This bulletin applies to 2016-2019 Chevy Corvette models equipped with LT1 or LT4 engines. If the SES lamp is on and the engine experiences misfires, and DTC P0300, P0308 or any cylinder numbers in-between are set, inspect for a possible loose spark plug wire at the ignition coil.

If a loose spark plug wire is found, inspect for a missing C-clip on the wire end that connects to the ignition coil. Replace the offending spark plug wire.

Check plug wires before you waste time with further diagnostics.

Example of a good wire (left) and a bad wire where the C-clip has come off or is missing.

Example of a good wire (left) and a bad wire where the C-clip has come off or is missing.

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