Lost and more than a little bit concerned...

[SonOfNun]

I was driving home from 4th of July celebrations this morning and got ABS + TC warning lights on the dash of my 04 LT. I have an OBD-II scanner module installed, cranked up the app, ran a scan for all available codes and got error codes for these two issues. Plus a laundry list of other problems that I hadn't seen before today. I have tools to use. At least enough to do minor to intermediate repairs myself. But, I'm a novice mechanic, at best. So I wouldn't know where even to begin with diagnosing these issues, on my own. I'd at least like a severity-level based on the data so I know what to tackle first. Are there any issues here that I'd absolutely need to take to a shop for proper repair? Any advice would be greatly appreciated. Thanking the group in advance, for any help.

P.S., Sorry if the images are hard to read I couldn't figure out how to make them clearer on the app. I can clarify the data if anyone needs it.

 

[SpareParts]

If it seems to be running and driving fine i would check/clean all the grounds. Clear all the codes and see what comes back.
Did you recently have a dead battery?

 

[Fless]

If it seems to be running and driving fine i would check/clean all the grounds. Clear all the codes and see what comes back.
Did you recently have a dead battery?

The first thing that comes to mind is a low battery, whether it was drained or has a bad cell. Like @SpareParts suggests, clear the codes and have the battery load tested.

 

[SonOfNun]

So this isn't a mechanical issue at all? Just a bad battery? I was going to add that I do have a couple peripheral devices installed in the cab. A front and back dash cam and a USB-C plug-in for my phone that I know pulls on the battery. The battery itself is fairly new not even 6 months old. Checked the terminals which were okay but I cleaned them any way. Ran the scan test again and got all the same codes.

 

[SpareParts]

Check all the grounds you can find, At the engine, on the frame, under the driver's door.
A bad/low battery will cause a bunch of codes at the same time but so will a bad ground, BCM bad connection or going bad.
All them things you have shown can't possibly go bad at the same time. You have an electrical issue.

 

[Fless]

The code pics are unreadable, so post up better pics of them, or just list them in a post. If using a phone for the app, perhaps a screen shot would be clearer.

 

[OR VietVet]

Welcome to your first post at the forum.

After you have cleared codes again and checked all related connections and grounds, especially the add ons, I would like to know the "ma" draw that is going on when Tahoe is shut down for the evening. With all that running in the background, it pays to know. The add on peripherals were added on before the 6 month old battery or after? What type of battery is it? Flooded or AGM?

When checking for draw amounts, I like to use my Power Probe DRAW tool. here is a link to that:

 

[nonickatall]

Are you sure you cleared all the codes? And when did they reappear? Immediately after clearing and rereading? Or did you drive for a while and then reread the codes?

If you read the codes immediately, not all of them could have reappeared; some only reappear after driving for a longer period.

To me, this strongly suggests electrical problems, although it's certainly possible you have a real issue, such as a defective wheel bearing, which could explain the speed sensor issue on the wheel...

 

[SonOfNun]

Sorry for taking so long! Here's a better post detailing all the error codes. I'm still getting these same codes, even after clearing the codes from the app. I didn't use the truck all day yesterday. And when I started it up this morning, I still have the exact same codes as listed here.

Here is a summary of the key vehicle error codes identified in the scan report for the 2004 Chevrolet Tahoe:

Powertrain​

1. P1637: Generator 'L' Terminal Control Circuit (History)

Anti-Lock Brake System (ABS)​

1. C0035: Left Front (LF) wheel speed sensor circuit malfunction (Current)

Security & Shared Address Module​

1. B2948: Security system sensor power circuit high (History/Current)
2. B2961: Key in ignition circuit malfunction (History)
3. B3031: Security system controller in learn mode (History/Current)

Airbag System​

1. B0077: Third Row Center Seatbelt Pretensioner Deployment Control (History/Current)
2. B0078: Third Row Right Seatbelt Pretensioner Deployment Control (History/Current)

Digital Radio Receiver​

1. U1000: Class 2 Data Link Malfunction (History/Current)

Rear Climate Control Panel​

1. B0429: Check report for description (History/Current)
2. B0434: Check report for description (History)

Tire Pressure Monitoring System​

1. C0750: LF low tire pressure sensor malfunction (Current)
2. C0755: Right Front Tire Pressure Sensor (Current)
3. C0760: LR low tire pressure sensor malfunction (Current)
4. C0765: Right Rear Tire Pressure Sensor (Current)

Additional Communication Codes​

1. U1301: Class 2 Data Link High (History)
2. U1000: Class 2 Data Link Malfunction (History/Current)

These codes indicate issues with the charging system, ABS, security system, airbags, tire pressure sensors, and vehicle communication networks. Addressing these codes can help improve vehicle safety and reliability.

 

[Fless]

If you have an aftermarket radio then ignore the U1000, as there is no communication with the new radio.

 

[TollKeeper]

The only thing that I see to be concerned about, and is a current code, is the LF wheel speed sensor which will the ABS and TCS codes.

The rest, I would clear out, and check and see if any reappear. The ABS and TCS codes will self clear on your dash once the speed sensor starts reporting correctly. They will maintain in your system in history form.