Instrument cluster not working

Both could be correct but I am going to side with the dealer and the cluster being the issue since they inspected it. I imagine they went through the testing that is included below. I attached quite a bit of info but the last couple of pages is what you need specifically the last part of the last page.

The dashes mean then VIN in the cluster does not match the VIN in the BCM. There is a process that is laid out with the scan tool that you can verify that the cluster is the issue.

As for the BCM's involvement in this, the ECM tracks the mileage. It then sends the info to the BCM which sends the info to the cluster to display it.

Let's run through this info and let me know if you have questions. I included the process of programming the cluster but again, you need a scan tool. I would suggest asking the dealer if they did the testing on the last page and if so, then they are correct that the cluster is the issue.

Let me know if you have questions. Thanks

Hi,

Angle, yes the true odometer reading will be displayed in the new Instrument Cluster and It's better to buy a new or GMC reconditioned Instrument Cluster they will install it and program it plus you get the GM warranty. And there's a possibility the BCM could be at fault but If the odometer itself is working means the ECM and BCM is doing there job and the problem could be the Instrument Cluster panel. The GMC dealer has an handheld diagnostic scanner to communicate with the ECM, BCM and the Instrument Cluster. They would know what module is not communicating at least they should. I sure do hope this was helpful and let us know If you need more information.

Thank you
Joe Terwilliger

Yes. They should have detailed notes about what they found. They normally provide some of this info but not always. I would just call and ask to either speak with the tech and see if he went through the test that I provided or ask to read the notes that they made while they were figuring out what the issue was.

However, based on what I am hearing and the test info that I provided, I think the dealer was correct with what they recommended as the issue.

Most handheld scanners that you would buy for a reasonable cost would not perform what you need. This is a dealer tool and the aftermarket scan tools that give this level of detail are very expensive.

I attached the process to replace it and the process to program it. You do need a scan tool to do this and if you get a used one, it will more than likely cause a similar issue to what you have now with the dashes. The dashes indicate a VIN mismatch which means the VIN that is in the cluster does not match that in the ECM. Unfortunately I would say you need to purchase a new unit and then have it programmed.

Hi,
Angel, I just want to give you a heads up on installing and programming a new cluster yourself. Electrical parts are nonreturnable or guaranteed once they are installed and be very careful handling the new cluster for it is a printed circuit board and even a static charge from your hands can damage it. Read the installation procedure carefully every step is essential to a successful ending. Please let us know if you are having any difficulty. We will be happy to answer any questions or send you information to help with a successful repair.

Thank you
Joe T.

I attached the info on this code but this makes it more clear why there are dashes and why they are saying it needs to be replaced. Basically this code is telling you there is an internal failure and the control board is no longer programmed so it is a mismatch of info. That is why the dashes are there. That indicates the same thing.

Looks like I would agree with the shop that the cluster needs to be replaced and programmed.

Hello,

If your worried about odometer actual reading. Yes, because the readings are stored in the ECM and BCM memories and it will communicate with the new Instrument cluster and display the actual miles. The dealer is just programming the new Instrument cluster to be specific to your vehicle. You see the vehicle never lost the odometer reading.

Thanks
Joe T.

Yes, they do have to program the new Instrument Cluster to be specific your vehicles VIN.
With the calibration software it can only communicate with the on-board computers in your vehicle. This is so know one can just remove the one you have and use it in another vehicle.
With more miles on to increase the value of their vehicle. I hope you understand now why the instrument cluster has to be programmed. Let us know if you need more information.

Thank you
Joe T.

Hello,

Yes it is the same as cloning I just never hear it put that way but you are right they taking a new Instrument cluster matching it exactly to the one they removed. Please let us know if you need more information.

Thank you
Joe T.

Sorry about the delay. I'm attaching location and removal for the BCM and wiring diagrams below. The wiring diagrams are in cut in 1/2 for easier viewing. Let us know if you need more information.

Thanks
Joe T.

Code: B101E 48; Definition: Electronic Control Unit Software Security Code Not Programmed; So it sounds like the BCM is not working correctly. This is where the security is held.