NHTSA Complaint #11448403 — 2018 CHEVROLET CRUZE

Engine performance dropped noticeably, tire pressure system alert lighted, and stability track turned off. Then within a short period of time, some 30 minutes, the engine warning light activity (steady). All of this happened shortly after the 3-year warranty expired although I was having some engine roughness a few days before three years. Made an appointment at the Chevy dealership and the issue was diagnosed to a misfire on cylinder #1. Apparently, the insulator around the center electrode of the spark plug separated and slipped down. After a bit of research and asking the dealer for Chevy TSB #PIP5657D, NHTSA TSB #10201263, I was startled to find this is a somewhat frequent-enough problem affecting a number of GM models using 1.4L engine as used in my Cruze. I had a forthright conversation with Chevy dealer that this was a warranty issue as my OnStar alerted me to an emissions system malfunction. I also called GM and ACDelco, the spark plug manufacturer, and they claimed nothing or no issues. This is a safety concern to me. Paid almost $400 to have four spark plugs replaced at 3-years and only 7,000 miles; ACDelco warrants the spark plugs for 7-years or 100,000 miles!. Unacceptable.