Jeep Commander Forum banner

1 - 15 of 15 Posts

·
Registered
Joined
·
26 Posts
Discussion Starter #1
I've noticed an issue recently: my headlights have a slight flicker. Doesn't seem to be happening all the time, I notice it most in the mornings when I'm sitting in traffic. I also get an occasional dimming and slight drop in RPMs when idling. In the 2+ years I've been driving this thing, it's stalled once or twice when this happens.

Any thoughts on what might cause and/or remedy this?
 

·
Registered
Joined
·
371 Posts
I had one instance where my headlights flashed on and off for about a half hour this summer. I did some reading and found that the ignition switch and multifunction switch could cause the issue. I picked up a new ignition switch because my easy egress function was also intermittent so it seemed like it was the more likely choice but the problem never happened again.
 

·
Banned
Joined
·
105 Posts
By flicker what do you mean?
I’m working on trouble shooting a car right now that has what the driver calls a flicker, what it does is the dash lights and headlights slightly dim and come right back. We are looking at the battery and alternator, which can be tested. Also considering the multifunction switch (headlight switch) and body grounds. It’s not a Jeep but troubleshooting is similar.

Not sure what Year and engine commander you have, in this app I don’t see anything but the main post.
On our 2006 3.7 Commander I’ve noticed at stoplights lower RPM and almost a stall, then it self corrects. There does seem to be a electrical component, like maybe a dip in alternator voltage, however I’ve replaced: alternator, battery, ground straps, ignition coils, crank and cam position sensors (with mopar ), headlight switch, flushed transmission fluid, and randomly it’ll still do the rpm drop and recovery at a stop light. Headlights, A/C, blower motor, rear air, nothing actually seems to contribute.
It’s a common problem to these years jeeps.
The alternators on the commanders are pretty high output so it really shouldn’t be a demand problem unless the PCM is not adjusting the voltage correctly.

Transmission fluid level fixes the issue for some, or they say it does, theory is the torque converter needs proper amount of fluid to spin freely at idle. A few have said bad transmission or torque converters were their problem.

Another of the theories is weak CPS signal causing the PCM to do something that causes this. It wasn’t so in my case.

I don’t know, what I think contributes is the rpm is so low, 550, that slight changes can affect it more noticeably than in other vehicles with higher rpm at idle.


Not sure how bad your flicker is, depending on how bad it is it might suggest a place to start. Otherwise the trouble steps shooting I listed we are doing for another car are a good place to start. I wouldn’t replace all the parts I did, some of it was to troubleshoot this issue but most of it was in the course of general maintenance..




Sent from my iPhone using Tapatalk Pro
 

·
Registered
Joined
·
26 Posts
Discussion Starter #4
It's an '07 Hemi (in my sig :))

The flicker is really slight, you have to be looking for it to notice. The dimming comes every so often while idling, or coasting to a stop. There's a slight dip in RPMs as this happens too. I've noticed a similar dimming when putting the windows down. Almost seems like my battery (which is barely a year old) doesn't have enough juice to fully power everything.

I've got no mods, other than the stereo, which is a Pioneer AVH-1330.

I'm not an electrical genius, but are there better options for a battery that might supply a bit more current? I'm getting ready to swap out the plugs. Maybe I should change coils and wiring while I'm at it?
 

·
Banned
Joined
·
105 Posts
If the battery is New I doubt it but it can be tested.
The battery cranking amps is a fairly strong, i think all GC and XK jeeps have H7 batteries. If you want to you can modify the battery tray for a more powerful H8, but I doubt it’s do anything for this issue.
I just replaced our battery and it still did this rpm hiccup at a red light not running any accessories and no headlights just a foot on the brake.

On the car we are trying to fix for a friend it is doing exactly the flickering you are describing and we are pretty sure it’s the alternator, we can see the voltage drop as it flickers but we are going to be cleaning and testing a few other things before dropping a few hundred for a rebuilt alternator. But her car doesn’t stall.

