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Service AWD light keeps coming on.

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Service AWD light keeps coming on.

Old 10-10-2019, 09:29 PM
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Default Service AWD light keeps coming on.

Chrysler 300 AWD, SERVICE AWD keeps coming on but there are no codes in the car computer. I looked online and found comments that if it stays on after you shut the car off and restart it than there is a problem. It comes on every couple of days but doesn't stay on when I restart the car. I called a local dealer and they don't know what the problem could be if there are no codes in the computer.

Any mechanics on THT that can tell me what I should do, or any owners that have experienced this that have a suggestion on what the problem could be? Winter is coming soon and I don't want to have any problems with the AWD in the snow.

I know it's a long shot that anyone can help but doesn't hurt to ask.
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Old 10-10-2019, 09:45 PM
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Sounds like a loose connection somewhere. You need to pay attention to see if a certain bump or turn or acceleration gets the light to come on. Then take it to your mechanic or dealer and have them go for a ride with the scanner hooked up and hopefully you can get the light to come on and hopefully the scanner sees the code.
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Old 10-10-2019, 09:48 PM
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What answer do you want? Drive it until the vehicle no longer works or take it into the dealer and have them find and fix the problem? If you are not climbing around under a vehicle to do your own oil changes I highly doubt you'll be on your back under a dash trying to fix anything.
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Old 10-10-2019, 11:33 PM
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AWD transfer case is getting hot and slipping. ECM recognizes differing input shaft rpm to wheel rpm and sets a CEL or AWD. Sometimes they just flash. Usually sets a grey code which most readers can see.
Dealer can pull the other codes not available to non proprietary code readers.
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Old 10-10-2019, 11:34 PM
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Please don’t take that seriously, I just made it all up.
Sounded good in my mind.
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Old 10-11-2019, 05:18 AM
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What code reader are you using?
Are you using it while car is running?
I don't know Chrysler (cough cough) but could it be a service interval light?

Have you changed tires recently?
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Old 10-11-2019, 05:28 AM
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Russ, do you think it's one of those maintenance minder kind of things? Like when your car let's you know it's coming up on needing an oil change. Are there any maintenance items required for your AWD system? Like a transfer case fluid change or something like that. Perhaps it thinks one of those services are due.

Maybe there's a sensor for that AWD system that's acting up.

Don't know. Just trying to brain storm.
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Old 10-11-2019, 05:34 AM
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Have it scanned with a reputable tech with a good scanner or try the freebie route a AutoZone and post the code and I'll give you further info.....
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Old 10-11-2019, 06:48 AM
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It needs to be hooked up to a data reader not a scan tool. Then you'll see where the data going to the ECU to turn on the light is coming from. A good garage or a dealer will have that.
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Old 10-11-2019, 06:55 AM
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Originally Posted by mikefloyd View Post
It needs to be hooked up to a data reader not a scan tool. Then you'll see where the data going to the ECU to turn on the light is coming from. A good garage or a dealer will have that.
1. Retrieve codes and review, if it is an action code switch scanner to data and live action....I have the Snap On which does it all....also Mac others for quick video reads for free
True diagnosis requires scan clear test drive and lift and inspection for a thorough job
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Old 10-11-2019, 10:30 AM
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Originally Posted by Lprizman View Post
1. Retrieve codes and review, if it is an action code switch scanner to data and live action....I have the Snap On which does it all....also Mac others for quick video reads for free
True diagnosis requires scan clear test drive and lift and inspection for a thorough job
Yep hard to fix a problem until you identify what's wrong.
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Old 10-11-2019, 10:50 AM
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Originally Posted by rocksandblues View Post
What code reader are you using?
Are you using it while car is running?
I don't know Chrysler (cough cough) but could it be a service interval light?

Have you changed tires recently?
Yes I tried reading any errors while car was running and no errors. No I haven't changed the tires, they are the tires that came on the car.
Originally Posted by Brad1 View Post
Russ, do you think it's one of those maintenance minder kind of things? Like when your car let's you know it's coming up on needing an oil change. Are there any maintenance items required for your AWD system? Like a transfer case fluid change or something like that. Perhaps it thinks one of those services are due.

