If the MPC guy admitted that they had some reversed wiring it's very likely that you did damage some of the electronics. Unfortunately it won't be easy to diagnose without proper test equipment. And the cost of the repairs can be quite significant.

You may be very lucky and the issue is just a few burned fuses. Start by inspecting your fuses one by one. Don't just inspect them visually, test them with a DMM. Check the fuse boxes under the hood and under the dashboard. Again, if you are really very extremely lucky, it may be a fuse or two.

But if the defective MPC product caused the damage to one or more ECUs, I would consider contacting a lawyer because the diagnostics and repair costs can be thousands. You want MPC to pay for that.

 

Also:

Check your car battery. You may have drained it while trying to install the remote starter. Are you able to start your engine?

Check the harness connection again, bent pin, loose connection, etc.



Sent from my SM-G973U1 using Tapatalk

 

Please let us know what your outcome is ! Been watching the install videos and reading pretty good reviews about MPC remote start at Amazon. I was very close to purchasing the exact same item but now I’m leery.

 

If I'm not wrong, MPC repackages the Fortin remote starter module which I have installed in my 2017 HL XLE (my review). I remember during my installation, I reversed the power connector and bent a pin but even then I didn't fry anything.

 

following.. getting my 19 limited tomorrow and need remote start. I was planning on a MPC remote as my wife does not want another fob..

 

There is another one on Amazon called StartX most reviews are positive and it’s cheaper than the MPC model

 

I have install StartX and it start vehicle with remote but the minute i installed this it throw a code of B2285,U0100,U1117,P160400,U0100 i have wait for 20 days to clear all the codes byitself but it did not. call startX but no help. I return it before 30 days at amazon. the minute i uninstalle startX those codes are gone except one of it which i didn't remember.Stay away from any after market-accessories.

 

I have the MPC unit with the cell chip on my 2017 Highlander XLE. No issues with installation. Sorry to hear that you have had issues. Hopefully it's something small/simple to fix.

 

I think its mainly a hybrid issue. I too have the MPC unit and it took maybe 10 minutes to install? 0 issues.
Sorry about the bad luck with that unit

 

Go with 12V solutions and never have to deal with that.. They stand behind their products unlike this company. I think you are screwed and out of luck

 

I have the 2018 Highlander, not hybrid, and I purchased the start X remote, which looks pretty much identical to the MPC. I installed it, and I am having the same problems with the electrical system that you’re speaking of what was the repair that it took to fix.

 

Your best bet is to put it back to stock and have it towed to toyota... sorry it sucks but best way to go

I installed an mpc on my 2018 xle a couple months ago and its great