On the Hemi engine I’m not too sure what going on there far as coils and other things.
Spark plugs are not a bad idea if you don’t know how many miles are on them, ignition coils I’d leave alone unless they fail, they are usually pretty good quality and if you replace them then Mopar or Low milage used are the best bet, the Chinese knockoffs sold at places like auto zone often fail after a little while. Oh BTW spark plug don’t have to be anything fancy exact OEM make these engines the happiest.

I can’t remember if the Jeep PCM has voltage in the OBD2 readout, I’d think it does. This might be a way to check what the voltage does when it stalls.

Im not confidant in the solution for the Commander because ours with all those new parts still does it, also the alternators at least on the 3.7 &4.7 are 160 amp Nippondenso which OEM are high quality, no internal voltage regulator the PCM controls it.
Battery, alternator, battery cables might cause the flickering, and the stalling if we assume they are connected. If they are not it could be Crank or Cam position sensors,

And throttle body, I think 2007 went from cable to electronic control, so an electric actuator moves the throttle instead of your foot, if that or idle air controller are messed it could cause a stall.

But I know what you mean about the seeing a drop in power and the rpms act like it’s going to stall, I would think those two events are connected. Ours never stalls and is a different engine, so I’m not sure how much is the same for your engine.

If you still suspect it and if the alternator is easy to get at maybe pull it and get it tested out side the vehicle. The test with the vehicle running at auto zone can help but for something like this it might not find the cause if it happens randomly.





Sent from my iPhone using Tapatalk Pro
 

·
Banned
Joined
·
105 Posts
Check out this thread, http://www.jeepcommander.com/forums/9-problems-dealer-service/27890-2007-jeep-commander-5-7-hemi-stall-issue.html#/topics/27890?page=1

I’m not sure if it’s the same kind of stallling but the OP of that thread did the trouble shooting complete with mopar part numbers, answer was the wrong spark plugs. Even if it’s not the same problem it is a better guide in trouble shooting


Also has your commander had the ignition switch recall done?


Sent from my iPhone using Tapatalk Pro
 

·
Registered
Joined
·
26 Posts
Discussion Starter #7
Check out this thread, http://www.jeepcommander.com/forums/9-problems-dealer-service/27890-2007-jeep-commander-5-7-hemi-stall-issue.html#/topics/27890?page=1

I’m not sure if it’s the same kind of stallling but the OP of that thread did the trouble shooting complete with mopar part numbers, answer was the wrong spark plugs. Even if it’s not the same problem it is a better guide in trouble shooting


Also has your commander had the ignition switch recall done?


Sent from my iPhone using Tapatalk Pro
Yes, the ignition switch has been replaced. I have a new set of plugs (Champion 570s) I'll swap in soon. Hopefully that's all it is...
 

·
Super Moderator
Joined
·
5,845 Posts
It's an '07 Hemi (in my sig :))

The flicker is really slight, you have to be looking for it to notice. The dimming comes every so often while idling, or coasting to a stop. There's a slight dip in RPMs as this happens too. I've noticed a similar dimming when putting the windows down. Almost seems like my battery (which is barely a year old) doesn't have enough juice to fully power everything.

I've got no mods, other than the stereo, which is a Pioneer AVH-1330.

I'm not an electrical genius, but are there better options for a battery that might supply a bit more current? I'm getting ready to swap out the plugs. Maybe I should change coils and wiring while I'm at it?
@MrFisher;

Please add your current mileage to your profile information.

To update your profile, click on your username above your avatar and select the "View Public Profile" tab and click on "About Me" and you will see the block for "Current Mileage.".
 

·
Super Moderator
Joined
·
5,845 Posts
Yes, the ignition switch has been replaced. I have a new set of plugs (Champion 570s) I'll swap in soon. Hopefully that's all it is...
Also, you would be better served getting a set of replacement spark plugs straight from Chrysler - it's pretty well documented that certain after market plugs will cause problems, particularly on a Hemi.
 

