Loose spark plug wire - here's the fix

[Retired Bob]

"Some 2014-2015 Silverado 1500, Suburban, Tahoe, Sierra 1500, Yukon, Corvette; 2015-2017 Escalade; 2016-2017 Camaro and CTS-V models equipped with a 4.3L, 5.3L or 6.2L engine (RPO L83, L86, LT1, LV3) may have an illuminated Check Engine lamp and DTCs P0300 – P0308 (Engine Misfire) may be set. DTCs P0301 – P0308 correspond to cylinders 1 – 8. If these conditions are found, inspect for a loose spark plug wire at the ignition coil.

 

On the loose spark plug wire, check for a “C” clip on the wire end (Fig. 29, #1) that connects to the ignition coil. Replace the spark plug wire if the “C” clip is missing (Fig. 29, #2) or damaged."

 

[TheHauler]

Awesome write up thank you!