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Service 4WD-Grand Cherokee L Limited

Karmbruster

New member
Bought this beauty back in August. Had to take it in a few times for the recalls. Once for a software update for the transmission. Shut off on me at a stop light and automatically kicked on the e-brake. Software update worked and haven't had that issue since. Almost at 6700 miles now, and my service 4wd light just came on. Also been having problems downshifting from 5th to 4th gear. Almost as if it's catching the gear then slipping, causing the car to jerk forward. Taking it in Monday. Hoping it's an easy fix, or I'll be looking into lemon law for the 2nd time now. Fingers crossed its something simple. 🤞🏻
 

Sarge

Well-known member
It's a ZF sourced transmission, and they generally make excellent products. My wife's 2008 535xi with 165k on it still shifts like the day it came off the line, with only a few issues along the way (solenoids, cheap), with regular 50k mile fluid changes.

Make sure your dealer is using the newest WL-capable scantool (my dealer just got the new tool today, and it pulled a LOT more codes than they were previously seeing). So ask them about that... maybe it will help with the diagnosis.
 

Deere78

Well-known member
It's a ZF sourced transmission, and they generally make excellent products. My wife's 2008 535xi with 165k on it still shifts like the day it came off the line, with only a few issues along the way (solenoids, cheap), with regular 50k mile fluid changes.

Make sure your dealer is using the newest WL-capable scantool (my dealer just got the new tool today, and it pulled a LOT more codes than they were previously seeing). So ask them about that... maybe it will help with the diagnosis.
Sarge from what I’ve read Stellantis is making the transmission themselves. They were given a license to build them in house. So we all know what happens when that stuff takes place. Corners get cut.
 

Sarge

Well-known member
Oof. I did not know that. It looks like you're right. It's built in Indiana under license from ZF (same transmission is in the current WL)

TORQUEFLITE 8 (8HP70) SPECS​

Transmission:
Chrysler TorqueFlite 8 (ZF 8HP70)
Type:
8 speed automatic double overdrive transmission
Manufacturer:
Manufactured by FCA under license from ZF Friedrichshafen AG
Production Plant:
Kokomo Transmission Plant, Kokomo, Indiana
Model Years/Applications:
2014 - current Ram 1500 w/ 3.0L EcoDiesel
2014 - current Jeep Grand Cherokee w/ 3.0L EcoDiesel
Case Material:
Aluminum
Max Input Torque:
516 lb-ft/700 N-m max engine torque, 561 lb-ft/760 N-m max input torque
Max Input Speed:
5,500 rpm
Max GCWR:
16,000 lbs
Weight:
~ 207 lbs (2wd model w/ fluid)
ATF Type/Spec:
ZF 8 & 9 Speed ATF automatic transmission fluid, MOPAR 68218925AA
Transmission Filter P/N:
MOPAR 68225344AA (includes hardware, gasket, new pan/filter assembly)
Features:
• Shift-by-wire system; no shift cables, gears are selected electronically.
• Downshifts can occur from 8th to 2nd under appropriate conditions, allowing on-demand power as necessary
• Torque converter lockup available in all 8 forward gears
• Gear shifts transpire in 200 ms or less
• 8HP70 - 8 forward speeds, hydraulic transmission, planetary gearsets, 700 N-m maximum allowable engine torque
 

Karmbruster

New member
It's a ZF sourced transmission, and they generally make excellent products. My wife's 2008 535xi with 165k on it still shifts like the day it came off the line, with only a few issues along the way (solenoids, cheap), with regular 50k mile fluid changes.

Make sure your dealer is using the newest WL-capable scantool (my dealer just got the new tool today, and it pulled a LOT more codes than they were previously seeing). So ask them about that... maybe it will help with the diagnosis.
Thanks for the heads up! I'll definitely mention it
 

whitetiger981

New member
Bought this beauty back in August. Had to take it in a few times for the recalls. Once for a software update for the transmission. Shut off on me at a stop light and automatically kicked on the e-brake. Software update worked and haven't had that issue since. Almost at 6700 miles now, and my service 4wd light just came on. Also been having problems downshifting from 5th to 4th gear. Almost as if it's catching the gear then slipping, causing the car to jerk forward. Taking it in Monday. Hoping it's an easy fix, or I'll be looking into lemon law for the 2nd time now. Fingers crossed its something simple. 🤞🏻
My service 4wd light just came on today. I just bought it a week ago and it only has 336 miles on it!
 

