Hey guys, as the title states, I got those codes after getting the car out of winter storage. At some point in time, my ctek charger decided to stop maintaining the battery and it died. I put a new battery in and my radio and cluster are inop. Pulled those codes from the radio and HMI indicating a most bus break. I could communicate with every module but noticed the cluster was only reading .9V. Ive been professionally wrenching for 20 years so I know my way around a car, but regardless, I went back over the battery install, tried a hard reset, etc. My scanner was showing a break between node 4 and 1 which is the cluster and radio. I had a suspicion the cluster was at fault but I still checked HMI and the amp anyway just to be sure. I was going to check the radio but its a pita to pull out so I decided to tear the dash apart and pull the cluster. My powers and ground are solid so I jumped the most bus wires at the cluster connector and radio turned on! Im honestly stumped as to why the cluster went bad unless it happened when I tried the supply option on the charger to boost the voltage hoping it would be enough to bring the battery back up high enough to start charging it again but it quickly went to the red lit triangle. Im going to check pricing and availability from my local dealer on Monday since I'll be able to get a discount through the shop but I'm not opposed to buying from a vendor here if pricing is similar. Does anyone have a recommendation of who to contact from here for pricing?

PS- I'm well versed in the most bus rings so if anyone else is having a similar issue, dont hesitate to ask!

 

Which battery did you install? Did you break the little black wire?

 

Diehard AGM. Not my first choice but I get discounts through work. No its not broken, I removed it before I replaced the battery but I did double check it anyway. I read when they break, the charging system also acts up but mine is charging fine.

 

Note:
I have noticed in past posts that Cetek chargers have a lot of issues.

Thats why I use a Battery Tender, they're not perfect but better.

 

That is correct but you also have to confirm the module causing the issue has proper power and ground. Its not the wiring because I have everything I need going to the cluster, but not coming out of it. Jumping the most wires at the cluster completed the circuit and my radio turned on.

I already confirmed the cluster is at fault. If it was a wiring issue the radio would not have come back when I jumped the wires at the cluster.

Not be to rude but did you guys read the whole post? Im not asking for help diagnosing the issue. I gave a run down of my issue and briefly explained how I determined the cause, then asked if there's a vendor on here who sells factory parts that you all recommend.

 

Maybe I can get them to reimburse me the cost of a cluster 🤣 wishful thinking!

 

You know what they say about assumptions...could I have broken down the post better, yes absolutely but I rushed it. It doesn't take away from the fact your reading comprehension is trash. Did I ask what could cause the cluster to not get power? Do you understand questions are followed up with "?" I wasnt upset about anything but if you want to try to be a condescending *****, at least be a smart one with good reading comprehension skills. I saw no threads on the forum related to the issue I was having and rushed the post. My mistake for putting some info on the site that might help someone else one day while only asking if anyone here recommends a certain vendor who can get OE parts.

 

Not sure of what that means, but maybe the reason you are having problems is that you jumped the wrong wires. It is very easy to damage the micro controller modules. Even static will brick one. And I, like LT1 Z51 I thought the post was about the codes.

 

I didn't go through the diagnostic procedure until I had a problem. I am a master diag tech, there's not much that stumps me in terms of automotive repairs. The only wires I jumped were the MOST Bus wires at the cluster to confirm that was the only break in the ring, which it was. Chevy electronics are probably the worst in terms of failure rates. It probably happened when I hit the supply feature on the ctek to try to force feed voltage to a system that was stone cold dead. Regardless, I'm not concerned about the how, just the fix. Should hopefully have the cluster soon, dealer had to order it.

I can elaborate on the proper way to check for a faulty module if you want me to.

 

Oh my!

And we are once again "Off and running".

 

Installed the new cluster today and everything is back to normal 😉 Going to reflash tomorrow even though the BCM is obviously speaking to the IPC.