HELP! Electrical issues. :(

[SabraLanae94]

I had similar issues with a 2019 JLU and they all went away after I replaced the Canbus.

Replaced it and its still doing the same thing minus all the gauges going crazy.

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[SabraLanae94]

Sabra,
Were both batteries replaced earlier this year? If your Jeep has Electronic Start/Stop, aka ESS, there's a second, smaller battery under the fuse box* that should be replaced at the same time the larger main battery is replaced. The ESS battery tends to wear out first, meaning it will cannibalize the main battery until both are replaced. A failing battery can often manifest as the source of seemingly unrelated electrical issues, such as a variety of warning lights illuminating at the same time.

*AKA the PDC, or Power Distribution Center (what you might've referred to as the "fuse array".)

The CANBUS terminals are the green and white plastic blocks behind the glove box door. Replacing both has occasionally solved similar electrical issues when other owners had the same dashboard display that you're currently seeing. Consider attending to them as the logical next step.

Only the main battery. I replaced the canbus today and it drove great until about 6 hours later and the check engine light came back on. Codes read lost communication tcm pcm master cyl high speed canbus dash isn't going crazy anymore still have the service shifter problem.

 

[Heimkehr]

I replaced the canbus today and it drove great until about 6 hours later and the check engine light came back on. Codes read lost communication tcm pcm master cyl high speed canbus dash isn't going crazy anymore still have the service shifter problem.

That could suggest that there's at least one plug that isn't properly seated in the new CANBUS blocks. Recheck your work.

One thing some owners have done is to turn the ignition on, without starting the engine. With the ignition in the On position, wiggle each wire individually on both CANBUS blocks. If you observe that the dashboard lights either come on or go out when wiggling a certain wire, that might be the culprit. We're reliably told that it doesn't matter into which terminal each wire is plugged into on each block, so perhaps moving the offending wire(s) to another, open space on the block might solve the communication issue.

Keep us informed here.

 

[SabraLanae94]

That could suggest that there's at least one plug that isn't properly seated in the new CANBUS blocks. Recheck your work.

One thing some owners have done is to turn the ignition on, without starting the engine. With the ignition in the On position, wiggle each wire individually on both CANBUS blocks. If you observe that the dashboard lights either come on or go out when wiggling a certain wire, that might be the culprit. We're reliably told that it doesn't matter into which terminal each wire is plugged into on each block, so perhaps moving the offending wire(s) to another, open space on the block might solve the communication issue.

Keep us informed here.

Thank you ill check it tomorrow. Hit a bump and that's when it seemed to do the service shifter light and my shifting started acting up. Everything else seems fine. Drives fine otherwise.

 

[tk1700]

Replaced it and its still doing the same thing minus all the gauges going crazy.

That sucks. @Heimkehr has some good suggestions. Good luck!

 

[Jeep Wick]

Thank you ill check it tomorrow. Hit a bump and that's when it seemed to do the service shifter light and my shifting started acting up. Everything else seems fine. Drives fine otherwise.

I have to wonder about the "bypass repair" your tech did "at the firewall." In realty, this is the large connector behind the passenger fender liner. Since you already did the canbus (I assume the one behind the glovebox), you should double check this guy's work inside that passenger fender. It's pretty easy to get in there, turn the wheel, just a couple clips and liner will move out of your way.

 

[SabraLanae94]

I have to wonder about the "bypass repair" your tech did "at the firewall." In realty, this is the large connector behind the passenger fender liner. Since you already did the canbus (I assume the one behind the glovebox), you should double check this guy's work inside that passenger fender. It's pretty easy to get in there, turn the wheel, just a couple clips and liner will move out of your way.

I am not super mechanically inclined. Im struggling. I have no idea what they did other than their notes. Im really pissed off that im having to continually deal with this. I know my jeep has alot of mileage ive driven and enjoyed it. But the dealership has been shady. Im considering taking it to a different one. Its alot to type out but this is my 3rd time going back.

 

[Jeep Wick]

I am not super mechanically inclined. Im struggling. I have no idea what they did other than their notes. Im really pissed off that im having to continually deal with this. I know my jeep has alot of mileage ive driven and enjoyed it. But the dealership has been shady. Im considering taking it to a different one. Its alot to type out but this is my 3rd time going back.

I hear you. I've yet to find a good dealer in my area. You might try making friends with your local Jeep community, check on facebook. I'm sure someone would be happy to take a look at it for free or point to you to reputable shop.

 

[SabraLanae94]

I hear you. I've yet to find a good dealer in my area. You might try making friends with your local Jeep community, check on facebook. I'm sure someone would be happy to take a look at it for free or point to you to reputable shop.

I thought about reaching out that way.

 

[SabraLanae94]

I wanted to update and let everyone know I took it to the dealer and the canbus was ok but two wires coming into it were fried so they replaced it. Fixed it for now.

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