General guidelines for tuning GM vehicles:

2) DTCs for EGR 1 3/8" Rubber Freeze Plug for Intake Manifold: P0400 P0401 P0402 P0404 P0405 P1406 P1409 . 3) DTCs for AIR: P0410 P0412 P0418 P1415 P1416 4) COT (Catalytic Over Temp): P0420 P0430. 6) GEAR CHANGES: 1) Corvette: **This only applies to automatic transmission equipped vehicles as the corvette reads the speed off the ring gear. ................
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