Go Back   Jeep Garage - Jeep Forum > Jeep Platform Discussion > Grand Cherokee - WK > Troubleshooting/Problems

Join Jeep Garage Today
Reply
 
Thread Tools Display Modes
 
  #1  
Old 10-02-2011, 12:10 AM
Blueflame1979's Avatar
Member
 
Join Date: May 2011
Posts: 118
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 1427
Blueflame1979 is on a distinguished road
How serious is this?

So the other day I was driving and the check engine light and service electrical brake system came on at the same time. I did the key dance and the code P0068 came out on the DTC report. Now, I looked up the code on the net and it states it could be a number of things, from throttle sensor to a vacuM leak, So it's a little hard to actually pinpoint the problem since Im not a Mechanic.

I think it might have to do with the rough idle I have been experiencing eversince I bought My Jeep, which is used by the way. The day before the check engine light came on I was slowly pumping the brakes coming to a full stop. In between times it felt like my car wanted to take off and it was revving somewhat, but I only had my foot on the brakes and not the gas pedal. Them it stalled on me.I didn't think anything of it since my cars been stalling here and there but I can usually start it no problem and the service electrical brake system comes on from time to time the dissapears.

Today I drove the Jeep to work, 4 miles all together, and there were no check engine light or service electrical brake system, but the code p0068 still came up. I felt the car driving fine for the moment, but my real question is, can I drive my car to work everyday(4 miles) until about 12 days from today, ( because that's when I get paid, so I can take it to a mechanic) without having to worry that Im doing damage to my Jeep? Thanx alot for ur help.
__________________

__________________
2005 Jeep Grand Cherokee Lauredo
4.7 L V8 Monster under the Hood... At least that's what it sounds like.
Close to 68k, so she's an experienced Virgin.. I think..
No Mods yet, IDK where I stand, but I like *O* Big Shiny Wheels *O*
Now, what the hell was I sayin??
Reply With Quote
  #2  
Old 10-02-2011, 12:36 AM
SvenskaJeepGuy's Avatar
Let's Roll
My Jeep: 2005 4.7L WK
 
Join Date: Dec 2009
Location: Scranton PA
Posts: 13,091
Thanks: 140
Thanked 163 Times in 153 Posts
Rep Power: 1255478
SvenskaJeepGuy has a reputation beyond reputeSvenskaJeepGuy has a reputation beyond reputeSvenskaJeepGuy has a reputation beyond reputeSvenskaJeepGuy has a reputation beyond reputeSvenskaJeepGuy has a reputation beyond reputeSvenskaJeepGuy has a reputation beyond reputeSvenskaJeepGuy has a reputation beyond reputeSvenskaJeepGuy has a reputation beyond reputeSvenskaJeepGuy has a reputation beyond reputeSvenskaJeepGuy has a reputation beyond reputeSvenskaJeepGuy has a reputation beyond repute
Garage
Re: How serious is this?

i am pretty sure if it was a vaccum leak then your air would be blowing out of your defroster only....... at least that happened on my WJ when i had the leak.
__________________

__________________
Reply With Quote
  #3  
Old 10-02-2011, 04:59 PM
Blueflame1979's Avatar
Member
 
Join Date: May 2011
Posts: 118
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 1427
Blueflame1979 is on a distinguished road
Re: How serious is this?

Lets say it were a Vacuum leak, because the symptoms I looked up on the Internet fit the description, would ir be ok to drive my car until the end of the week?
__________________
2005 Jeep Grand Cherokee Lauredo
4.7 L V8 Monster under the Hood... At least that's what it sounds like.
Close to 68k, so she's an experienced Virgin.. I think..
No Mods yet, IDK where I stand, but I like *O* Big Shiny Wheels *O*
Now, what the hell was I sayin??
Reply With Quote
  #4  
Old 07-12-2012, 01:57 PM
Member
My Jeep: 2011 3.6L WK2
 
Join Date: Jul 2012
Location: Ontario
Posts: 45
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 950
theyoungjeepguy is on a distinguished road
Re: How serious is this?

Okay so, P0068 is "Manifold Pressure/Throttle Position Correlation.

This DTC is set when there is an unexpected high intake manifold air flow condition that exists. This can lead to increased engine speed and this puts the NGC (next generation controller) into the high air flow protection limiting mode. the high air flow protection feature does include an RPM limit for when that throttle and/ or the MAP sensor limp-in fault becomes present.

This DTC is usually set when the vacuum drops below 1.5''Hg or 50mBar with the engines RPM is greater than 2000 RPM and your throttle is closed. it is usually due to the TPS or MAP sensor failure.

There are numerous causes.

Vacuum Leak, Restricted Intake Air System, and certain resistances in the 5-volt supplies, included it becoming shorted, tps, map sensor, and lastly, the PCM.
__________________
Reply With Quote
  #5  
Old 07-14-2012, 03:53 PM
Member
My Jeep: 2007 3.7L WK
 
Join Date: May 2012
Location: St.Louis, MO
Posts: 107
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 1070
NightFury is on a distinguished road
Re: How serious is this?

Check the vacuum hose from the intake manifold to the brake booster.
__________________
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 07:36 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Copyright 2012 - JeepGarage.Org
The Jeep Grand Cherokee Owners Community

JeepGarage.org is in no way associated with or endorsed by Chrysler Group LLC.