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I have a 2008 Jeep Grand Cherokee with all available options…

Customer Question
I have a 2008 Jeep...
I have a 2008 Jeep Grand Cherokee with all available options (including V8 gas). Recently, having an issue with my turn signals.. They would flash fast on the dash, when going outside to look to see if there were blinking or not, they were not.. The next morning, I used my turn signal and it was operating normally.. When out side to look and sure enough just fine.. but while I was watching, they stopped.. Look at my dash and had the fast flashing..
Submitted: 10 months ago.Category: Jeep
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Customer reply replied 10 months ago
I cleaned my battery terminals, no help.
I replace all bulbs with new.. still does it..
Answered in 14 minutes by:
9/22/2017
Jeep Mechanic: Ricardo Hohl, Master Certified Tech replied 10 months ago
Ricardo Hohl
Ricardo Hohl, Master Certified Tech
Category: Jeep
Satisfied Customers: 4,343
Experience: Automotive instructor at Porter and Chester institute
Verified

Hi welcome to just answers my name is ***** ***** integrated module some times overloads and goes in to a fail safe mode , try rebooting the system by disconnecting both battery terminals starting with the negative first then the positive and touching both wire terminals together for 3 minutes then reconnect them starting with negative first then positive see if this helps .

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Customer reply replied 10 months ago
I tried that over the weekend.. Left them connected for 30 minutes.. At first, I thought it was working, was blinking fine.. then got the fast flashing again.
Jeep Mechanic: sprinkles08, ASE Certified Technician replied 10 months ago
sprinkles08
sprinkles08, ASE Certified Technician
Category: Jeep
Satisfied Customers: 24,206
Experience: Chrysler/Dodge/Jeep Master Certified, ASE Master and Advanced Certified, Trans and Hybrid Specialist
Verified

Hello and welcome to JustAnswer!

The turn signals are stopping either because of an open circuit, possibly a short to ground on the output circuits, or an internal failure in the front control module. If all lights come and go together then I'd suspect an FCM failure, but it's rare.

Are there any aftermarket electrical items on the vehicle?

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Customer reply replied 10 months ago
I do have a brake controller installed.. It is a removal-able type, will try that this morning.. I read before about the BCM so I had bought one for my make/model/year off ebay but absolutely nothing worked after I installed it.. Jeep was completely dead so I put my old one back in..
Jeep Mechanic: sprinkles08, ASE Certified Technician replied 10 months ago
Do you have a scan tool available?
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Customer reply replied 10 months ago
I do but its not the dealer scan tool..
Jeep Mechanic: sprinkles08, ASE Certified Technician replied 10 months ago

What fault codes are setting in the FCM?

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Customer reply replied 10 months ago
I've not been able to read the BCM.. only the ECM which has no codes..
Customer reply replied 10 months ago
I have a program called ScanXL Pro, but doesn't support Jeep.. Works awesome on my F350..
Jeep Mechanic: sprinkles08, ASE Certified Technician replied 10 months ago

You don't have a BCM.

What you're looking for is the front control module, FCM.

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Customer reply replied 10 months ago
I can't go this long without turn signals.. going to have to bring it to a dealer..
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