2002 Grand Cherokee Transmission Reverse - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Grand Cherokee & Commander Forums > WJ Grand Cherokee Forum > 2002 Grand Cherokee Transmission Reverse

Gear Installs at CCOR SpecialWe have Engo 10k Synthetic IN STOCK!!! Hurry while supplieIron Cross Customer JK and TJ Wrangler Bumpers now at ROCK

Reply
Unread 06-03-2012, 04:59 PM   #1
TestPoint
Registered User
 
Join Date: Jun 2012
Location: Ellijay, GA
Posts: 5
2002 Grand Cherokee Transmission Reverse

I have been invited to assist my grandson diagnose the transmission reverse issue with his newly purchased '02 (140k miles). The previous owner was having reverse problems to the point that he decided to sell an otherwise excellent car. He was the first owner and never had the ATF changed. He had the ATF changed as a result of the issue but that did nothing to affect the failing reverse. It worked fine when first driven, no slipping, acted normal. Shortly it began to fail to engage and now does not engage at all. It is not in reverse and just slipping.

He did buy at a price assuming replacing the trans so we are not real disappointed.

I am familiar with the ZF transmissions of that era and have full documentation on them. I know that the shift lever is a switch operating a solenoid on the bottom of the transmission under control of the Trans Control Module.

What is the probability of repair short of replacing the trans?

No CEL codes but understand that my reader will not read trans codes

Most likely problems in order?

Worth having a dealer read any trans codes?

Which solenoid engages Reverse?

Any links to trans documentation?

Thanks for your help!

TestPoint is offline   Reply With Quote Quick reply to this message
Unread 06-03-2012, 05:29 PM   #2
88yjproject
Registered User
2002 WJ 
 
Join Date: Feb 2010
Location: Wyoming, Michigan, Michigan
Posts: 1,078
Which engine do you have?
__________________
2002 WJ 4.0 3" IRO, ES9000 shocks. Midland CB. 245/75R16 Dunlop M/T.
HydroLocked Offroad
88yjproject is offline   Reply With Quote Quick reply to this message
Unread 06-03-2012, 07:10 PM   #3
TestPoint
Registered User
 
Join Date: Jun 2012
Location: Ellijay, GA
Posts: 5
Sorry, 4.7L V8
TestPoint is offline   Reply With Quote Quick reply to this message
Unread 06-03-2012, 08:50 PM   #4
shockracer
14,000' WJ
 
shockracer's Avatar
2001 WJ 
 
Join Date: Oct 2010
Location: Northern, Colorado
Posts: 1,639
Have you tried going from park to reverse, and/or 1st to reverse? Just seeing if its a linkage problem. Also do you know if it was just a filter change or was it fluid and filter change?
__________________
2001 WJ 60th anniversary edition 4.7 quadra-drive
5" hybrid lift, 265/70/17 Guard Dogs load E, bilsteins 5100's, addco sway bars, JKS front quick disco's, JKS adjustable track bar, KOR durometer track bar bushings, IRO crucial path front L.A.s, 1.25" Spidertrax spacers

Colorado Jeep Club Member #262
shockracer is offline   Reply With Quote Quick reply to this message
Unread 06-03-2012, 09:06 PM   #5
narnwv
Moderator
 
narnwv's Avatar
2000 WJ 
 
Join Date: Sep 2009
Location: Cross Lanes, WV
Posts: 6,239
If it were a sensor, it would throw a "P0700-Generic Transmission code", in which a dealer would have to investigate.

Shift solenoid engages reverse.

I've gotta say that I've never ever seen anyone have trouble with the 545RFE transmission. In stating that, they're pretty cheap to replace, as there's TONS of them from wrecked vehicles (it was used in about 10 different vehicles), so they're everywhere.

After a bit of googling (again, never heard of a problem with this trans) I found this:http://en.allexperts.com/q/Dodge-Rep...ny-reverse.htm It applies to Rams, but it's the same transmission. Since you picked it up cheap, it may be worthwhile to have the dealer look at the software on the Transmission controller.
__________________
~Aaron

narnwv is offline   Reply With Quote Quick reply to this message
Unread 06-03-2012, 10:07 PM   #6
88yjproject
Registered User
2002 WJ 
 
Join Date: Feb 2010
Location: Wyoming, Michigan, Michigan
Posts: 1,078
Also check the filters. A cracked filter could be your problem or a cracked valvebody. Drop the pan and look.
__________________
2002 WJ 4.0 3" IRO, ES9000 shocks. Midland CB. 245/75R16 Dunlop M/T.
HydroLocked Offroad
88yjproject is offline   Reply With Quote Quick reply to this message
Unread 06-04-2012, 01:49 PM   #7
TestPoint
Registered User
 
Join Date: Jun 2012
Location: Ellijay, GA
Posts: 5
Spent an educational morning learning about non functional reverse.

Transmission codes read out as:

P0736 JEEP - Gear Ratio Error In Reverse Gear

Possible causes
- Low transmission fluid level
- Dirty transmission fluid
- Shift solenoids
- Transmission mechanical problems
- Transmission hydraulic control circuit

P1715 PG Assembly Malfunction/SSB Inductive Signature Malfunction

Possible causes ???????

P1790 TP (Mechanical) Circuit Malfunction

Possible causes ???????

Discussion with a Jeep technician resulted in his advice to change the transmission filters . . . and use factory filters. He says that he has seen aftermarket filters come apart.

Since the reverse requires 250 psi pressure vs the 125 of the forward gears that a clogged filter may well be the problem. Suspect that the previous owner's efforts at ATF replacement was done with a 'flush' rather than a drain and replacement of filters.

Found used transmission for $500 with 63k miles. Reman valve body for about $300. Going to go for the filters first.

Additional comments appreciated.

Last edited by TestPoint; 06-04-2012 at 03:05 PM..
TestPoint is offline   Reply With Quote Quick reply to this message
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.
Note: All free e-mails have been banned due to mis-use. (Yahoo, Gmail, Hotmail, etc.)
Don't have a non-free e-mail address? Click here for a solution: Manual Account Creation
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.


Thread Tools


Suggested Threads





Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.