Automatic Transmission Control Module problems of the 2015 Jeep Grand Cherokee

On the highway my 2015 Jeep Grand Cherokee diesel briefly stalled and the check engine light came on. I then lost all power and could only maintain a speed of 45mph in a 70mph speed limit highway. I turned on my flashers and could not get off the road due to construction and jersey barriers for several miles. When I had the opportunity I pulled off the side of the road and called to have my vehicle towed to a service facility. I was informed by the mechanic that scanned my car for trouble codes, a p0336-00 was set in my pcm. The mechanic informed me that I would have to take the vehicle to a Jeep Chrysler dealer. This is apparently a known issue with 2014 to 2018 Jeep grad cherokees equipped with the 3. 0l diesel engine including ram 1500s of the same vintage with the same diesel engine installed. The specific problem is that the crank shaft tone wheel is not read by the crankshaft position sensor because of degradation to the tone wheel which is connected to the crankshaft. I have complied with all safety and emission recalls. Related: rc-rw68-20 safety recall w68 transport canada 2020-371 loss of crankshaft position. Requires the replacement of the tone wheel. Issued 02/11/2021. Rc-rw58-20 safety recall w68 transport canada 2020-371 loss of crankshaft position. Requires pcm software update for loss of crankshaft position. In lieu of the tone wheel failing, the computer uses the camshaft position sensor. This is only designed to not disable the car completely but allow the driver to pull of the road. P0335-00 or p0336-00 wil be set and a check engine light will illuminate. My vehicle was not included in the nthsa safety recall and it should have been.

The contact owns a 2015 Jeep Grand Cherokee laredo. The contact stated that while driving at 5 mph, the vehicle independently shifted from drive to neutral. The check engine warning light illuminated. The vehicle was powered off and restarted and the contact was able to drive the vehicle home. The contact stated upon arrival home and in the driveway attempting to shift into the park position, the vehicle rolled backwards. The vehicle was taken to auto zone where it was scanned with a tcm clutch failure, a gear ratio clutch 1 and 2, and a failure with the output shaft speed sensor circle. The vehicle was taken to the dealer where it was diagnosed that the transmission needed to be replaced. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was 146,981.

I continue to have service shifter and check engine issues with my vehicle, which have been ongoing for the last three years. This has occurred while stationary, in motion both on city/neighborhood streets or on the highway. It's happened while turning and in park. When the check engine and service shifter lights come one, in many cases the car goes into limp mode and I lose the ability to accelerate, which causes a severe safety risk if it occurs while turning or going down the highway. Many times my dashboard will go completely black for seconds and my wind shield wipers will turn on. My car has been in the dealership for service related to this issue for 180 days over the past three years and they are unable to resolve the issue. They have replaced the steering control module, the tcm, the telemax communication module, the transmission, and the shifter, but the issue always comes back. Over the last six months the issues have gotten worse and the vehicle is getting more unsafe to drive. Based on my research there are a significant amount of these issues and fca should take action.

The vehicle stalls while driving on the highway. I will be driving on the highway at about 70 mph and sometimes the car will give a jerk when I accelerate and suddenly the vehicle slows down to a stop (gas pedal does not work to accelerate) the car shifts itself from drive to neutral and a message appears on the dash screen "put vehicle into drive". Sometimes the check engine light turns on and sometimes is does not. Once the vehicle has stopped I'm able to restart the car and drive again. This occurs again sometimes multiple times in one day or will happen once every week or so. I was told to change the tcm, battery, spark plugs and clean the fuel injectors and that did not solve the problem. I've been to multiple mechanics and Chrysler dealership service centers and they can never seem to duplicate the problem so they have no real answers as to why this is happening.

After we purchased the Jeep Grand Cherokee it was taken in for a recall for the tcm, to be serviced and have the power steering fluid checked for leaks due to the well being empty. We were then told when we picked up the vehicle and the power steering well was dry that all Jeeps are like that. After questioning that statement the tech went to vehicle and filled the well. After the dealership replaced the part, the vehicle will hold for 2 to 3 seconds then begin to roll back for 10 to 30 feet depending on the grade of the incline when in drive. It is an automatic with the hill start assist which does hold the brakes for the allotted time. The recall was for the vehicle to go into park if the driver takes off his seatbelt and exits the car in gear. That does work. The Jeep will continue to roll until it jerks itself into neutral then stalls the motor, it will continue to roll if the brake is not applied. Chrysler and the dealership continue to say that all vehicles (automatics) will roll back on an incline in drive and not stop until you apply the brake no matter the distance. We have discussed this issue with multiple Chrysler certified mechanics and they have stated that under any circumstance no automatic transmission should roll back more than a foot. The manager of the service department stated that all vehicles roll back no matter the distance. I stated my kia soul does not even move an inch backwards in drive on an incline, he responded with"yes it does". He then stated that "due to the lemon law we can not guess what is wrong, if we are fix it three times you can return the vehicle and the time we have put into your Jeep we are not getting paid for ". He also stated that our Jeep does not idle high enough and can not be adjusted and Chrysler says we are responsible to have control of the vehicle at all times. We don't want to return the Jeep we want it safe.

Vehicle started to jerk/hard shift and slip when shifting from 1-2 and 2-3 while driving on a city street. I took the vehicle into the dealer who replaced the valve body, ran the flash software update and reprogrammed the pcm. The dealer test drove the vehicle and indicated that the "trans shifts very smooth now". 20 miles later while I was driving the vehicle on city streets it began to clunk and jerk when deceleration at 30 mph and then again at 8 mph; much worse than before during acceleration. The vehicle also now lunges forwards and shakes when you come to a stop at a light/stop signs with your foot on the brake. I took the vehicle right back to the dealer who has ordered a new transmission. The vehicle only has 6500 miles on it. This vehicle is very unsafe with all the jerking and clunking and control issues. It appears these vehicles have transmission issues with no "fix" available; so I anticipate the same problem to occur when I get the vehicle back from the dealership with the new transmission.

The contact owns a 2015 Jeep Grand Cherokee. While driving various speeds, the shifter would erroneously shift out of gear and a hum was present coming from the transmission. Also, the display panel changed from drive and displayed a straight line. The vehicle began to hesitate and reduce speed. After stopping and switching the shifter back to drive, the vehicle operated normally. The vehicle was taken to the dealer where it was diagnosed that there was erratic transmission failure. The pcm, tcm, reh, and ipc were all reprogrammed. After retrieving the vehicle and driving, the vehicle would not accelerate on demand. The manufacturer was not notified of the failure. The failure mileage was 700.