P0700 and P0740

[ThomasFletch]

Hello All,

My 2006 SE started throwing codes P0700 and P0740. From the research I did on the forum, It was most likely the transmission fluid. I changed the fluid with ATF+4 and the codes still came up after a short drive in the mountains. I also saw that it could possibly be the torque convertor or PCM, but I have not had any strange transmission shifts and I just recently switched my PCM for the one by WranglerFix. I also understand that it could be the torque convertor solenoid as well, but I can't seem to find the part anywhere and am not quite sure where it is even located on the Jeep.

 

[LONGJP2]

Once I started getting those codes, things got worse and worse. Codes, transmission running hot, converter chatter, limp mode. I went ahead and had mine rebuilt. Didn't fix the hard 1/2 shift. Need a (Wfix) PCM for that.

 

[ThomasFletch]

How long did it take from getting the codes to it getting worse?

 

[CharlesHS]

Check the simple things first...
Disconnect the (4) ECM 32 pin harness connectors, ensure the connections have no oxidation on them; then firmly snap the harness connectors into the ECM receptacles.

 

[Goatman]

Did you change out the filter and do a complete flush or just change out what came out when you pulled off the pan? What was the sediment in the bottom of the pan look like? Metallic? Smooth slurry? Bits and pieces? It can tell you a lot about what is going on in the trans.
The #1 enemy of an auto trans is heat. Was there any sign of that in the old fluid? The #2 enemy of a trans is my ex-wife. Any sign of her around? Loud and shrill noises coming from the pass seat? Cold dagger like stares? Loud slamming doors? Etc.?

 

[CharlesHS]

The #2 enemy of a trans is my ex-wife. Any sign of her around? Loud and shrill noises coming from the pass seat? Cold dagger like stares? Loud slamming doors? Etc.?

Now that's FUNNY.....
Sounds similar to my EX....
They must have gone to the same female training school ....

 

[ThomasFletch]

Check the simple things first...
Disconnect the (4) ECM 32 pin harness connectors, ensure the connections have no oxidation on them; then firmly snap the harness connectors into the ECM receptacles.

Is the ECM the same thing as the PCM? The four connecters on the WranglerFix computer?

Did you change out the filter and do a complete flush or just change out what came out when you pulled off the pan? What was the sediment in the bottom of the pan look like? Metallic? Smooth slurry? Bits and pieces? It can tell you a lot about what is going on in the trans.
The #1 enemy of an auto trans is heat. Was there any sign of that in the old fluid? The #2 enemy of a trans is my ex-wife. Any sign of her around? Loud and shrill noises coming from the pass seat? Cold dagger like stares? Loud slamming doors? Etc.?

I didn't do a full flush, when I pulled the pan it looked relatively clean, a dark red color and there was no goo or metal shavings at all. I was planning to flush it, but the fact it looked normal stopped me in hopes of being able to return the extra. (wishful thinking) As for your ex wife, If she's been here she's been on her best behavior! No loud sounds, or high pitched noises that I've noticed. The only dagger like stares I've got have been from my wallet from all the things I've been getting to fix this stuff. The only thing I really have noticed is a slight grinding (?) Sound from under the drivers footwell every so often, usually when giving it a ton of gas like getting on the freeway and such.

 

[LONGJP2]

How long did it take from getting the codes to it getting worse?

Maybe 9 months or so. Mine is not a daily driver, but I do wheel it.

I could tell it was slipping based on higher than normal RPM, and my trans.temp.gauge told me it was running hot.

 

[redneckpunk]

Is the ECM the same thing as the PCM? The four connectors on the WranglerFix computer?

I didn't do a full flush, when I pulled the pan it looked relatively clean, a dark red color and there was no goo or metal shavings at all. I was planning to flush it, but the fact it looked normal stopped me in hopes of being able to return the extra. (wishful thinking)

Did you replace the filter while you were there. Most of my fluid looked good (a little darker near the bottom), but the stuff in the filter looked like really strong coffee. But my Jeep sat for a few years, so a lot of stuff settled to the bottom.

 

[CharlesHS]

The ECM is the computer attached to the firewall on the passenger side above the battery.

 

[ThomasFletch]

Did you replace the filter while you were there. Most of my fluid looked good (a little darker near the bottom), but the stuff in the filter looked like really strong coffee. But my Jeep sat for a few years, so a lot of stuff settled to the bottom.

I did replace the filter, and like yours it was really dark like coffee.

The ECM is the computer attached to the firewall on the passenger side above the battery.

Ok, thank you for the clarification. I will double check the connections to make sure they're clean.

 

[Roadrash74]

Did you change out the filter and do a complete flush or just change out what came out when you pulled off the pan? What was the sediment in the bottom of the pan look like? Metallic? Smooth slurry? Bits and pieces? It can tell you a lot about what is going on in the trans.
The #1 enemy of an auto trans is heat. Was there any sign of that in the old fluid? The #2 enemy of a trans is my ex-wife. Any sign of her around? Loud and shrill noises coming from the pass seat? Cold dagger like stares? Loud slamming doors? Etc.?

I have a manual transmission but am still experiencing the #2 enemy of a trans. Any advice on how to fix/remove it without costing a fortune???

 

[ThomasFletch]

The ECM is the computer attached to the firewall on the passenger side above the battery.

I did replace the filter, and like yours it was really dark like coffee.

Ok, thank you for the clarification. I will double check the connections to make sure they're clean.

I just got back from my test drive up the in the local mountains after checking the ECM connections, and after about 20 miles I got both codes back. :/

 

[ThomasFletch]

Update:

I just got home from work today, which consisted of freeway driving an a few side streets and the CEL turned itself off. If I had to guess a reason, it would be that the torque converter got confused when I was doing my mountain test drives. Maybe because of the extra strain on the trans that it's not used to having as my DD? For reference, the incline going up the mountain varies from 6-8%. I ran my OBDII scanner when I got home, and the codes are technically still there, they are just not illuminating the CEL.

 

[LONGJP2]

When my codes were intermittent, they almost always showed up when I was on a highway incline.

 

[ThomasFletch]

When my codes were intermittent, they almost always showed up when I was on a highway incline.

Aww! Just when I was getting my hopes up of it just fixing itself! Nothing is ever that easy is it? lol I'll definitely keep my eye on it in that case then.

 

[ThomasFletch]

When my codes were intermittent, they almost always showed up when I was on a highway incline.

Once I started getting those codes, things got worse and worse. Codes, transmission running hot, converter chatter, limp mode. I went ahead and had mine rebuilt. Didn't fix the hard 1/2 shift. Need a (Wfix) PCM for that.

Also, were the codes intermittent before or after things got worse?

 

[ThomasFletch]

Update:

So the problem was indeed my transmission needing to be rebuilt. My OD CVI was reading 130, and my torque convertor was going out as well.

 

[Modoc Guy]

Update:

So the problem was indeed my transmission needing to be rebuilt. My OD CVI was reading 130, and my torque convertor was going out as well.

If you don’t mind me asking, how much is the rebuild going to cost?

And are you doing any of the work, or is the shop doing it all?

Curious because I have an old automatic in my rig too.

 

[ThomasFletch]

If you don’t mind me asking, how much is the rebuild going to cost?

And are you doing any of the work, or is the shop doing it all?

Curious because I have an old automatic in my rig too.

The rebuild was 2580.21 with tax and labor included. I didn't do the work myself, as I don't really have time to seeing as my Jeep is my DD. For reference, my Trans had about 135K on it, which according to the forum is about the end of the lifespan for the ol' 42RLE. Definitely not the way I wanted to spend 2500 on my Jeep!