NHTSA Complaint #11673435 — 2018 JEEP WRANGLER

Vehicle: 2018 Jeep Wrangler Sport Unlimited VIN: [XXX] Mileage at failure: 40,631 miles Issue Date: [XXX] Component: Engine / Cooling System / Head Gasket My 2018 Jeep Wrangler began experiencing overheating issues at approximately 40,000 miles. The engine cooling fan was frequently running on high, and I noticed an increase in coolant loss. The vehicle was taken to an authorized dealership, where a hydrocarbon test was performed and failed — confirming a likely head gasket failure on the driver-side cylinder head. The technician suspected a defect in the cooling system. I was quoted $4,500 just for engine disassembly, before any repairs. The vehicle is now undrivable and is being sent to another independent shop for a second opinion, costing an additional $250. My Wrangler has been properly maintained, and there is no evidence of abuse or neglect. I have attached a dealership invoice and diagnostic notes. This kind of failure should not occur on a well-maintained vehicle with only 40,000 miles. After researching the issue, I discovered that other Jeep owners have reported similar overheating and head gasket failures, particularly in models equipped with the 3.6L Pentastar engine. Technical Service Bulletin (TSB) 18-078-18 Rev A describes cooling system concerns that may contribute to this type of failure. I believe this may indicate a broader defect in the engine or cooling system. Stellantis has not responded to my repeated requests for assistance. I am filing this report to document the issue and request a formal investigation, as this may be part of a wider pattern of early engine failure affecting this vehicle model. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)