05 Jeep GC 3.7 tranny issues or wiring. - JeepForum.com
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post #1 of 17 Old 03-07-2019, 06:33 AM Thread Starter
Onbeat1
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05 Jeep GC 3.7 tranny issues or wiring.

Hello guys, I got a 2005 Jeep grand Cherokee 3.7 L with 220,000 miles. For the past couple months it has been stuck in third gear and I’ve noticed I can shift it without pushing my brake pedal in and I change my brake light sensor. The last time I had a code checked it was saying something about a stuck A solenoid. And I’ve also changed the transmission speed sensor several times and nothing has worked I change the fluid and nothing I’m at a loss and stuck between a bad wiring issue or bad solenoids. Any help would be appreciated thank you

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post #2 of 17 Old 03-07-2019, 07:21 AM
jtec
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Step 1 -
Use a scanner to access ALL codes, post them here someone will advise how to proceed.

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #3 of 17 Old 03-08-2019, 12:49 PM Thread Starter
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I did.. it said I had a stuck A solenoid
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post #4 of 17 Old 03-08-2019, 02:17 PM
jtec
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could you SHARE the codes?

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #5 of 17 Old 03-09-2019, 05:48 AM
Nejeep
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Try cleaning or changing the solenoids and conductor plate inside the valve body. Since this trans is used in lots of vehicles there are several Youtube videos on this process. Here is one:

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post #6 of 17 Old 03-09-2019, 06:33 PM Thread Starter
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Here are my error codes as of right now.

P0752 - shift solenoid A stuck on.
P0753 - shift solenoid A electrical.
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post #7 of 17 Old 03-10-2019, 09:23 AM
jtec
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can you confirm this is a NAG1 trans- we are assuming* so checking is advised.

p0753 is a circuit issue I would start there


*based on spec sheets
Attached Files
File Type: pdf p0753.pdf (179.5 KB, 8 views)

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #8 of 17 Old 03-10-2019, 07:34 PM Thread Starter
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Quote:
Originally Posted by jtec View Post
can you confirm this is a NAG1 trans- we are assuming* so checking is advised.

p0753 is a circuit issue I would start there


*based on spec sheets





Yes, I already confirmed this with the dealer and I’ve already swapped out the speed sensor 4 times (the conductor plate) 3 of which were used. Two worked for a rough 2-3 months then quit. So I bought the 4th and final one from AutoZone for 260$ It didn’t even attempt to work. That threw me off by a mile. Which brings me here.
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post #9 of 17 Old 03-11-2019, 06:38 AM
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I would recommend carefully inspecting the transmission wiring and connectors for damage or corrosion. The wiring diagram provided by jtec should be helpful.

Do the transmission solenoids check out for resistance (ohms) and move when energized with 12 volts? I have seen the resistance specs somewhere so you should be able to search for them.
Edit: The resistance specs are included on the jtec diagram.

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post #10 of 17 Old 03-12-2019, 08:36 AM Thread Starter
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Quote:
Originally Posted by Nejeep View Post
I would recommend carefully inspecting the transmission wiring and connectors for damage or corrosion. The wiring diagram provided by jtec should be helpful.

Do the transmission solenoids check out for resistance (ohms) and move when energized with 12 volts? I have seen the resistance specs somewhere so you should be able to search for them.
Edit: The resistance specs are included on the jtec diagram.


Okay, I’m going to be doing my solenoid checks friday as the weather warms up.
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post #11 of 17 Old 03-12-2019, 08:59 AM
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Quote:
Originally Posted by jtec View Post
can you confirm this is a NAG1 trans- we are assuming* so checking is advised.

p0753 is a circuit issue I would start there


*based on spec sheets
FWIW, the 3.7l ONLY came paired with the NAG1 transmission.

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post #12 of 17 Old 03-12-2019, 09:06 AM
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that is what the specs say, a confirmation is always suggested- gone down the wrong rabbit whole and learned. *** U ME

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #13 of 17 Old 03-30-2019, 11:18 AM Thread Starter
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Help fellas, changed my Speed sensor and still nothing good. Changed the solenoids and still the Jeep is in limp mode. I’m literally lost as to what this thing issue is.
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post #14 of 17 Old 03-30-2019, 12:34 PM
jtec
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WHY are you spending money?

Did you even read the attachment I added - do any of the tests?

Is it above comfort level to check wiring?
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When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #15 of 17 Old 03-31-2019, 11:29 AM Thread Starter
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Originally Posted by jtec View Post
WHY are you spending money? <img src="https://www.jeepforum.com/ubb/confused.gif" border="0" alt="" title="Confused" class="inlineimg" />

Did you even read the attachment I added - do any of the tests?

Is it above comfort level to check wiring?


I’ve had this part for a little while. The weather hasn’t permitted changing this part. I’m going to be doing wire test. My solenoids also got replaced. So my assumption is, there’s a wire issue or a PCM issue.
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