Maybe there's a sensor for that AWD system that's acting up.

Don't know. Just trying to brain storm.
i looked in the manual and online and I didn't see anything service related that was due.

Originally Posted by mikefloyd View Post
It needs to be hooked up to a data reader not a scan tool. Then you'll see where the data going to the ECU to turn on the light is coming from. A good garage or a dealer will have that.
My scanner also reads all of the information coming out of the computer while the car is running.
Originally Posted by Lprizman View Post
1. Retrieve codes and review, if it is an action code switch scanner to data and live action....I have the Snap On which does it all....also Mac others for quick video reads for free
True diagnosis requires scan clear test drive and lift and inspection for a thorough job
There are no codes stored or showing when I have the reader connected to the car when it's running. All of parameters are showing normal.

I suppose I will have to bite the bullet and take it to the dealer. I predict they will spend 3/hours of billing, a diagnosis charge $79.99, and still won't tell me what the problem is.
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Old 10-11-2019, 10:50 AM
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You'll need a scanner that can read more than just the ECM
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Old 10-11-2019, 10:57 AM
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Originally Posted by Garett View Post
What answer do you want? Drive it until the vehicle no longer works or take it into the dealer and have them find and fix the problem? If you are not climbing around under a vehicle to do your own oil changes I highly doubt you'll be on your back under a dash trying to fix anything.
I'm leaning towards letting something break so I know what the problem is. I happen to do all of electrical work on my vehicles including my boats. I know the under side of my dash very well.

I do change my own oil in my truck, I don't on my other vehicles. I can't get a jack or ramps under my Camaro or else I probably would do it myself. Is it bad to have someone change the oil in your vehicles? If not than why did you bring it up? I can afford to have it done and I don't feel comfortable under a car on a jack or ramps.
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Old 10-11-2019, 11:06 AM
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Does your scanner have the ability to show you the mph of each wheel while driving?
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Old 10-11-2019, 11:37 AM
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What year is the vehicle? As someone else said it almost sounds like a loose connection. Possibly a grounding issue. Considering you live farther north you most likely experience more snow, ice, and salt on the roads which could cause some corrosion on a ground wire. Another possibility could be an older or weakening battery which can cause strange things to happen with the electrical system. Or it could be something as simple as a faulty wheel speed sensor. If it is happening frequently enough to replicate I would probably just take it to the dealer and let them drive it and it should be easy enough to diagnose.
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Old 10-11-2019, 11:47 AM
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Originally Posted by RussH View Post
I'm leaning towards letting something break so I know what the problem is. I happen to do all of electrical work on my vehicles including my boats. I know the under side of my dash very well.

I do change my own oil in my truck, I don't on my other vehicles. I can't get a jack or ramps under my Camaro or else I probably would do it myself. Is it bad to have someone change the oil in your vehicles? If not than why did you bring it up? I can afford to have it done and I don't feel comfortable under a car on a jack or ramps.
Probably a wheel speed sensor etc. You can't pull codes from just the main ecm. Case in point, I can tune my suburban and see ecm codes for performance stuff, but I can't use it to pull suspension codes. Take to a dealer or reputable shop for the $100 fee and they can tell you whats wrong with it.

What I do at my buddy's shop, show up with a dozen dunkin donuts for the his shop guys, and guess what, my buddy scans it and says whatever is wrong is X and schedule it for $ and it'll be fixed. Donuts are much cheaper than a typical diagnostics scan if its easy to figure out from the code and common.
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Old 10-11-2019, 01:42 PM
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Originally Posted by RussH View Post
My scanner also reads all of the information coming out of the computer while the car is running.
It's the information going into the ECM that will identify the problem.

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Old 10-11-2019, 01:48 PM
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Bad wheel bearings caused this on my chevy.
Service 4wd light.
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Old 10-11-2019, 02:56 PM
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Any tires larger/smaller than the others. Or have you added a new tire to a set of older tire?
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