“2018 Express 4x4. #2 cylinder code at 98k. Head gasket. My friend had the same truck, 98k also and #2 cylinder code. (I forget # the code offhand). I replaced my motor for a low mile used for $7,500. He rebuilt his for $6,500 but still needed to replace the leaking oil pump housing on top of the motor? Both trucks are commuters. No heavy hauling or towing. Semi-synthetic every 5k. Otherwise great motor, plenty of power and very smooth running. He is starting a small claims suit locally.”
Had the same issue in my 2018 JGC Laredo but mine was the result of a leaking water pump at 77k miles. No warning lights about coolant temperature, coolant temp never got into the red, or low water level in the reservoir. Slight leak in cylinder # 2. Chrysler was going to replace the engine for free but the dealer wanted $5k to replace the engine.