Monday, January 21, 2013

Jeep Grand Cherokee Up shift and Downshift issues

Gear Shift issues on 2001 Jeep Grand Cherokee



While accelerating from stand still up a slight incline with little bit or 1/2 throttle, the gear box takes 3 to 4 attempts to change from 2nd gear into 3rd gear. Under hard acceleration or on a level road it shifts fine.



As per my Auto garage repair Experience i will say the issue is related to transmission.

First of all get the transmission fluid level checked and next get gear box checked,.

Also if there is a check engine light coming ON dashboard then get the Engine module scanned to retrieve the OBD codes stored in the Module.


To retrieve OBD error codes stored in engine module there are two ways, one by Scan tool and other Manually.
To retrieve the codes manually try these procedure mentioned below :------

Cycle the key from OFF to ON   3 times ending with it ON and watch the digital odometer display. Don't crank the starter, just OFF to ON. The codes start with a P and have four numbers, there may be more than one code stored or at-least one error code stored. 

Once the error code is retrieved the further diagnosis can be performed as per the error code.

For your more help, i would like to share one of my garage repair experience which was exactly similar to these issue.

The vehicle was 2001 Jeep Grand Cherokee and the issue was gear shift and Error code retrieved was P0138

This error code helped us to pinpoint the problem resolve the issue.


Now what these error code means :---   P0138 is for the front upstream oxygen sensor being shorted to voltage. 
This seems unrelated to a transmission issue.There is no direct connection between both shifting and faulty oxygen sensor  but it's not unheard of for a shorted oxygen sensor to cause shift issues. 

If you see on your vehicle to the right side of the valve body in the transmission is the governor pressure transducer and solenoid, together they are used to control up-shift and downshift timing. 
Now the governor transducer is the part that senses the pressure in the circuit and it shares a ground with the oxygen sensors. 

As per our Auto garage repair experience  in these condition what can happen is an internally shorted oxygen sensor will bleed voltage into the ground circuit and cause the governor transducer signal to be incorrect.Which we have already seen on many other vehicles too causing same types of problem.
So these issue directly got clicked.

So in these condition I recommend first replacing the front upstream oxygen sensor, disconnect the battery to clear the codes and see how it does. 

But in case if that doesn't take care of it  then there are a few other possibilities to be checked. 
It can be a mis-adjusted throttle valve cable, which goes between the throttle body down to the transmission. This plays a huge part in shift timing.

Or it can also be a failed governor transducer or solenoid, the 2-3 shift valve hanging up, or the front clutch could be slipping.Which is also very much noticed on such cases.


Now with these kind of problem the repair cost can be anything between  $10-$300 or under, if it's simply adjusting the cable that would only take a half hour or so.This can be done by yourself. But if it turns out to be a leaking front clutch, which I really don't expect for your description, that would require transmission dis-assembly and overhaul. 

As per my personal knowledge on dealing with car repairs i wouldn't get too worried about that at this point unless it's actually slipping in third gear.


Now regarding parts replacement.If you go for replacing parts then i suggest always go for quality and branded parts instead on local cheap non branded aftermarket parts.

I will never say aftermarket parts are bad parts,but these parts dont last long and there fitting compared to original part is very loose and out of its way.And performance way these parts dont give you 100 % results.So at last anyway you have to go for new branded part and your cost of expense gets more then you thought.


These details will help.
Thanks.





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