Hi guys, 2012 Jeep issues
02-06-2020, 04:52 AM
#1
JK Newbie
Thread Starter
Hi guys, 2012 Jeep issues
I just got this Jeep about a month and a half ago and it’s been great but I’ve noticed a few issues so let me begin. About a week after I got it I noticed it will die as soon as I put it in drive or reverse unless I let it run for about 10 min, once I start it back up it’s completely fine. Also sometimes when going up a slight to heavy hill it feels like it’s hanging out in 3rd to long if I lift the throttle it’ll shift and then it’s fine. thirdly just yesterday my cruise control quite working. If I’m in park the cruise will turn on but as soon as I move it shuts off. Is there anything that could tie these issues together? Please and thank you in advance for any info and help you may have.
ps Sunday two days before the cruise quite a friend of mine locked the keys in it with the lights on and disconnected the battery while waiting for a lock pop guy.
ps Sunday two days before the cruise quite a friend of mine locked the keys in it with the lights on and disconnected the battery while waiting for a lock pop guy.
Last edited by ArcticJKU; 02-06-2020 at 02:55 PM.
02-06-2020, 05:35 AM
#2
Super Moderator
Weak batteries are known to make the Jeep act quirky. As far as cruise goes- sometimes it will not function if you've got quirky inputs coming in from the wheel speed sensors. A sensor going may also create confusion with your shift points.
I'd check the easy things first though- how old is the battery and are the connections tight and clean from where they were disconnected? What's your trans fluid level. I have a manual so I can't help you here but someone can. Check that you've got clean fluid and that it's at the correct level.
I'd check the easy things first though- how old is the battery and are the connections tight and clean from where they were disconnected? What's your trans fluid level. I have a manual so I can't help you here but someone can. Check that you've got clean fluid and that it's at the correct level.
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ArcticJKU (02-06-2020)
02-06-2020, 06:01 AM
#3
JK Newbie
Thread Starter
Weak batteries are known to make the Jeep act quirky. As far as cruise goes- sometimes it will not function if you've got quirky inputs coming in from the wheel speed sensors. A sensor going may also create confusion with your shift points.
I'd check the easy things first though- how old is the battery and are the connections tight and clean from where they were disconnected? What's your trans fluid level. I have a manual so I can't help you here but someone can. Check that you've got clean fluid and that it's at the correct level.
I'd check the easy things first though- how old is the battery and are the connections tight and clean from where they were disconnected? What's your trans fluid level. I have a manual so I can't help you here but someone can. Check that you've got clean fluid and that it's at the correct level.
02-06-2020, 06:32 AM
#4
Super Moderator
If it is indeed the original battery, it wouldn't surprise me if it was just low enough to cause quirks. We've seen folks with 2015-2016's with bad batteries.
Speed sensors usually are good or bad, there's usually not much middle ground without throwing a code. You can use a Bluetooth dongle and Jscan app to verify they're all reading the same speed or very close. I had a wheel bearing on the way out which caused the sensor to sometimes work correctly which disabled my cruise without throwing a code. Again, when wheel bearing is something that could be an issue with it being a 2012. Luckily they're fairly cheap and fairly easy to replace if that ends up being the culprit.
Trans fluid was checked while it was running and warm? I believe you've got to cycle to neutral to check it accurately but surging in the trans usually is a fluid issue.
Speed sensors usually are good or bad, there's usually not much middle ground without throwing a code. You can use a Bluetooth dongle and Jscan app to verify they're all reading the same speed or very close. I had a wheel bearing on the way out which caused the sensor to sometimes work correctly which disabled my cruise without throwing a code. Again, when wheel bearing is something that could be an issue with it being a 2012. Luckily they're fairly cheap and fairly easy to replace if that ends up being the culprit.
Trans fluid was checked while it was running and warm? I believe you've got to cycle to neutral to check it accurately but surging in the trans usually is a fluid issue.
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ArcticJKU (02-06-2020)
02-06-2020, 06:51 AM
#5
JK Newbie
Thread Starter
If it is indeed the original battery, it wouldn't surprise me if it was just low enough to cause quirks. We've seen folks with 2015-2016's with bad batteries.
Speed sensors usually are good or bad, there's usually not much middle ground without throwing a code. You can use a Bluetooth dongle and Jscan app to verify they're all reading the same speed or very close. I had a wheel bearing on the way out which caused the sensor to sometimes work correctly which disabled my cruise without throwing a code. Again, when wheel bearing is something that could be an issue with it being a 2012. Luckily they're fairly cheap and fairly easy to replace if that ends up being the culprit.
Trans fluid was checked while it was running and warm? I believe you've got to cycle to neutral to check it accurately but surging in the trans usually is a fluid issue.
Speed sensors usually are good or bad, there's usually not much middle ground without throwing a code. You can use a Bluetooth dongle and Jscan app to verify they're all reading the same speed or very close. I had a wheel bearing on the way out which caused the sensor to sometimes work correctly which disabled my cruise without throwing a code. Again, when wheel bearing is something that could be an issue with it being a 2012. Luckily they're fairly cheap and fairly easy to replace if that ends up being the culprit.
Trans fluid was checked while it was running and warm? I believe you've got to cycle to neutral to check it accurately but surging in the trans usually is a fluid issue.
02-06-2020, 02:41 PM
#6
JK Jedi
our batteries are often good for 2 years. Anything more than that and you're livin on borrowed time in my experience. Mind you, I buy reg ole whatever is available batteries (need a battery, what store is close by? kinda thing). I'd be a little concerned about the transmission issue, specifically the shifting out of park and reverse thing. Have the axles been regeared that you know of? I can see the jeep sticking in third being gear related. I've had different sets of gears hold for much longer than desired when stomping on it.....like getting on the interstate it would stay in 3rd gear for a REALLY long time. If that is happening with stock gearing it that would seem a little odd.
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ArcticJKU (02-06-2020)
02-06-2020, 02:52 PM
#7
JK Newbie
Thread Starter
our batteries are often good for 2 years. Anything more than that and you're livin on borrowed time in my experience. Mind you, I buy reg ole whatever is available batteries (need a battery, what store is close by? kinda thing). I'd be a little concerned about the transmission issue, specifically the shifting out of park and reverse thing. Have the axles been regeared that you know of? I can see the jeep sticking in third being gear related. I've had different sets of gears hold for much longer than desired when stomping on it.....like getting on the interstate it would stay in 3rd gear for a REALLY long time. If that is happening with stock gearing it that would seem a little odd.
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02-06-2020, 03:04 PM
#8
JK Jedi
These gear charts are pretty accurate -
You need to measure the ACTUAL height of your tires though, not just what is stamped on the sidewall. Get the jeep up to 70, look at the RPMs, and reference the chart. Good info for you to know regardless.
You need to measure the ACTUAL height of your tires though, not just what is stamped on the sidewall. Get the jeep up to 70, look at the RPMs, and reference the chart. Good info for you to know regardless.
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ArcticJKU (02-06-2020)
02-06-2020, 03:53 PM
#10
JK Newbie
Thread Starter
So I just tested the battery and my battery is rated at 750 cca test results can back 836 cca at 12.73v temp of battery at test 105deg. Tester says good battery. Had the alternator tested and results are 14.22v no load 14.20 with load. (Headlights on high beam, radio on and heater on high.
to add to my confusion on my way home from work I got a check engine light maybe 10min from work. PO128 coolant temp below threshold... smh can’t see any other way these could be connected other than battery or charging system....
to add to my confusion on my way home from work I got a check engine light maybe 10min from work. PO128 coolant temp below threshold... smh can’t see any other way these could be connected other than battery or charging system....