2022 3.0 Duramax - Software Problems after TCM Update

[Redneck Limo]

Has anyone experienced issues with their truck after the TCM Update?  After updating mine, it immediately (before I left the dealership) threw a P1098.  The dealer then replaced the engine coolant control valve and cleared the code.  The next morning (after three or so starts), the engine throws another code (P2C7A), and the dealer now has the truck and is sending logs to Detroit for the technicians to review.  With an ETA of "we have no clue when you'll get your truck back." The service managers kinda implied that this is going to be a bit of a ******-show.

 

I realize the TCM isn't the ECM, but the timing of all the codes is one-for-one.  Asked them if they could roll it back and of course the answer was a hard no.

 

Love this motor/truck but it being in the shop for undetermined amounts of time while I have to drive a Buick Enclave isn't going to work for me.

[GMCustomerService]

12 hours ago, Redneck Limo said:

Has anyone experienced issues with their truck after the TCM Update?  After updating mine, it immediately (before I left the dealership) threw a P1098.  The dealer then replaced the engine coolant control valve and cleared the code.  The next morning (after three or so starts), the engine throws another code (P2C7A), and the dealer now has the truck and is sending logs to Detroit for the technicians to review.  With an ETA of "we have no clue when you'll get your truck back." The service managers kinda implied that this is going to be a bit of a ******-show.

 

I realize the TCM isn't the ECM, but the timing of all the codes is one-for-one.  Asked them if they could roll it back and of course the answer was a hard no.

 

Love this motor/truck but it being in the shop for undetermined amounts of time while I have to drive a Buick Enclave isn't going to work for me.

This sounds like an upsetting time, though we are glad to hear your GM dealership is involved and working with internal teams to diagnose and repair your truck. As Social Care advisors, we work alongside the customer and the dealership to act as an extra layer of assistance, and we would like to help. Please reach out to us at [email protected] along with your VIN and dealership information. By sending us a message, you consent to the information you provide being monitored and recorded by GM or those acting on GM’s behalf, subject to the GM Privacy Statement: https://www.gm.com/privacy-statement.

[redwngr]

On 6/4/2025 at 7:06 AM, Redneck Limo said:

Has anyone experienced issues with their truck after the TCM Update?  After updating mine, it immediately (before I left the dealership) threw a P1098.  The dealer then replaced the engine coolant control valve and cleared the code.  The next morning (after three or so starts), the engine throws another code (P2C7A), and the dealer now has the truck and is sending logs to Detroit for the technicians to review.  With an ETA of "we have no clue when you'll get your truck back." The service managers kinda implied that this is going to be a bit of a ******-show.

 

I realize the TCM isn't the ECM, but the timing of all the codes is one-for-one.  Asked them if they could roll it back and of course the answer was a hard no.

 

Love this motor/truck but it being in the shop for undetermined amounts of time while I have to drive a Buick Enclave isn't going to work for me.

 

Was it the TCM update that is supposed to add (more) diagnostics for the valve in the transmission?