Gear box will not engage gears at all?

Tiny
ANDRIN ATEM
  • MEMBER
  • 2007 DODGE CHARGER
  • 3.5L
  • 6 CYL
  • 2WD
  • 16,735 MILES
Hi Ken, please can I get the power ground and signals wiring from the fuse box to the transmission, and from the transmission module to the transmission.
Wednesday, March 26th, 2025 AT 10:53 AM

24 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,144 POSTS
Hello Andrin,

Here are the wiring diagrams for the transmission which show the power and grounds for the system. Do you have any trouble codes? Here is a guide to help gather any that are stored:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

I have seen the electrohydraulic unit on the side of the transmission go bad FYI. Check out the images (below). Let us know how it goes.

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Thursday, March 27th, 2025 AT 10:11 AM
Tiny
ANDRIN ATEM
  • MEMBER
  • 397 POSTS
I got some. Does from the car, I will update share so you can take a look and advise.
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Tuesday, April 1st, 2025 AT 3:53 PM
Tiny
ANDRIN ATEM
  • MEMBER
  • 397 POSTS
What ever info I might need relating to gear shifting, please help provide.

Thanks Ken.
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Wednesday, April 2nd, 2025 AT 7:57 AM
Tiny
KEN L
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I am sorry Andrin, the text is too small to read, can you please reload larger images?
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Wednesday, April 2nd, 2025 AT 10:59 AM
Tiny
ANDRIN ATEM
  • MEMBER
  • 397 POSTS
Okay, let me do so.
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Wednesday, April 2nd, 2025 AT 11:38 AM
Tiny
ANDRIN ATEM
  • MEMBER
  • 397 POSTS
I hope this helps.
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Wednesday, April 2nd, 2025 AT 11:44 AM
Tiny
KEN L
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That is a lot of codes! I have seen the IPM cause this issue. I would swap it out and then clear the codes to see if it fixes it. Disconnect the battery first, the IPM does not need programming, you might want to try to find a used one on eBay. Check out the images (below). Let us know how it goes.
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Thursday, April 3rd, 2025 AT 9:12 AM
Tiny
ANDRIN ATEM
  • MEMBER
  • 397 POSTS
I agree on this 10000% you are very correct, firstly I will try to repair if not then replace.

Does this IPM got a CPU inside, if it’s a module then it has.
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Thursday, April 3rd, 2025 AT 9:44 AM
Tiny
ANDRIN ATEM
  • MEMBER
  • 397 POSTS
If you could provide me with more diagrams on this module, I can try my best to fix it before thinking of replacing it. Power ground, network diagram signals.
I can try to make it work, as it stands now D does not engage, not even R.

I also noticed last week a relay to send power to the TCM, after removing the relay with the key on run position, I could not find any power on any pins.
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Thursday, April 3rd, 2025 AT 10:24 AM
Tiny
ANDRIN ATEM
  • MEMBER
  • 397 POSTS
From the scan module chat, I can see it on the network system. Meaning it does not uses can bus high and low.
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Thursday, April 3rd, 2025 AT 10:39 AM
Tiny
KEN L
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Yes the IPM is a module with various tasks. Here are the power inputs and outputs so you can make sure it is getting power. Check out the images (below). Let us know how it goes.
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Friday, April 4th, 2025 AT 9:36 AM
Tiny
ANDRIN ATEM
  • MEMBER
  • 397 POSTS
Thank you very much.
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Friday, April 4th, 2025 AT 9:45 AM
Tiny
ANDRIN ATEM
  • MEMBER
  • 397 POSTS
Hi Ken, after a closer inspection, I can bet this problem is caused by ABS module not showing on the network, because the gear shifter module and the transmission module both complain of losing communication with the ABS, when scanning, the ABS does not appear.
So, I would like to get the high can and low can diagrams power and grounding for the ABS unit. What voltages am I to find on the high can and low can?
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Saturday, April 12th, 2025 AT 3:23 AM
Tiny
ANDRIN ATEM
  • MEMBER
  • 397 POSTS
Take a look at this chat. Notice the ABS is not onboard, and the electronic shift gear is reporting one fault. And that is not getting communication with ABS.
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Saturday, April 12th, 2025 AT 3:27 AM
Tiny
KEN L
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Did you check the power outputs from the IPM? See if you have power at these fuses:
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Sunday, April 13th, 2025 AT 9:48 AM
Tiny
ANDRIN ATEM
  • MEMBER
  • 397 POSTS
I will check this and revert back to you.
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Sunday, April 13th, 2025 AT 10:34 AM
Tiny
KEN L
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Sounds good, if you have no power at fuse f21 then the IPM is bad.
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Monday, April 14th, 2025 AT 9:16 AM
Tiny
ANDRIN ATEM
  • MEMBER
  • 397 POSTS
Okay! Noted.
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Monday, April 14th, 2025 AT 9:29 AM
Tiny
ANDRIN ATEM
  • MEMBER
  • 397 POSTS
This dude right? This should be hot at all times? Key of or key in run position, it should be hot at all times?
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Monday, April 14th, 2025 AT 9:35 AM
Tiny
ANDRIN ATEM
  • MEMBER
  • 397 POSTS
Hi Ken, I checked and noticed it’s hot even when the key is off. Does this mean the IPM is okay? What I am sure is truly the problem why the gears don’t engage and shift on D, it’s the ABS module which is either not on the network or bad. Any method I can use to verify the integrity of the ABS module.
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Monday, April 14th, 2025 AT 10:13 AM

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