Check Engine Light - 2.1 SoF Bus b0 Panel Open - : Jeep Wrangler JK Forum
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post #1 of 2 Old 07-10-2018, 07:24 AM Thread Starter
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Check Engine Light - 2.1 SoF Bus b0 Panel Open

First, I realize that Iím going to be asking a TJ question. But I started with Jeeps with (3) different JKs, and most of the friends Iíve connected with over the years have been here on JKO. So, Iím posting this here on the bunch that some other JK owners, may have also had experience with TJs. So here we go...

Iíve been building a stretched TJ for some time now, and Iíve run into a ridiculous problem. Iíve been a little reluctant to post this, mostly out of embarrassment, but I need help, and so here we go.


I was wiring in an Amp for the rear cage speakers, when my better half said, if you hurry, you can join us at our friendís pool.

Well, I had soldered all of the Speaker wire, Positive, Negative, and Remote wires, and used shrink tubing on (most of) those wires because I didnít want to half ass anything.

Well, the distracted me glanced at that wiring, threw on a zip tie to the bundle, pushed the stereo and amp back in, and grabbed my swim trunks.

When I started the engine, the stereo came on, followed by a zap, pow, pop, brzzt, the stereo then stopped playing, and the check engine light came on. Crap!

So I pulled things apart and wouldnít you know it, but the one wire that I overlooked shrink-wrapping was the 4 gauge positive cable going to the amp.

I removed the amp, as it is now in permanent fault mode, and I believe one of the speakers is blown. But, no other fuses appear to be blown. Now then, I couldnít check this small square looking fuses or relays (with clear tops) in the engine bay, but Iím not even sure what they are.

So, I pressed the odometer and turned the key on to see if I could get a code and this is what came back:

ď2.1 SoF b0 Bus Panel OpenĒ

I Googled this, and I thought that this led to the instrument cluster connection or the left multi-function switch, so I removed the instrument cluster, cleaned the connections, and reseated/reconnected it. Then I swapped out the left multi-function switch for a brand new one. No change.

I canít seem to figure this out. Has anyone run into to this? Any leads or ideas?

Thanks in advance!


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post #2 of 2 Old 07-11-2018, 11:22 AM
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Check all the relays/fuses. You may be lucky

If you have access to a good diag/reader that would be even better to diagnose/save some time.

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