cmpk13

Member
My service 4wd light cane on about 7 times was only able to get to the dealership 4 times for them to pull the code. Make sure to get to dealership asap every single time or take a pic. Jeep wont recognize this as valid unless a code is actually pulled and dealership opens star and transfer case to check. Ive been denied 5 times w the lemon law. I noticed that when you turn jeep on and off it resets so it’s impossible to fet to the dealership sometimes and if they service it without a code its still not valid. This is how jeep in getting away with it. I had to stop with im doing on my way to work just to drop it off hitch a ride to work from the dealership just to get it probably done.
 

SweetAndLow

Well-known member
My service 4wd light cane on about 7 times was only able to get to the dealership 4 times for them to pull the code. Make sure to get to dealership asap every single time or take a pic. Jeep wont recognize this as valid unless a code is actually pulled and dealership opens star and transfer case to check. Ive been denied 5 times w the lemon law. I noticed that when you turn jeep on and off it resets so it’s impossible to fet to the dealership sometimes and if they service it without a code its still not valid. This is how jeep in getting away with it. I had to stop with im doing on my way to work just to drop it off hitch a ride to work from the dealership just to get it probably done.
It stores the code in memory even if the light goes away. I think you need a new service department.
 

Rollerbones

Well-known member
Mine came on today, I will just add it to the list of things going wrong with this. It actually goes in for service today for the heated steering wheel not working. Over 40 days in service for different items.
My light stays on even if I shut it off and restart.
1


66419701082__AA9D2C1A-BF19-442E-8BE9-BF013546D941.jpeg
 

Karmbruster

New member
It stores the code in memory even if the light goes away. I think you need a new service department.
My service department told me the same thing. That they couldn't pull the code, and I'd have to bring it in as soon as the code comes on. Claimed they had no problem with my trans either.
 

Karmbruster

New member
My service 4wd light cane on about 7 times was only able to get to the dealership 4 times for them to pull the code. Make sure to get to dealership asap every single time or take a pic. Jeep wont recognize this as valid unless a code is actually pulled and dealership opens star and transfer case to check. Ive been denied 5 times w the lemon law. I noticed that when you turn jeep on and off it resets so it’s impossible to fet to the dealership sometimes and if they service it without a code its still not valid. This is how jeep in getting away with it. I had to stop with im doing on my way to work just to drop it off hitch a ride to work from the dealership just to get it probably done.
My service department told me the same thing. That they couldn't pull the code, and I'd have to bring it in as soon as the code comes on. Claimed they had no problem with my trans either.
 

udithaky

Active member
When the Service 4WD light is on, does the 4WD still work? Has anyone tried it? I got the light before a snow storm and had to come home early from a planned trip since I didn't want to take the risk of 4wd not working on a rural country road. However, the light cleared on my way home and I was really pissed off about the whole thing.
 

FlyingAvocado

Well-known member
After seeing the photo Rollerbones posted, as a software engineer I feel the need to rant.

If by chance a Jeep Product manager or Software Engineer working on the driverside display should read through this... if there is one take away it should be this:

You already know A full LCD display does SOOOO much more than an analog display - so why does it replicate an analog indicator light from the 1980s? I truly feel terrible for the service technicians which have to figure out what "SERV 4WD" actually means and has to try to explain it to a rightfully angry owner. Jeep ought to treat this indicator like a systems log for a complex distributed system (because that is exactly what vehicles have become) which you personally will have to debug at 3AM. Complex systems _will fail_. What you put into and error message will make a HUGE difference in the time it takes to recover from the issue. With that in mind, for the love of god, PLEASE output a more useful and helpful error message!

Using the pretty LCD in these vehicles to output a detailed and meaningful message which actually tells us the detected problem would be wonderful. Even if customers don't know exactly what the error means, it would enable service technicians at dealerships to improve their service turnaround by helping the customer give the technician a useful and detailed status message from the moment we bring the vehicle in. No need to spend more time to connect an external computer or tablet to decode it - just show it right there, hell give the tech a QR code on the display to direct them to all the documentation they need even - there are so many better ways to do this. It will make us customers FAAAAAR more happy to see an message which helps us understand the problem, and tell the service technicians with detail about than having to just say, "My 'SERV 4WD' "light" came on."

