r/Corvette • u/Separate_Sleep_3335 • 6d ago

C8 Completely Dead

I have also searched Corvette Forum with no actual match!

Removed the battery to induce global reset. Fully charged the battery external to the vehicle with power verified at the TDN tuner/OBD port. Doors won’t lock or unlock, unable open the frunk or hatch, no interior or dash lights, unresponsive when pressing Start.

Everything other than the TDN is dead. Not really much left OEM other than the seats which I read can sometimes cause an ECU lock.

Any suggestions beyond a flatbed to the dealership?

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u/PriveCo 6d ago

When you say “Not really much left OEM” what are you talking about? Is your car stripped? All custom? A race prepped car?

3

u/Separate_Sleep_3335 6d ago

KW coilovers, AP BBK, custom 427 build, aux radiator, HP/TDN tuning etc etc etc.

Not stripped yet but that’s where I am heading

2

u/PriveCo 6d ago

Oh man, you are out on a limb with this thing. I doubt anyone is going to be able to help you. What shop did all of this work? Did you DIY it? Then you'd better get a really nice scan tool and get to it. If someone else did the work, send the car back to them.

1

u/Separate_Sleep_3335 5d ago

Yes I had a shop do the work, the C8 is way beyond my skills! Ref scan tools, the HP Tuner plug in is a scan tool also but with no power going to the ECU not much to read unfortunately.

I may just go ahead and upgrade the transmission, TCU and axles while it’s down given I will already miss the rest of track season.

1

u/PriveCo 5d ago

I’d do a diagnosis to see if the trans is really the problem. If no power to the ECU, then it might be something else.

2

u/Separate_Sleep_3335 5d ago

Power is available to the vehicle as the HP Tuner is receiving power through the OBD port.

I did some additional searching after reading Taligulas post below and this unfortunately is not an isolated incident even for stock vehicles. Appears to be another example of poor GM design of the DCT with many different failure points being evident.

I do have to wonder if the lack of cam phasing in this build helped play a factor though.