HELP! Getting transmission codes in my Grand Cherokee -
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Unread 11-06-2007, 11:00 AM   #1
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Join Date: Nov 2007
Location: GA
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HELP! Getting transmission codes in my Grand Cherokee

This is my first post for my first Grand Cherokee.

I have a 2002 Overland Edition with about 88,000 miles. I am having tranny problems as of yesterday. The Check engine light came on and a code (P0740 Torque Converter clutch circuit malfunction) came up. I reset the code and planned on changing the fluid and filter today to see if it would help. Today on the way home, it locked in 2nd gear for a while and would not shift, and the high speed fan came on. I checked the codes again, and got the same P0740 along with a P0218 (High Temp Operation Activated) and another one that said 49 (See Service Manual). I assume the service manual on has to do with the SPX brand scanner I am using, but I do not have the manual.

My question is, should I waste my time changing the fluid and filter, or try to take it in to see if my extended warranty will cover it (mainly anything internally that touched oil?)

I am planning on going out of town tomorrow,and would really like to know if I could get this taken care of (either fixed or dropped off at the dealer) before I go.

Please help a new Jeep owner. Thanks in advance!

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Unread 11-06-2007, 11:14 PM   #2
scott 035
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1998 TJ Wrangler 
Join Date: Oct 2007
Location: Michigan
Posts: 30

Personaly if you have a warranty start at the dealer. As soon as you touch it that gives them a reason not to cover it. Don't even let them know you have a scanner!
And whatever you do DON'T clear the codes untill it is repaired ! When codes are cleared it also clears what is known as a movie that the PCM or the TCM or the BCM store when a code set's.This move also aids in a quicker repair which means a slightly smaller labor bill.
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Unread 01-14-2008, 01:00 PM   #3
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Can you please let us know what fixed it?

Hi, regarding your post 2 months ago about your ZJ code p0740, did you find out what it was? Mine doing EXACT same thing and I need to back up what my mechanic is telling me.

On mine, I am being told that the Torque Converter went bad (causing code p0740, which detects TC lockup based on RPM/speed differential) which then caused debris to plug the Tranny Cooler causing it to heat up (causing same as your second code), and also causing the tranny to enter limp mode where it won't shift into overdrive (your third symptom). Perfect match to your symptoms.

My mechanic is hinting that I need a tranny rebuild because of the debris (almost $2,000), but I am finding it hard to believe since it drives so well otherwise.

My thoughts were that it's just a solenoid, that the overheating part isn't enough to outright pronounce that there's debis throughout the tranny and it needs a rebuild.

Besides, the torque converter itself didn't blow out, just the clutch portion (drives perfectly otherwise except no lockie on the TC on the highway) so at worst there's clutch material blocking my tranny cooler and that material isn't likely enough to require a tranny rebuild, right?

Any pros out there with some advice for me? Any chance the original poster will see this and let me know what their problem was?

Thanks everyone...
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Unread 09-24-2012, 01:12 PM   #4
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2006 TJ Wrangler 
Join Date: May 2011
Location: Fort Worth, Tx
Posts: 33
Ok I have had the same problem (look at my post code p0218 trans over temp). I had the trans rebuilt and so on. Jeep is still doing the same thing. I have spent about $2700 in this week alone. Dealer can't seem to find the problem. Not sure what to so next other then a little C4.
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