2026 Jeep Grand Cherokee: check engine light

Filed Oct 28, 2026 · Electrical · 791 miles · NY

The contact owns a 2026 Jeep Grand Cherokee. The contact stated that the vehicle failed to start. The vehicle was jumpstarted and taken to the dealer, where the battery for the Auto START/STOP system was replaced; however, the failure recurred several days later. The vehicle was returned to the dealer, where a reconfiguration was completed as per the manufacturer’s instructions. The contact stated that both batteries were charged and tested, and the contact was informed that the batteries had passed the test; however, the voltage went from 12.5 volts to 11.7 volts in three days. The check engine warning light was illuminated, and the messages "Battery Needs Charging" and "Battery Low" were displayed. The vehicle was returned to the dealer a third time and remained for additional diagnostic tests. The manufacturer was notified of the failure by the dealer. The failure mileage was 791.

Filed Oct 4, 2026 · Acceleration, Brakes · TX

My 2026 Jeep Grand Cherokee has experienced repeated engine shutdown and braking-related failures while driving. The vehicle is currently at an authorized Jeep dealership and is available for inspection upon request. On May 17, 2026, while driving to Fair Oaks dealership due to an unusual engine noise, the check engine and brake warning lights came on. The engine then shut off while I was in the roadway, and I experienced loss of normal braking ability. I was frightened but managed to move the vehicle safely to the side of the road without a collision. The dealer inspected the vehicle, replaced the spark plugs, and returned it on May 29. I later received a recall notice involving the spark plug issue. I returned the vehicle to the dealer on September 11, 2026, and the recall/service work was completed. On September 23, 2026, while driving to work, a similar dangerous failure occurred again. The check engine light came on, the engine shut off while the vehicle was moving, and I again experienced a braking problem. I was terrified but fortunately managed to stop safely. The vehicle was towed to the authorized Jeep dealership. The dealer inspected it and told me the problem was related to the auxiliary battery and repaired it. The problem has therefore occurred more than once and has been inspected/repaired by an authorized Jeep dealer. Jeep Customer Care has also been notified under Case #98217351. To my knowledge, police and insurance representatives have not inspected the vehicle because no collision occurred. I have not picked up the vehicle because I no longer feel safe driving it. An engine shutting off together with braking problems while the vehicle is moving creates a serious risk of a crash, injury, or death to me, my family, other motorists, and pedestrians. No one has been injured so far, but I believe we were extremely fortunate. I request that the federal safety agency investigate this repeated safety failure.

Filed Sep 9, 2026 · Engine · 75,000 miles · MI

The contact owns a 2026 Jeep Grand Cherokee. The contact had received an undisclosed recall; however, the recall repair was not performed while the contact was out of town. The contact stated that while driving at various speeds, the vehicle shuddered abnormally. The check engine warning light was illuminated after the failure. The vehicle was taken to a local dealer; however, it was indicated that the recall repair was claimed at another authorized dealer, LaFontaine Chrysler Dodge Jeep Ram Walled Lake (1111 S Commerce Rd, Walled Lake, MI 48390). The manufacturer was made aware of the failure. The failure mileage was approximately 75,000.

Filed Jul 13, 2026 · Engine · 788 miles · TX

The contact owns a 2026 Jeep Grand Cherokee. The contact stated that the check engine warning light illuminated and started blinking quickly before remaining continuously illuminated. The vehicle was jerking, and while it was in park, it vibrated excessively. The vehicle was taken to the local dealer; however, the cause of the failure could not be determined. STAR engineers later determined that the spark plugs were inoperable. The vehicle was repaired, but the failure recurred shortly afterwards. The vehicle was then towed back to the local dealer, but was not diagnosed or repaired. The contact requested a loaner vehicle, but the request was denied. The manufacturer had not been contacted. The failure mileage was approximately 788.

Filed Jun 30, 2026 · Engine · PA

I bought the vehicle less than 60 days when it had a major engine failure. The spark plug broke off into the engine and bounced around causing a failure. This is a known problem with this vehicle from the factory, from which I was not aware. At first they said they were putting a new engine in and now corporate is trying to get it out the door asap so they cant be forced to buy back the vehicle as a lemon, which I requested through corporate and started an arbitration process per the contract. The vehicle is being serviced at diehl of moon. The service manager there I am dealing with is James. They have had my vehicle since the check engine light came on and was flashing on June 17th.

Filed Jun 16, 2026 · Transmission · MO

After 3 months and less than 800 miles the service transmission light came on. While driving to the dealership, the engine light came on, followed by bells and buzzers. The dealership said our transmission valve connector was defective. It’s been there 2 weeks still waiting for the part to come in. We paid nearly 70 thousand for this vehicle and now there’s a transmission issue

Filed May 12, 2026 · Engine, Transmission · FL

First, after a trip of approximately 100 miles, the vehicle would not advance after stopping at a STOP sign. I had to shift from DRIVE to PARK and back to DRIVE before the vehicle would move. In the second case, again after a trip over 100 miles, primarily on the highway, the vehicle failed to shift out of first gear while the engine revved to over 7,000 RPM when I left an intersection. In that instance a warning light came up on the dash indicating RPMs in the red zone. Once again I had to pull over, put the vehicle in PARK and re-engage DRIVE before the vehicle would drive in a more normal fashion. It was the following day, when I entered the dealership for a service appointment, that the check engine light illuminated and the vehicle did not run smoothly. The service department determined it was a spark plug issue and claims the problem has been resolved. They also said this issue is fairly common on new (2026) Jeep Grand Cherokee models. There is less than 1,200 miles on the vehicle. I feel I was very lucky that the situation in both instances was relatively safe and there was minimal risk of injury, death and/or property damage. I have lost all confidence in the vehicle.