In late November 2023 I noticed my fuel economy dropping a lot, from 27-29mpg to 22-24mpg. And, soon tailpipes were accumulating a lot of soot in tailpipes and soot was coming out of end of muffler. I took to JEEP dealer in Palestine, TX. See invoice uploaded. Service advisor couldn't find any bad codes. He wrote some guesses as to source/cause of problem & suggested using more expensive, higher grade of gasoline. He said to try some catalytic converter cleaner, also. Seems, he thinks the braking system may be causing soot troubles. This soot problem will cause injector, spark plug, catalytic converter expenses in future! And, I have to spend much more for gasoline? I think main control module is defective and is missing computer code to properly detect this problem or is intentionally designed to ignore the cause of the excessive soot problem. It is not normal to have soot in a new vehicle!!! I've worked on vehicles since 1950s until US Government mandated electronics made us weekend mechanics obsolete. I've seen soot in old cars, pickups, tractors, other engines; but in a properly running newer vehicle. Maybe rings are bad in this engine. Maybe sensors need to be replaces but main control unit is designed to ignore soot producing part(s). Maybe sensors do not work properly especially in cold weather and causes a too rich gasoline mix in engine. But, dealers only obey what codes tell them. This sounds similar to the VW scandal where VW intentionally made software that could evade emissions control tests. JEEP has made soot problem disappear whereby sensors do not see soot being produced by V6 JEEP engine because main control unit software code has been written to do such: EVADE DETECTION THAT CAUSES NO ENGINE LIGHT ERROR NOTICE IN DRIVERS DISPLAY AND NOTHING IN DEALERS INSPECTION/DIAGNOSIS SOFTWARE. HEAVY SOOT NOT DETECTED BY JEEP's ENGINE SENSORS AND MAIN CONTROL UNIT? In person can see more soot, photos don't show 3D depth as it really is.

- Palestine, TX, USA

Your website has some trouble & won't accept my jpg files. First time to see this. I use cruise control all the time on 3 vehicles I own. But, this JEEP has a strange problem that is not safe. Almost all vehicles I have driven with cruise controls will exceed set speed by 1~3mph while going down a steep hill. But my JEEP will exceed by 5~7mph on steep hills. I have turned off cruise control when it didn't control speed and drove manually for a while, then used cruise control again. If I set at 70mph, often speed will increase to 75~77mph going downhill; then brakes will engage strongly (hard braking) and JEEP will quickly go below 70 mph. JEEP will brake hard, go to or below 70mph then speed up some then brake hard again! Two-three times I had 18 wheelers behind me going down steep hill when I was using cruise control, JEEP quickly reached 75~77mph, then suddenly brakes clamped down with a lot of force and big trucks had to hit their brakes hard and were not far from my rear bumper. I do watch in rear view mirror often when driving. There are a lot of hills in my area of East Texas. I also watch out for smaller vehicles also when I use cruise control, especially going downhill. I took JEEP to a dealer Jan. 24, 2024 in Palestine, TX 75801 to check excessive carbon SOOT in tailpipes, coming out of muffler. And, I told service Mgr. about bad cruise control braking. They did nothing. Now, see Elliott JEEP dealer Service Invoice [XXX]. Dealer wasn't interested in looking a cruise control problem. He checked only excessive soot problem and maybe did a multipoint inspection. Also, this JEEP couldn't possible pass an EPA emissions control. I THINK THERE ARE SOME REAL DEFECTS IN MAIN CONTROL MODULE!!!! DEFECTIVE SPEED OR CRUISE CONTROL. DEFECTIVE AIR/FUEL SENSOR CONTROL MAKING A LOT OF SOOT. DISPLAY DEFECTIVE FOR GASOLINE & TEMPERATURE GUAGES IN DISPLAY. In 2023, I told different dealer about cruise control trouble and he didn't check anything, either. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT

- Palestine, TX, USA