Jeep Commander Forum banner

1 - 20 of 23 Posts

·
Premium Member
Joined
·
21 Posts
Discussion Starter #1 (Edited)
The other night i was driving home and the battery light came on. It turned off the fog lights.
When i got to the store i turned it off and went inside. When i came back out and started it up, I noticed the battery light wasnt on, but i had a little bit of a rough idle. NO OTHER LIGHTS ON.
I drove it towards home and after about 2 minutes the battery light comes back on. Drove fine. No noticeable acceleration issues. When i got home and put in in reverse to back in drive way, still had a noticeable rough engine.
Took it to the Auto Zone and had them check the battery/Alternator/Starter. ALL PASSED the check.
Every time i shut it off the battery lights goes out. Comes back on after 1-2 minutes of driving. Still notice rough idle especially in reverse. No check engine light. Only battery/

I cant get it into the dealership till the 22nd. I dont plan on driving it much till then, but anyone have any suggestions> PCM??
Just had a tune up/Plugs/ Oil Change last month.

2006 Commander Limited. 4.7 146000. No other issues runs & sounds great. Regular dealer maintenance.
 

Attachments

·
Super Moderator
Joined
·
5,763 Posts
The other night i was driving home and the battery light came on. It turned off the fog lights.
When i got to the store i turned it off and went inside. When i came back out and started it up, I noticed the battery light wasnt on, but i had a little bit of a rough idle. NO OTHER LIGHTS ON.
I drove it towards home and after about 2 minutes the battery light comes back on. Drove fine. No noticeable acceleration issues. When i got home and put in in reverse to back in drive way, still had a noticeable rough engine.
Took it to the Auto Zone and had them check the battery/Alternator/Starter. ALL PASSED the check.
Every time i shut it off the battery lights goes out. Comes back on after 1-2 minutes of driving. Still notice rough idle especially in reverse. No check engine light. Only battery/

I cant get it into the dealership till the 22nd. I dont plan on driving it much till then, but anyone have any suggestions> PCM??
Just had a tune up/Plugs/ Oil Change last month.

2006 Commander Limited. 4.7 146000. No other issues runs & sounds great. Regular dealer maintenance.
So I'm guessing you are not have any DTC's generated in the EVIC? Have you tried the "key dance" (you just have to turn the key on/off 3 times and then leave it at run) to check?

Right off the top of my head, there is a yellow wire that attaches to the starter that is known for corrosion which can cause battery/grounding issues; I'd check that wire and if you see ANY corrosion, disconnect your battery, disconnect that yellow wire and thoroughly wire brush and clean all the corrosion off of that yellow wire/connection and reconnect it, then reconnect your battery and see if there are any changes.
 

·
Registered
Joined
·
128 Posts
In addition to Blue's suggestions, I was getting this light intermittently after my engine rebuild.
Turns out I had broken the lock tab on the 2-wire harness that plugs into the alternator. NOT the main wire that feeds power to the battery. I guess these smaller wires feed voltage data and other alternator data to the PCM. Since I had broken that lock tab, the plug was loosing connection. I wasn't really loosing charging voltage to the system, but the PCM was thinking there was an alternator issue and giving me the little Lighting Bolt idiot light. So have a check of that plug, too.
 

·
Premium Member
Joined
·
21 Posts
Discussion Starter #4 (Edited)
Big Blue, It threw a DTC 0300 code (Cylinder misfire) last month which made me do the tune up/plug change at the dealership. (I have friends that work there. They treat me great)
The misfire engine light reset immediately after i shut it off and restarted it. I could definitely tell it misfired. Chug, chug, chug. It will do this sometimes IF i start it and throw it into drive too quick.
IF i start it and let sit for 3-4 seconds before selecting a gear, it runs GREAT. It does not do it everytime i do that. I just learned not to start and go as quick.
It has not thrown a code since then. been approximately 500 miles since then.
With the Battery Light & rough idle, there has been no engine codes at all.
 

·
Super Moderator
Joined
·
5,763 Posts
Big Blue, It threw a DTC 0300 code (Cylinder misfire) last month which made me do the tune up/plug change at the dealership. (I have friends that work there. They treat me great)
The misfire engine light reset immediately after i shut it off and restarted it. I could definitely tell it misfired. Chug, chug, chug. It will do this sometimes IF i start it and throw it into drive too quick.
IF i start it and let sit for 3-4 seconds before selecting a gear, it runs GREAT. It does not do it everytime i do that. I just learned not to start and go as quick.
It has not thrown a code since then. been approximately 500 miles since then.
With the Battery Light & rough idle, there has been no engine codes at all.
Did you check the yellow wire that attaches to the starter for corrosion?
 

·
Premium Member
Joined
·
136 Posts
Mine did this a while back. It ended up being the alternator failing. It was putting out too much not too little. The alternator was very warm as well. Took a while to diagnose failing "high". Check battery and serpentine belt if you need to replace alternator.
 