Code:
----------
|  SERV  |
| ERRMSG |
----------

(Yeah, it shouldn't happen on a new vehicle either... but this specific detail about the whole thing is a pet-peeve of mine.)

</end-rant>
 

Deere78

Well-known member
After seeing the photo Rollerbones posted, as a software engineer I feel the need to rant.

If by chance a Jeep Product manager or Software Engineer working on the driverside display should read through this... if there is one take away it should be this:

You already know A full LCD display does SOOOO much more than an analog display - so why does it replicate an analog indicator light from the 1980s? I truly feel terrible for the service technicians which have to figure out what "SERV 4WD" actually means and has to try to explain it to a rightfully angry owner. Jeep ought to treat this indicator like a systems log for a complex distributed system (because that is exactly what vehicles have become) which you personally will have to debug at 3AM. Complex systems _will fail_. What you put into and error message will make a HUGE difference in the time it takes to recover from the issue. With that in mind, for the love of god, PLEASE output a more useful and helpful error message!

Using the pretty LCD in these vehicles to output a detailed and meaningful message which actually tells us the detected problem would be wonderful. Even if customers don't know exactly what the error means, it would enable service technicians at dealerships to improve their service turnaround by helping the customer give the technician a useful and detailed status message from the moment we bring the vehicle in. No need to spend more time to connect an external computer or tablet to decode it - just show it right there, hell give the tech a QR code on the display to direct them to all the documentation they need even - there are so many better ways to do this. It will make us customers FAAAAAR more happy to see an message which helps us understand the problem, and tell the service technicians with detail about than having to just say, "My 'SERV 4WD' "light" came on."

Code:
----------
|  SERV  |
| ERRMSG |
----------

(Yeah, it shouldn't happen on a new vehicle either... but this specific detail about the whole thing is a pet-peeve of mine.)

</end-rant>
But if they made it easier to diagnose then they wouldn’t be able to charge astronomical amounts of money to diagnose the problem. Unfortunately auto manufacturers are in the busy to make money these days. They don’t seem to want the car to last too long. That would cut into new car sales. They want the vehicle built in such a way the owner needs to bring it back to the dealer for service vs a diy or small shop servicing it. It’s a racket that we the customers are trapped in.
 

FlyingAvocado

Well-known member
But if they made it easier to diagnose then they wouldn’t be able to charge astronomical amounts of money to diagnose the problem. Unfortunately auto manufacturers are in the busy to make money these days. They don’t seem to want the car to last too long. That would cut into new car sales. They want the vehicle built in such a way the owner needs to bring it back to the dealer for service vs a diy or small shop servicing it. It’s a racket that we the customers are trapped in.
I don't believe we are trapped in anything personally. We can choose to continue being a customer or not at any time.

The automotive industry is at an inflection point, where customer satisfaction and brand loyalty is absolutely essential to their continued success. A LOT of new manufacturers are entering the market, and poor customer experience will drive churn which they cannot afford. This is the begining of what can be best described as the iPhone moment for this industry. Before the iPhone Apple had a piss poor market share, now they dominate the entire industry. Any automotive manufacturer which fails to recognize this inflection is doomed to failure. However, I think that I think they do recognize it - and now it's down to execution. My little rant highlights an execution failure which needs to be fixed. I remain hopeful it will, but I realize the cultural change is painful and will take some time - and from time to time, a little push in the right direction from their customers.
 

Fdot

Member
my car has been having intermittent service 4wd since I got it in September 21. Brought it to dealer for 10k service. Told me I need a transfer case.
 

udithaky

Active member
my car has been having intermittent service 4wd since I got it in September 21. Brought it to dealer for 10k service. Told me I need a transfer case.
When you brought it in, did it still have the 4WD light on? I got this light a few times as well but it always goes away within a day and before I can take it in for a scan. I had the dealership scan after the light had gone out but they did not see any codes.
 
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