2023 Jeep Grand Wagoneer: engine overheating

Filed Sep 16, 2026 · Electrical · CO

I had to call the fire department because my the auxiliary battery in my Jeep had overheated creating a sulfur-like smell in my garage and eventually into my home. The fire dept recorded the aux battery temp over 200 degrees and the main battery was almost 150 degrees after sitting idle in the garage for over 5 hours and had only drove twice that day for no more than 20 minutes each time. I purchased the vehicle in May of 2023, I believe in Oct of 2023 the dealership had to replace the aux battery, now Aug of 2026 the aux battery failed again overheating and causing the main battery to swell and fail. The dealership was horrible about diagnosing the issue with no real answer and telling me that there is a software update in the works however; I have a friend in the business (works for Stellantis) who tells me that the automaker IS AWARE of these failing aux batteries due to them not shutting off. This known issue puts families at risk of fire and explosion. I do not feel anyone is taking this seriously. The dealership forced me to buy two new batteries, gave no reason why, and basically sent me on my way. I would like to know that someone is going to call on the automaker for a fix so that both my family and others, will not have to worry about having a dangerous vehicle parked in their garage.

Filed Dec 15, 2025 · Electrical, Engine · TX

An overheating engine causes the truck to shut down completely, block the power steering engine, and become undrivable. Electrical and harness assembly problems The dealership inspected the truck and attempted to repair it, but the same issues have recurred and are nearly causing an accident while driving on a highway.

Filed Aug 6, 2025 · Engine · 17,500 miles · MD

The contact owns a 2023 Jeep Grand Wagoneer. The contact stated that while his wife was driving approximately 65 MPH on the highway, the vehicle lost motive power and shut off. The vehicle was later towed to the local dealer, who diagnosed that the thermostat had failed, causing the engine to overheat. The contact was informed that the valve inside the thermostat had bound, causing improper internal operation of the thermostat. The thermostat was replaced, and the vehicle was repaired. The contact was informed that per TSB: 09-006-25, the same style thermostat was installed to repair the vehicle. The manufacturer was notified of the failure. The failure mileage was 17,500.

Filed Feb 24, 2025 · Engine, Fuel system · 33,363 miles · CT

The contact owns a 2023 Jeep Grand Wagoneer. The contact stated that while driving at an undisclosed speed, the vehicle stalled, and the engine overheated with the check engine warning light illuminated. The vehicle was restarted; however, the failure recurred. The vehicle was taken to the dealer where it was diagnosed that the fuel sensor had failed and needed to be replaced. The vehicle was repaired; however, the failure recurred. The contact stated that while driving at an undisclosed speed, the vehicle lost motive power with the check engine warning light illuminated. The vehicle was restarted. The vehicle was taken to the dealer where it was diagnosed that the fuel sensor failed and needed to be replaced. The vehicle was not repaired. The manufacturer was made aware of the failure. The approximate failure mileage was 33,363.

Filed Sep 18, 2024 · Engine · TX

2023 Grand wagonner : Vehicle overheats while driving and completely stops in the middle of the road with no time to pull over safely. This is the second time it has happened in a year of owning it. Check engine light has been on since the first time it overheated and dealers say they don't know why.