2005 WK 3.7 Errors 1672, 0404, and P0710 - JeepForum.com
 
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post #1 of 5 Old 02-01-2016, 07:36 AM Thread Starter
gelaro
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2005 WK 
 
Join Date: Jan 2009
Location: Michigan
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2005 WK 3.7 Errors 1672, 0404, and P0710

Short leadin: A while back I had some transmission codes, hard shifting, not shifting, etc. The dealer said replace TCM for $900. I replaced the wheel bearing due to ABS error and codes went away.

Last week, CEL light came on and trans started shifting hard, all four light (PRND) would be boxed at the same time. Wouldn't shift out of first. When I went from P to N for a second, then it would run fine. Same pattern several times.

I took it to trans shop who said it gave errors codes 1672, 0404, and P0710. The 0404 says it is related to the EGR valve. Chrysler says there is no EGR valve on this car. The P0710 is supposed to be trans temp related, I believe.

I know the trans needs to be serviced, but I think the TCM is internal and I don't want to service it and then have to go back and replace it, essentially servicing it twice.

So, any ideas on next steps. I was going to replace the EGR valve and see if that fixes it. But apparently I can't do that (which makes me wonder why it gives a code for something that doesn't exist).

BTW, the CEL is now off and everything is running fine. The codes were not reset.

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post #2 of 5 Old 02-01-2016, 09:22 AM
Nejeep
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I think the confusion may be caused by two different code numbers (P0404 and U0404). The P0404 is an EGR code which would not apply to the 3.7 engine as it does not have one. A U0404 is a general transmission code meaning some other transmissions codes are stored.

The TCM is built into the ECM on the WK Jeeps, so it cannot be serviced or replaced separately. There is a separate shift module in the console that can be serviced (cleaned) or replaced if needed. There are several threads here on JF if you need more info on that.

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post #3 of 5 Old 02-01-2016, 11:23 AM Thread Starter
gelaro
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Join Date: Jan 2009
Location: Michigan
Posts: 14
Ah, that makes sense. The trans shop just said 0404 and I assumed it was P. It looks like some have had success dissembling the shifter and cleaning the circuit board wiht contact cleaner so I am going to try that.

Any idea on the P0710 (I know that one is a P code)? It says trans temp related. I assume that is inside the trans as well. Perhaps servicing the trans would help. It's got 100K on it and I don't think it has ever been serviced.

Thanks.
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post #4 of 5 Old 02-01-2016, 12:51 PM
Nejeep
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The P0710 is a transmission temp sensor code which has been reported to pop up with various others, but I would recommend you clean the shifter module first then see if the code returns after that. I cleaned mine several years ago and and no problems since. If that code returns take a look at the electrical connector on the transmission. They sometimes leak and besides loosing ATF, the fluid gets inside the connector and causes strange issues.
A transmission fluid service would also be a good idea if the history is unknown.

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post #5 of 5 Old 02-03-2016, 01:48 PM Thread Starter
gelaro
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2005 WK 
 
Join Date: Jan 2009
Location: Michigan
Posts: 14
I cleaned the shifter module. It had quite a bit of graphite streaks on it. It seems to run fine (but it was running fine again before I cleaned it). I am taking it to get it serviced this week so hopefully that fixes it.

Thanks for the help.
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