Hi all, first post.

been a Def4/LR4 owner for…4 days. 2010, HSE, 173k on the clock. Prior owner gave me a literal FOLIO of receipts.

it came with two issues, air suspension compressor dying and a lack of TPMS.

So, planning ahead, I purchased the Gap IID Tool in order to get ahead of the curve.

Off the bat, I have been beset with issues. The first time plugging it in, no connection. My phone is literally taped to the tool at this point, and the are learning each other intimately (you catch my drift?). I elect to try it with the vehicle turned on and suddenly all hell breaks loose.

Suddenly I have errors galore; Stability Control, Parking Brake, Engine codes…the. I noticed the gas gauge suddenly dropping, revs dropping and then the screens went blank.

After I turned it off, I put the battery tender back on and let it charge for a bit. I luckily had another reader for another vehicle, and tried it out and it ran. A little sluggish but I ran and gave me the reports and I was able to clear the engine codes. I did notice there was a slight hiccup when I plugged it in.

I thought to try running the Gap unit with a power brick attached and boom it connects. I’m able to get it at least registered, but it does not compete tasks. I noticed that every so once in a while, the voltage doesn’t list anymore, and it will get hung up on tasks.

So, back to the drawing board. I pulled the fuse and it looks fine, and checked out the OFB2 and only noticed a small pin bent.

Any other ideas on what could be the cause?

The battery is a Feb 2022 so that should hopefully not be part of the problem.