Need some help please - Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ Tech Forum

Join Wrangler Forum Today

Thread Tools

Please support our sponsors and let them know you heard about them on
Old 09-15-2010, 07:38 AM   #1
Join Date: Aug 2010
Location: Lancaster Oh
Posts: 19
Need some help please

Hi I have a 2002 tj 4.0 auto. Recently when ever I come to a stop the idle gets funky but just low and it's died a couple of times when it gos crazy the check engine light comes on. So I did the thing to get the codes an it came back with. P0122, P0123, P0455. First two are the throttle position sensor voltage low and high. Does any one know what causes this? And the other is a leak in the evaporate system. I have no clue on that. My jeep has 50 k miles on it. Any help would be greatly appreciated.

Tsisco is offline   Quote
Old 09-15-2010, 08:19 AM   #2

WF Supporting Member
Kauka's Avatar
Join Date: Oct 2008
Location: Ridgecrest, CA
Posts: 251
I've have this same issue, but it only happens to me about once every six months. I have no idea what it is. Ive tried to recreate the problem but can't. Its impossable to trouble shoot when you have no where to look. You may have better luck finding the problem because yours sounds like it happens more.

I know thats not really any help in solving the problem, but at least you know your not alone

Plus just to give someone more infomation that might have an idea as to what it is. I have an 04 Rubi, 63k it happens to be when I come to a stop (ie: stoplight or sign) it idles real rough, rpm drops, it has died and I've kept it running buy playing with the pedal. Happens quick and is over quick, if it dies it does start up again with no problem.


1" motor & body lift. BDS 2" Suspension lift, BDS 5500 Series Shocks, ZJ tie rod conversion, LED Dash Lights MOD
Kauka is offline   Quote
Old 09-15-2010, 10:23 AM   #3
Join Date: Aug 2010
Location: Lancaster Oh
Posts: 19
Yeah that's exactly what mine does. Some one told me that the sensor is going bad. That detects your idle. I dunno
Tsisco is offline   Quote
Old 09-15-2010, 08:14 PM   #4
Join Date: Oct 2009
Location: San Jose Calif.
Posts: 1,006
As far as the evap code goes I had the same problem a while back. Check the gas cap and make sure it's on tight. My cause turned out to be a little (green on mine) screw on cap up between the throttle body and the brake fluid reservoir. Tightened that (hand tight) and it solved the problem
03 RUBI is offline   Quote
Old 09-15-2010, 09:36 PM   #5
Join Date: Aug 2010
Location: Lancaster Oh
Posts: 19
Ok I'll look into that rubi thank you
Tsisco is offline   Quote
Old 09-23-2010, 03:35 PM   #6
Join Date: Sep 2010
Posts: 1
I just had the same problem with the throttle postion sensor. Took the jeep to Checker Auto Parts, bought the sensor ($35), and the manager put it on for me right in the parking lot of the store in about 5 minutes. Just has one electrical connection and 2 allen screws (on my 2002 wrangler sport, 4.0L). Hope it helps.
hetiv is offline   Quote
Old 09-23-2010, 04:55 PM   #7
Join Date: Sep 2010
Location: Roanoke, Tx
Posts: 37
I agree. Replace the TPS. Won't take you but a second to do it.

On a similar note on my Land Rover it required a reset with testbook (dealer software) to get the ECU to correctly read the new TPS and IACV. Does that apply to our Jeeps as well? Does the ECU need to be reset? I ask this here not to hi-jack but because it is applicable if he replaces his TPS.

Brandon Sutter EMT-P

2002 Jeep Wrangler, 65,000 miles, 2" Pro-Comp Lift, 31" All-Terrains, aftermarket front and rear bumpers, tuffy overhead radio lockbox
jeepmedic4 is offline   Quote

Thread Tools

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

Download our Mobile App

» Featured Product

All times are GMT -5. The time now is 12:15 PM.

User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2015 DragonByte Technologies Ltd.

Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC. is not in any way associated with the Chrysler Motors LLC