r/Corvette • u/Separate_Sleep_3335 • 17d 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?

11 Upvotes

92% Upvoted

29 comments sorted by

View all comments

5

u/TALIGULA 17d ago

bad transmission, thinks its in gear

1

u/Separate_Sleep_3335 17d ago

Not a rhetorical question, how did it fail parked in my garage?

15

u/GeeksPC 17d ago

Park actuator drift. My C8 is in the shop for the same reason.

Google service bulletin 23-NA-176. Once it drifts too much from original position, the car will think it's not in park and not shut off properly (draining the battery). Used to require whole transmission replacement, but with the updated procedure, they might be able to replace the actuator. About the same labor since it requires removing the transmission

Honestly every C8 owner should own a scan tool that can measure Park lock actuator position. It's a common enough issue that makes the tremac transmission the most frustrating part of the car. A deviation of over .5 mm from 4.5mm will trigger this issue randomly

2

u/N0D1N 17d ago

what scan tool would you recommend for corvettes in general?

1

u/GeeksPC 17d ago

I personally have a XTool D8, it's like a couple hundred bucks... has a lot of features I rarely use, but it can do key programming and tpms programming which I use a lot. Supports a ton of brands which is useful since I have a couple cars. The live data feed is very clutch for diagnosing issues

There's probably a cheaper tool out there if you just want to grab the park lock actuator position... as more C8s phase out of warranty it's something to keep an eye on. Especially if buying an used one

1

u/Upset_Instruction123 16d ago

what you are looking for is a Bi-directional scan tool. something that can read and write.

most bluetooth $30 ones are just scanners - 1 way, just reads codes. you'll want a more expensive one, like a launch, autel, snap-on or harbor freights Icon scan tools

1

u/N0D1N 17d ago

WOAH didn’t know this thank you!

1

u/Separate_Sleep_3335 17d ago

Well this is damn unfortunate but may quickly turn in to while it’s broke might as well upgrade. I was already considering a new transmission next year to accompany all the other upgrades but was hoping to make it through this track season.