviously wasn't because it was tuned out. I never did figure out why it did it.

[ben17314]

Sometimes it seems like the power comes and goes. Wife drives truck must of the time says power surging is happening less. Idk if the truck is still "learning"! But it has also bumped at load going up steep hills low rmp v8 light throttle 2nd-3rd gear as if piping out of gear almost seems like it could stall sometimes. Don't know much about torque management. Could this be it

[ben17314]

Also when I bought the truck it had a dead battery had to put a jump box on it. After that the raido button stoped working, would only work on steering wheel. Next day pulled - on battery for 10min all the electronics seem to be working since then.

[robvas]

torque converter lockup?

[The Zip]

Fluctuating rpms could be a signal of a faulty alternator. Since the alternator charges the battery, if it is faulty your battery will die again. Did the dealer run an electronics diagnostic?

[ben17314]

Battery has been fine since reboot. They said no error codes and I dont know what they really did if anything

[The Zip]

...I dont know what they really did if anything

Break out the invoice and see what they did, but if it is the alternator that battery recharge won't last long.

[ben17314]

Invoice States road test 15 miles normal shifting characteristics of six-speed transmission and active fuel system changing from v4 to v8 road test check for DTCs no DTCs normal operation.

[The Zip]

According to the dealer, transmission ok, AFM ok, and no trouble codes. I've had fluctuating rpms before on my 2nd gen Tahoe, ended up being the alternator once and clogged emissions components another time. A new vehicle would somewhat eliminate clogged emissions components, so pay attention to your alternator. Getting a new battery or jumping your battery again will end with the same result, but if the battery does die again tell the dealer to look at your alternator. Hope you get it figured out

[AK_GONZO]

My truck did this from the first day that I bought it so I talked to the service adviser and he said that the transmission is "Learning" my driving habits and could take up to 20k miles before it levels out? pfffft

I find it really annoying so it'll be taken care of via a BBP tune.......DONE.

[ben17314]

So you did or didn't get a tuner yet?

[AK_GONZO]

So you did or didn't get a tuner yet?

If you're asking me, I have the tuner now, I've done the data logging and waiting to receive the tune from BBP.

[ben17314]

If you're asking me, I have the tuner now, I've done the data logging and waiting to receive the tune from BBP.