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VATS issue, 1991

Speedbird!

New member
Joined
Jul 23, 2025
Messages
1
Location
Texas
Corvette
1991 White (base)
History. Owned car two years with no resistor key (wires cut to key), starter relay by steering wheel removed. Car ran fine.
Then I get no crank and fuel injectors dead. Reinstalled starter relay with ground bypass (starter cranks car).
If I pump throttle vigorously car will run 1000-2000 RPM with backfires but barely then dies.
Module 1 CCM Code: C12 ...on board diagnostic no codes
Module 4 ECM Code: 46 ... VATS error
I attempted to install 30hz/50hz bypass at ECM (no effect at 4 different setting or multiple wire locations).
I reconnected resistor key to VATS (no change).
Where do I go from here?
 

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