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Discussion Starter · #1 ·
Hello,
My Daughter has a 2018 Jeep Compass. Recently, she called me and said that the car had multiple dash light on and that it would not move or moved very slowly (Limp Mode). When I got to the car, I pulled the engine codes and there were multiple pages of errors. I decided to pull the negative off of both batteries and then put them back on. The error codes cleared and after three starts, the check engine light went off as well. A few days later the problem happened again. This time I noticed that after I removed the negative cables the Start/Stop was still on. I did some research and decided that maybe the batteries were low (Original Batteries). I replaced both batteries and the problems seemed to go away. 5 days later they are back. I cannot believe that all of these codes are real.I am hoping someone can point me to a Ground Issue or something else that I can try. I don't even have a problem replacing the main control computer if that would fix it but I hoping I can get some good advice.

Thank you
Jim
 

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I would check the battery voltage under load and when the engine is off. If it’s lower than 14v with the engine running or lower than 12v with engine off, then it could be your alternator. It might not be keeping the batteries charged up. The lights go on when you get an under voltage event.
 

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Hello,
My Daughter has a 2018 Jeep Compass. Recently, she called me and said that the car had multiple dash light on and that it would not move or moved very slowly (Limp Mode). When I got to the car, I pulled the engine codes and there were multiple pages of errors. I decided to pull the negative off of both batteries and then put them back on. The error codes cleared and after three starts, the check engine light went off as well. A few days later the problem happened again. This time I noticed that after I removed the negative cables the Start/Stop was still on. I did some research and decided that maybe the batteries were low (Original Batteries). I replaced both batteries and the problems seemed to go away. 5 days later they are back. I cannot believe that all of these codes are real.I am hoping someone can point me to a Ground Issue or something else that I can try. I don't even have a problem replacing the main control computer if that would fix it but I hoping I can get some good advice.

Thank you
Jim
Any updat
Hello,
My Daughter has a 2018 Jeep Compass. Recently, she called me and said that the car had multiple dash light on and that it would not move or moved very slowly (Limp Mode). When I got to the car, I pulled the engine codes and there were multiple pages of errors. I decided to pull the negative off of both batteries and then put them back on. The error codes cleared and after three starts, the check engine light went off as well. A few days later the problem happened again. This time I noticed that after I removed the negative cables the Start/Stop was still on. I did some research and decided that maybe the batteries were low (Original Batteries). I replaced both batteries and the problems seemed to go away. 5 days later they are back. I cannot believe that all of these codes are real.I am hoping someone can point me to a Ground Issue or something else that I can try. I don't even have a problem replacing the main control computer if that would fix it but I hoping I can get some good advice.

Thank you
Jim
Hello,
My Daughter has a 2018 Jeep Compass. Recently, she called me and said that the car had multiple dash light on and that it would not move or moved very slowly (Limp Mode). When I got to the car, I pulled the engine codes and there were multiple pages of errors. I decided to pull the negative off of both batteries and then put them back on. The error codes cleared and after three starts, the check engine light went off as well. A few days later the problem happened again. This time I noticed that after I removed the negative cables the Start/Stop was still on. I did some research and decided that maybe the batteries were low (Original Batteries). I replaced both batteries and the problems seemed to go away. 5 days later they are back. I cannot believe that all of these codes are real.I am hoping someone can point me to a Ground Issue or something else that I can try. I don't even have a problem replacing the main control computer if that would fix it but I hoping I can get some good advice.

Thank you
Jim
Same exact problem here Jim. My jeep started to do the same as your daughter's. Mine now is not moving at all with multiple dash lights on including "Service Electronic Brake System". Any update? Did you fix it pr find the problem? Thanks
 

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Discussion Starter · #4 ·
Any updat


Same exact problem here Jim. My jeep started to do the same as your daughter's. Mine now is not moving at all with multiple dash lights on including "Service Electronic Brake System". Any update? Did you fix it pr find the problem? Thanks
Hi,
I have not found a solution as of today. I am investigating the Canbus wires as I have been told that when multiple systems say that they cannot communicate to the Canbus that this typically points to a wiring issue with the Canbus itself. I did find on another forum where the person had a similar issue and it was the wiring harness had rubbed against other metal and caused the Canbus wires to frey / short out. Unfortunately, I live in Michigan where it is pretty cold this time of year. So I have not had time to work on it. I have let my daughter use my other vehicle until we can figure this out. Please let me know if you happen ti find a solution as well.

Jim
 

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Hi,
I have not found a solution as of today. I am investigating the Canbus wires as I have been told that when multiple systems say that they cannot communicate to the Canbus that this typically points to a wiring issue with the Canbus itself. I did find on another forum where the person had a similar issue and it was the wiring harness had rubbed against other metal and caused the Canbus wires to frey / short out. Unfortunately, I live in Michigan where it is pretty cold this time of year. So I have not had time to work on it. I have let my daughter use my other vehicle until we can figure this out. Please let me know if you happen ti find a solution as well.

Jim
Here is what I found with my daughters Jeep Compass. Missing a nut at orange fuse

Motor vehicle Gas Auto part Nut Automotive fuel system
 

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Sooo replacing that nut fixed the problem?
Nothing connected to that end of the fuse. It's not needed for my trim/option level. You can see in my pic that there are cables connecter to the lugs below. Putting a nut on that will do nothing. Guessing the "bean counters" figured it was cheaper to build a fuse assembly with the 150 amp fuse and not use it was better than building/stocking two different assemblies.
 
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