P25a2 and u3009-00

[Pavlo Mykhaylenko]

Hello got those codes i know what they mean but cant find where to looks for this ground cable any advice.also it has check engine on nothing else.and the most interesting part that it came and go away  day after day.Abs module that has 2 black color on bottom and 2 reds  had about 12.7 v

Edited July 23, 2023 by Pavlo Mykhaylenko

[Jsdirt]

Would be super helpful if you could post the code meanings. We don't know what they mean. We're all not walking encyclopedias of auto repair.  There's just TOO MUCH to memorize these days. Most things have to be looked up.

 

So codes coming and going indicate an intermittent. Those are lots of fun to diagnose. Just ask any tech. You'll have to get a good scan tool on there and do a wiggle test of the harness & connectors, while watching for a drop out or glitch in live data. Even better, watching a scope for the drop out to try and pinpoint which wire, or pin in a connector, is frigged up.

Edited July 24, 2023 by Jsdirt

[Pavlo Mykhaylenko]

P25a2 its brake system controle module Mill illumination and

U3009-00 brake control module ground 2 circuit 

So as far as testing i try to check conector from abs module 2 on top and 2 on bottom witch is 2 groungs and 2 positives wires all has 12.7v cant find  diagram for that connector  if any one have access  to Mitchell  it would  be so helpful 

[silveradosid]

what vehicle is it

[Pavlo Mykhaylenko]

2021 silverado 1500

[silveradosid]

maybe this https://gmauthority.com/blog/2021/03/gm-to-fix-eboost-brake-unit-in-some-2021-chevy-silverado-1500-gmc-sierra-1500-models/

[Jsdirt]

 

On 7/30/2023 at 10:05 AM, Pavlo Mykhaylenko said:

2021 silverado 1500

Should still be under warranty if you're under 36k miles. Let GM fix their crap engineering.

[Pavlo Mykhaylenko]

I wish it will be under warranty. In my case  car get in accident  and lost all warranty so now its need to be either sold with whis problem  or keep it and fixing it