·
Registered
Joined
·
26 Posts
Discussion Starter #10
Still haven't gotten around to the plugs, I'm thinking I'm gonna swap out the alternator as well, hopefully this weekend. Is there anything out of the ordinary I need to know? Looks like a pretty straightforward job (as alternators should be)...

I'm seeing a couple Duralast options from AutoZone, one has a much higher core charge. 160 amps which looks to be 10-15 amps higher than some others (Napa, Bosch...)
 

·
Registered
Joined
·
26 Posts
Discussion Starter #11
Updating...

No, I STILL haven't changed plugs... (Maybe that's my problem...)

The other night while driving, I got a couple really quick stalls/skips. The wipers kicked on and I believe the ESP/BAS lights on the dashed flashed on, but it was so quick I couldn't catch a look in time. The heep didn't completely die, just a really quick hesitation/skip/loss of power that was gone in just over an instant. Meanwhile, there was some dimming and flickering of the headlights as I continued to drive.

Now, several days later, I'm on my way in to work and it happens again. This time it is followed by a complete shutdown. No power anywhere. Engine dies, all electrical dies. Stereo shuts off and is completely reset. I sit for a few seconds on the side of the road, turn the key, and it starts right back up. I drive away and it is fine for the rest of the commute.

This seems really weird, like it is more than just a failing alternator or battery, but again, I'm far from an expert on such things.

Additional thoughts? Anyone else experience these symptoms?
 

·
Registered
Joined
·
141 Posts
Have you ever tried checking all the connections on the starter ?
Really get down in there deep and physically inspect the wires and connections.And clean?
Or remove the starter and have it tested?
Updating...

No, I STILL haven't changed plugs... (Maybe that's my problem...)

The other night while driving, I got a couple really quick stalls/skips. The wipers kicked on and I believe the ESP/BAS lights on the dashed flashed on, but it was so quick I couldn't catch a look in time. The heep didn't completely die, just a really quick hesitation/skip/loss of power that was gone in just over an instant. Meanwhile, there was some dimming and flickering of the headlights as I continued to drive.

Now, several days later, I'm on my way in to work and it happens again. This time it is followed by a complete shutdown. No power anywhere. Engine dies, all electrical dies. Stereo shuts off and is completely reset. I sit for a few seconds on the side of the road, turn the key, and it starts right back up. I drive away and it is fine for the rest of the commute.

This seems really weird, like it is more than just a failing alternator or battery, but again, I'm far from an expert on such things.

Additional thoughts? Anyone else experience these symptoms?
Sent from my Samsung Galaxy, using speech to text
 

·
Registered
Joined
·
26 Posts
Discussion Starter #13
Have you ever tried checking all the connections on the starter ?
Really get down in there deep and physically inspect the wires and connections.And clean?
Or remove the starter and have it tested?


Sent from my Samsung Galaxy, using speech to text

I have not. I guess I will give that a shot when I'm changing my oil next week. I'm now intent on changing plugs while I'm at it.

I wasn't aware a bad connection or wiring to the starter could affect the entire electrical system, causing a complete shutdown while driving...
 

·
Registered
Joined
·
141 Posts
One little electrical problem can cause a domino effect. You wouldn't believe a very tiny problem can cause so many things to happen. But most importantly it's a Chrysler product, so count on it.
I think I would start there. If you can get it on a lift. So you can be comfortable looking at your starter and the wiring.Even take it apart and clean it. Especially in your neck of the woods, if they use corrosive chemicals on the roads for deicing.
Good luck.

Sent from my Samsung Galaxy, using speech to text
 

·
Registered
Joined
·
5 Posts
When I had that happen, I had the battery tested right away because the dealership I bought it from was telling me there was nothing wrong with it (well their stupid scanner was telling them nothing.) I have noticed recently looking at the cables leading from my battery (and probably not on yours) that the leads are kinked, some even looked dangerously frayed. Now I don’t know how they got to be that way and how I have never seen it before, but maybe look at the terminal and the leads from your battery as well. Might be stupid but just a thought:)
 
1 - 15 of 15 Posts
Top