Anyone having issues with 2021 Tahoe LT not starting? Cranking but no go

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1

Hey guys, could use some help.

I bought a 2021 Tahoe LT with 38k miles not too long ago. Everything was running smoothly, but now it won’t start at all. It cranks for a while but never actually turns over.

I checked a few things on this forum, and it seems like it might be the fuel pump control module. So I replaced it, but the problem is still there.

Could this be an issue with the ground wiring, or did my fuel pump just give up?

Any tips or ideas on what to check would be awesome.

2

You really need to check the error codes or troubleshoot properly. Otherwise, you’re just guessing.

You could end up replacing perfectly fine parts until you accidentally find the real issue.

3

Leith said:
You really need to check the error codes or troubleshoot properly. Otherwise, you’re just guessing.

You could end up replacing perfectly fine parts until you accidentally find the real issue.

I did check the codes. Here’s what I found:

P00FF
P0627
P0700
P12A6

Also, my powertrain fuse keeps blowing out.

4

@Macon
Here’s a link to the GM Technical Service Bulletin that matches your issue: GM TSB for your problem

5

Leith said:
@Macon
Here’s a link to the GM Technical Service Bulletin that matches your issue: GM TSB for your problem

Thanks! I’m checking that out right now.

6

Vey said:
Did you install the new part yourself? I’m pretty sure you need to get the fuel pump control module programmed by the dealership for it to work properly.

Yeah, I thought the same thing, but when I asked at the service shop, they told me it’s plug-and-play.