Hey everyone. First post on this forum so please be kind. I'm new to diesels but not new to cars.

The patient: 2023 Suburban LM2 3.0 Duramax. 38,xxx miles.

Codes today: P25A2 Brake system control Module A requested MIL illumination
U0121 Lost communication with anti-lock brake system (ABS Control Module A)
P0562 System voltage Low
P0606 Control module processor
C0555 Left fron wheel speed sensor "A" incorrect component installed

The "check engine light" is illuminated.

When did it happen: I started normally in the morning and drove about 15 minutes (5 miles) and shut it down. Temps were in the mid 20's F. Vehicle sat 30 minutes.

Upon next startup dash lights illuminated, "service traction control, brake system, etc". Several error messages on dash and several warning lights. I'll try to post a photo.

Vehicle would go in to drive but parking brake would not disengage when pushed. I shut down and restarted a few times and all the warning lights went away except for the CEL. Parking brake still would not disengage but I put it in drive and was able to override the parking brake.

Possible diagnosis: I'm thinking that the cheapest/easiest thing to do is to replace the original battery. It is an AGM that is 3 years old now., The P0562 code leads me to believe that on startup the vehicle is not seeing enough amps.

About 1 month ago I took the batter out and charged it overnight using a Cetek charger. It did initially give an error and stopped charging but I was able to connect it again and it charged fully.

Alternatively I could take it to a dealer or shop and let them diagnose.

Previously I had gotten the C0555 code that illuminated the CEL but it went away after a few miles. This may be a genuine sensor issue as well as a low voltage problem.

But to me seems like low voltage is causing random faults. Any help is appreciated.

Dan

 

I've seen a few threads about the traction control light coming on in newer Chevys, and it usually seems related to bad wheel bearings or ABS sensors going haywire. Make sure you check those areas first, and if you're still stumped, it might be worth taking it to a dealer or a reputable mechanic to get it sorted out.

 

I agree it in all likelihood could be the wheel speed sensor, since I have gotten that error twice now (C0555).

I wanted to document these errors since, when I searched on this site, I didn't find anyone with those codes. The sensor is cheap but there is quite a bit of labor to get to it. Since I don't have my tools with me I'll have to pay someone to replace it if that turns out to be the culprit. It's sad that a sensor would fail after 37,xxx miles and right out of bumper-to-bumper warranty. Oh well.

I'm new to the area I live now and have yet to find a good independent shop because I haven't need one. I've taken the truck to the dealer for oil changes but I have not been impressed with the service department. I'll interview an independent shop Monday and see what they say. If they want to shoot the parts cannon at it then I will keep looking.

Thanks. I will post the resolution when I have one.

-Dan

 

I found this video showing the procedure to clean or replace the sensor. Anyone know if my 2023 Suburban has the same style of sensor?

Thanks

 

"just went through this on my 2022 Silverado, seems like the issue was a faulty sensor in the rear diff, dealer swapped it out and now everything's good to go, also had them reset the ESC system just to be sure."