Intermittent high beams

[WPSOSteve]

I run the motor pool for a sheriff's dept. We have 20+ 2015-'20 Tahoe PPVs. Currently I have two of them that have intermittent high beams. The highs do not come on when in low beam mode but they are inconsistent when the high beams are on. The low beams always work correctly. Totally random times and temperatures. Sometimes they work for long periods and other times they will flash back and forth. These are OEM headlights with OEM or equivalent bulbs. Our units do not have the Intellibeam system. I've tried to supply as much info as possible. Has anyone else run into this problem or have any suggestions?
Thank you, Steve

 

[Joseph Garcia]

What are the model years of the 2 trucks with the high beam issues?

 

[WPSOSteve]

Both are 2020.

 

[k_arnold72]

Is the automatic setting present and enabled for the high beams? Where it will turn back to low beams if it senses an incoming vehicle?

 

[WPSOSteve]

Is the automatic setting present and enabled for the high beams? Where it will turn back to low beams if it senses an incoming vehicle?

It does not have Intellibeam.

 

[PG01]

I think your light upfitter guy needs a call…

 

[WPSOSteve]

That's what I was afraid of. Just because they tend to take a month to do any job we bring them, large or small.

 

[StinkyLinky8]

I run the motor pool for a sheriff's dept. We have 20+ 2015-'20 Tahoe PPVs. Currently I have two of them that have intermittent high beams. The highs do not come on when in low beam mode but they are inconsistent when the high beams are on. The low beams always work correctly. Totally random times and temperatures. Sometimes they work for long periods and other times they will flash back and forth. These are OEM headlights with OEM or equivalent bulbs. Our units do not have the Intellibeam system. I've tried to supply as much info as possible. Has anyone else run into this problem or have any suggestions?
Thank you, Steve

I know you say you don’t have the intellebeam system or whatever it’s called but with mine I can enable the auto highbeam feature by pushing the highbeam/turn signal bar forward and hold for a second then release. However I’ve noticed when I use the auto highbeam feature occasionally on back roads, if I turn on the fog lights it disables my auto high beams completely and will only let me run low beams until I either manual turn off the auto highbeam feature by toggling in for a second or turning off my fog lights. I have an ‘18 Denali ultimate package. Hope this helps.

 

[PG01]

I know you say you don’t have the intellebeam system or whatever it’s called but with mine I can enable the auto highbeam feature by pushing the highbeam/turn signal bar forward and hold for a second then release. However I’ve noticed when I use the auto highbeam feature occasionally on back roads, if I turn on the fog lights it disables my auto high beams completely and will only let me run low beams until I either manual turn off the auto highbeam feature by toggling in for a second or turning off my fog lights. I have an ‘18 Denali ultimate package. Hope this helps.

PPV’s (the police version of these trucks) are different from the civilian models. They are programmed differently.

What you are experiencing when your fog lights are on is completely normal for these trucks. There are kits and some wiring options that keep all the lights on when high beams come on.

 

[k_arnold72]

Don't ppv's start as civilian models then go to an uptfitter? The might have just forgotten to disable that feature on this truck? But who knows

 

[PG01]

Don't ppv's start as civilian models then go to an uptfitter? The might have just forgotten to disable that feature on this truck? But who knows

Not really, they come out of the factory programmed differently, diff suspension etc. upfitters are normally just for lights, sirens k9 stuff

 

[JoeBlobs]

Here is the upfitter guide for the 2020 PPVs:

https://www.gmupfitter.com/wp-content/uploads/2021/05/2020-Tahoe-PPV-4WD-7.pdf

On page 31 it shows the location of the headlight flasher under the hood, as well as wiring info.
Maybe a bad aftermarket module or bad connection/ground? I would check connections under the hood and in the console for anything obvious.

 

[k_arnold72]

Gotcha. Yeah I thought they were just the base LS or LT models, then they get accessorized.

Not really, they come out of the factory programmed differently, diff suspension etc. upfitters are normally just for lights, sirens k9 stuff

 

[WPSOSteve]

Here is the upfitter guide for the 2020 PPVs:

https://www.gmupfitter.com/wp-content/uploads/2021/05/2020-Tahoe-PPV-4WD-7.pdf

On page 31 it shows the location of the headlight flasher under the hood, as well as wiring info.
Maybe a bad aftermarket module or bad connection/ground? I would check connections under the hood and in the console for anything obvious.

Thanks. I'll check into that.