2024 GMC Yukon
Mileage
13,333
Service Date
12/16/2025
Services Performed
- performed testing and there is trouble codes P0304 cylinder #4 miss fire, P0306 cylinder #6 miss fire and a code P0300 random cylinder miss fire. While inspecting noticed the engine bay is filled with leafs and also observed a rodent nest. Gained access to the cylinder heads and can see several wiring pig tails chewed in half. Will need to replace the 2 coil harnesses. On the test drive after repairing the harness with the scanner installed did notice very slight cylinder miss fires on cylinders 1,5 and 7. Possibly due to carbon build up in the intake valves. We cleaned the rodent nests out. The low windshield washer light is on. Installed 1 gal of washer solvent however the washer solvent light remained on. Found the wiring pig tail for the washer solvent level sensor also chewed up. Replaced harness
- splice in both coil pig tails and windshield washer level sensor pig tail
Ron M. gave our service a 5 star review on 1/2/2026
