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Old 01-10-2015, 10:35 PM
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Grinding Noise from my 2005 Grand Cherokee

Hey everyone,
I'm new to this forum so I'd just like to introduce myself first. I'm not sure if that's the thing to do or not, but hey. I'm gonna. My name is Christopher, I've had my WK for a little over a year now. She's a beautiful black beast, appropriately named Black Betty and hopefully I'll be able to share every modification I make to her with everyone here.

So now that that's out of the way, here is my dilemma. I've got this grinding noise coming from what seems to me like the transmission area. I've tried to record it and the only spot that gets the best ans loudest sound is on either side of the cup holders closest to the floor. I have an 05 Grand Cherokee 4x4 V6 with just under 155 on the odometer. I'll try to attach a video of it for you to here. But I've noticed that it's a high-pitched grinding noise that only happens when I am a pressing on the gas. It happens whether I am moving or not. It seems to go away until the next gear and it mainly occurs in all gears up until the 3rd. It doesn't get slower or faster depending on the speed, nor does it get louder or softer. I've recently had my transmission fluid checked and it's apparently on the up and up. I had my transmission 'rebuilt' shortly after getting my Jeep and if you have ever been to the place that I got it done at and met the people there you would understand the need for quotations around the word rebuilt. They're uber sketchy. The kind of business that is no longer there after you go the first time. But I digress. I've recently gotten two engine codes as well; the first one being a P0700 and the second a U0404. For the P0700 I know that it has to do with the Transmission Control System and the U0404 is Invalid Data Received from Gear Shift Control Module "A".

I tried to provide as much information as I thought would be relevant to the situation, so if there is anything else that I should be looking for, let me know and I will provide an answer to help with diagnostics.

Thank you.

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Old 01-11-2015, 07:50 AM
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Re: Grinding Noise from my 2005 Grand Cherokee

Is your jeep a 4x4?


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Old 01-11-2015, 07:55 AM
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Quote:
Originally Posted by Jason911 View Post
Is your jeep a 4x4?

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Yeah, it is.
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Old 01-11-2015, 04:26 PM
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Re: Grinding Noise from my 2005 Grand Cherokee

Check the bushings on the front differential. They are known for failure at over 100,000 miles. There are 3 of them and the front diff is suspended from them.


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Old 01-11-2015, 04:32 PM
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Quote:
Originally Posted by Jason911 View Post
Check the bushings on the front differential. They are known for failure at over 100,000 miles. There are 3 of them and the front diff is suspended from them.

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Could that cause the noise even when I'm in park and just revving?
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Old 01-11-2015, 04:37 PM
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Re: Grinding Noise from my 2005 Grand Cherokee

No - would most likely hear it only when there is a load on the engine. Very noticeable if in 4 Low


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Old 01-11-2015, 04:42 PM
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Quote:
Originally Posted by Jason911 View Post
No - would most likely hear it only when there is a load on the engine. Very noticeable if in 4 Low

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Well the noise comes whether I'm in park, neutral, reverse, or drive.
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Old 01-11-2015, 06:58 PM
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Re: Grinding Noise from my 2005 Grand Cherokee

Was the jeep scanned to see if there was any other code besides the P0700? The P0700 means that the TCM has set a fault code(s). Not sure if the U0404 will set the P0700 though.
There can be something mechanically wrong inside the transmission after the rebuild, but also for example a loose torque converter bolt (which holds the torque converter to the flexplate)
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Old 01-11-2015, 07:03 PM
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Quote:
Originally Posted by Frango100 View Post
Was the jeep scanned to see if there was any other code besides the P0700? The P0700 means that the TCM has set a fault code(s). Not sure if the U0404 will set the P0700 though.
There can be something mechanically wrong inside the transmission after the rebuild, but also for example a loose torque converter bolt (which holds the torque converter to the flexplate)
The only codes that were found were the ones that I gave. Should I have it taken to a transmission shop? That way they can check it out and see if it's on the up and up? I mean, I probably should for the TCM though anyway, right?
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Old 01-12-2015, 08:27 AM
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Re: Grinding Noise from my 2005 Grand Cherokee

So the noise is there when idling in Park and pushing the accelerator? The noise is not speed related, but is it engine rpm related?What do you mean that the transmission fluid is on the up and up?
Is it higher then suppost to?
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Old 01-12-2015, 08:36 AM
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Quote:
Originally Posted by Frango100 View Post
So the noise is there when idling in Park and pushing the accelerator? The noise is not speed related, but is it engine rpm related?What do you mean that the transmission fluid is on the up and up?
Is it higher then suppost to?
Well, I just got all my fluids checked and they're good. But it only happens when I'm pressing in the gas pedal. Whether I am moving or not.
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