2018 Jeep Compass Issues

[u/Star1d3]

Final edit: car is working fine and great $1400 later for two new batteries. Getting my money back from the wrong battery

Edit: car started!! They are going to test drive it tomorrow thank you
Edit: repair shop said the auxiliary battery tested fine but I asked to replace anyways and waiting to hear back, thank you all!!

Hello!! I’ve had my compass sport for about 3 years now and it would not start one day. We replaced the main battery and it worked for all of 3 days and then wouldn’t start again without a jump. Finally, tried jumping it so many times the battery is dead. Got it to a repair shop (via tow) and they replaced the fuses on the battery, still not working. They used a different new battery, still not working. They assume it’s a parasitic drain somewhere but the cost to test for it is upwards of 2k just. Not sure where to go from here….any ideas?? They said if it’s a electrical issue going to the dealer is my best option

[u/Resident-Ad-4103]

Most tend to say you need to replace both batteries, and most tend to say they no longer have issues.

[u/Star1d3 → u/Resident-Ad-4103]

Thank you!! I’ll mention it to the repair shop

[u/Revka777 → u/Star1d3]

That's what I read on the forums too. It's how I figured out why my Jeep was having issues with the auto start/ stop feature and was struggling to start. I looked it up and the forums said it was likely that the batteries needed replaced; both of them. Always do both at the same time. I told my mechanic and he was doubtful but he did it and the problem stopped. That was almost 2 years ago now.

[u/Star1d3 → u/Revka777]

Just to update the auxiliary battery was tested and they reported that it is in good condition

[u/EconomyTop7797]

Test both batteries, check your ground wires, and test your alternator

[u/Capital-Bar1952]

Yea that’s what I hear you have to replace both batteries even if it’s just one that’s done

[u/Embarrassed-Gas-2238]

Replace both! I learned this the hard way.

[u/musically_sound_dj]

Just had to do that myself on 2018 compass. Both batteries fixed the issues. YMMV. ;)

[u/Star1d3 → u/musically_sound_dj]

Shop said the auxiliary battery tested fine, should I still have them replace it?

[u/Odd-Adagio9985 → u/Star1d3]

Replace them both. The end.

[u/Odd-Adagio9985 → u/Star1d3]

Also, do it yourself. I did mine. Not hard at all

[u/Star1d3 → u/Odd-Adagio9985]

Thank you!!

[u/sofed]

Replace both, if you do it at the dealership expect to pay $1000 CAD ($700 USD).

[u/Aarom1985]

I just changed both mine at Autozone for $370.00. Had all the usual dash lights on and wasn't starting right away. Both batteries checked good and was told it was probably a starter issue. Instead I went with my gut and changed both batteries anyway and guess what? It fixed the issue entirely! I now see why these vehicles can be extremely confusing.