·
Premium Member
Joined
·
21 Posts
Discussion Starter #7
I work 12-hour days and I've been spending time with my wife. I've not been able to really look at the Commander yet. I plan on it this weekend at some point. I will check the yellow wire on the starter and I will also have the alternator checked again with the light still on. How would either of these conditions cause the rough idle? I find it odd that both of these conditions occurred it exactly the same time but I really don't know how they are related.

Sent from my SM-N910V using Tapatalk
 

·
Super Moderator
Joined
·
5,763 Posts
I work 12-hour days and I've been spending time with my wife. I've not been able to really look at the Commander yet. I plan on it this weekend at some point. I will check the yellow wire on the starter and I will also have the alternator checked again with the light still on. How would either of these conditions cause the rough idle? I find it odd that both of these conditions occurred it exactly the same time but I really don't know how they are related.

Sent from my SM-N910V using Tapatalk
I work 12 - 15 hour days 7 days a week, so, I know where you're coming from.

Corrosion on the yellow wire going to your starter could potentially cause a lower than normal voltage output coming from your battery, as well as a potential grounding problem which could affect your engine's idle and/or make it idle rough.

You also mentioned that your battery light comes on right? Often caused by lower than normal voltage coming from your battery.

I'm not saying that this is definitely the problem, but, it's something worth checking. If you don't want to check it, that's up to you - just trying to help.
 

·
Premium Member
Joined
·
21 Posts
Discussion Starter #9
Guess Imma have to put it off till next week. I guess we're leaving town tomorrow for our anniversary. Can you think of any reason not to really drive it? And other than the rough idle when you stop and the battery light it drives fine has been for two weeks now. I'm not taking it out of town but back and forth to work

Sent from my SM-N910V using Tapatalk
 

·
Registered
Joined
·
133 Posts
Can you think of any reason not to really drive it?
Not as long as you leave yourself time to walk to work if something finally fails.
You have warning signs of a failure, which is a luxury in my mind.
Usually when im in your situation, i throw my bike in the back, or on my rack, just so i can get to work if something goes wrong.
 

·
Registered
Joined
·
128 Posts
I will check the yellow wire on the starter and I will also have the alternator checked again with the light still on. How would either of these conditions cause the rough idle? I find it odd that both of these conditions occurred it exactly the same time but I really don't know how they are related.

Low voltage can cause all sorts of weird things in engines, especially with how complicated and computer based most engines are these days.


Blue is right about the corrosion. And that yellow wire seems to be the culprit for a few other completely unrelated issues that have popped up....ie: false Transmission Over Temp warnings
 

·
Premium Member
Joined
·
136 Posts
If it is the yellow wire most likely it will leave you stranded 1 day. "Normally" the yellow wire starts off as a no crank intermittent issue. I just replaced my harness once this started. 25K miles later no issues.
 

·
Premium Member
Joined
·
21 Posts
Discussion Starter #13
Well, The yellow wire was fine. The battery totally died, and found that the alternator was fried... even though it passed the test 2 weeks ago. Plan on putting it in this weekend.
We will see if that is all....
 

·
Registered
Joined
·
84 Posts
Well, The yellow wire was fine. The battery totally died, and found that the alternator was fried... even though it passed the test 2 weeks ago. Plan on putting it in this weekend.

We will see if that is all....


I worked at an auto parts store a couple decades ago and at least back then, the test equipment didn't always tell the truth. Not much of a surprise to me that your alternator tested good but ended up failing. Depending on what failed first, the battery may have taken the alternator out or vice versa. I've always liked having an amp gauge and volt gauge for knowing what's going on but amp gauges are rare in cars.


Sent from my iPhone using Tapatalk
 

·
Super Moderator
Joined
·
5,763 Posts
Well, The yellow wire was fine. The battery totally died, and found that the alternator was fried... even though it passed the test 2 weeks ago. Plan on putting it in this weekend.
We will see if that is all....
A bad alternator makes perfect sense Jeff, based on the symptoms you described;

The only reason I didn't mention that initially, is because you said you had it checked already and it checked out fine.

Easy day, if that's all it was.
 

·
Premium Member
Joined
·
21 Posts
Discussion Starter #16
I'll let you know how it goes. I'm working the whole weekend and I'm having a lot of fun driving the Challenger so probably next week. 20190525_192550.jpg

Sent from my SM-N910V using Tapatalk
 

·
Premium Member
Joined
·
21 Posts
Discussion Starter #18
Nice car Jeff, sounds good.


You pick up on the emergency lights in the grille in the visor?

It's really fun to drive! Really

Sent from my SM-N910V using Tapatalk
 

·
Super Moderator
Joined
·
5,763 Posts
You pick up on the emergency lights in the grille in the visor?

It's really fun to drive! Really

Sent from my SM-N910V using Tapatalk
Can't really see the lights in the grille/visor, but, I'll bet it's a blast to drive.
 
1 - 20 of 23 Posts
Top