Driver side low beam not working (not bulb)

Doodlebee · Feb 5, 2022

Hi,
My driver side headlight is out (everything is stock). Replaced bulbs on both sides. Driver is still out. Checked for error codes and got B2575. The turn signals and marker lights work on both sides. That code references automatic headlight relay control or body control module (BCM). From what I have read if it was a fuse issue the marker lights would be out. I did check fuse 33 which is under the hood. It was fine.

Anyone run into this? Truck is a 2020 zr2 with the diesel. Not finding much on this issue.

cheers
Doug

RJL1983 · Feb 5, 2022

Doodlebee said:
Hi,
My driver side headlight is out (everything is stock). Replaced bulbs on both sides. Driver is still out. Checked for error codes and got B2575. The turn signals and marker lights work on both sides. That code references automatic headlight relay control or body control module (BCM). From what I have read if it was a fuse issue the marker lights would be out. I did check fuse 33 which is under the hood. It was fine.

Anyone run into this? Truck is a 2020 zr2 with the diesel. Not finding much on this issue.

cheers
Doug

Prob the wire harness and bulb socket. Being a 2020 should be under warranty.

Doodlebee · Feb 5, 2022

Thanks for the response - when I replaced the bulb everything looked good even the socket. I put a bit electrical grease on the connection. Cleared the code but it comes back.

Calracefan · Feb 6, 2022

Check fuses , I had a Silverado that blew a fuse like that .

Doodlebee · Feb 6, 2022

Checked fuses and harness. Looks like a trip to the dealer. Strange one.

RJL1983 · Feb 6, 2022

Hope it's under warranty, good luck man

madcratebuilder · Feb 6, 2022

I had a intermittent problem with the pass side LED headlight bulb. It was a poor connection in the harness. I used some conductive bulb grease and it's been OK for 3 years now.

Elsalvador76 · Feb 3, 2023

I know this is an old post, but what was the name of the conductive bulb grease you used? I have a poor connection to my low beams, and I have to position them a certain way for them to work.

Jackrose · Feb 6, 2022

Doodlebee said:
Hi,
My driver side headlight is out (everything is stock). Replaced bulbs on both sides. Driver is still out. Checked for error codes and got B2575. The turn signals and marker lights work on both sides. That code references automatic headlight relay control or body control module (BCM). From what I have read if it was a fuse issue the marker lights would be out. I did check fuse 33 which is under the hood. It was fine.

Anyone run into this? Truck is a 2020 zr2 with the diesel. Not finding much on this issue.

cheers
Doug

Friend of mine had this. A squirrel-mouse-chipmunk ate the wire. That wasn’t covered under the warranty.

00Z85 · Feb 6, 2022

Check the main connector into the headlight housing. I've seen them on other Chevy models that use the same headlight housing connector get corroded and cause the pin to heat up and get damaged.

Snipesy · Feb 10, 2022

Yeah. I just cut them and put in DT connectors. That’s a $200 fix vs like $2000 it takes to replace that main harness.

Doodlebee · Feb 10, 2022

Thanks everyone for the help. I headed to the dealership tomorrow. I will post back what they find. See attached for error codes.

gherbert · Feb 26, 2022

B2699 CHEVROLET code possible causes

Faulty Right Low Beam Headlamp
Right Low Beam Headlamp harness is open or shorted
Right Low Beam Headlamp circuit poor electrical connection
Faulty Body Control Module (BCM)

Doodlebee said:
Replaced bulbs on both sides. Driver is still out

Doodlebee said:
I got lucky on this one. Dealer verified the error codes. They put in a new factory bulb and cleared the codes

So the end result it was the bulb. Sometimes it is the simplist of solutions

Snipesy · Feb 10, 2022

Eitheir fried BCM or the connector broke.

Doodlebee · Feb 16, 2022

Thanks everyone - I got lucky on this one. Dealer verified the error codes. They put in a new factory bulb and cleared the codes. I think they reset the BCM and everything is working fine. I got out for under $100 bucks. The dealer did echo about checking the actual connections and reseating the bulb.

Thanks again.

pulverisor14 · Feb 26, 2022

Doodlebee said:
Hi,
My driver side headlight is out (everything is stock). Replaced bulbs on both sides. Driver is still out. Checked for error codes and got B2575. The turn signals and marker lights work on both sides. That code references automatic headlight relay control or body control module (BCM). From what I have read if it was a fuse issue the marker lights would be out. I did check fuse 33 which is under the hood. It was fine.

Anyone run into this? Truck is a 2020 zr2 with the diesel. Not finding much on this issue.

cheers
Doug

Colorados and canyons were designed poorly for the headlight wiring, (to save yourself a lot of wasted time pull the driver side kick panel. You will see 2 big bulk connectors, the bottom one is for the headlights. There are 2 large wires in that connector, red/yellow and a blue/black. They are probably corroded. Cut and splice the wires, changing the harness will be to involved, if the connectors look good use silicone to seal the terminals from water

Snipesy · Feb 26, 2022

To add to this, I think the primary problem is the space between the hood and engine bay is pretty poorly sealed. Water rushes right in along the edges. As does snow.

Doodlebee · Feb 26, 2022

Thanks again everyone with the responses.

cheers
Doug

gherbert · Feb 3, 2023

You can use any dielectric grease:
I use this in my connections to protect them:

CRC 3.3 oz. CRC Technician Grade Dielectric Grease Tube Box/Conduit/Fitting Accessory 05113 - The Home Depot

Driver side low beam not working (not bulb)

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