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Rubigoddess 03-07-2008 07:43 PM

TJ Error Codes
So, I learned something new today. My check engine light has been coming on periodically. I found out that if you cycle the key (turn to accessory mode) two times quickly, then the third time leave it on, an error code will pop up. This code will tell you what the problem is. I checked out this site
and it told me what my "P0123" code meant.

It means
P0123 (M) Accelerator Position Sensor (APPS) Signal Voltage Too High APPS voltage input above the maximum acceptable voltage.

Now, what does that REALLY mean and how do I fix it?

mr4x4 03-07-2008 08:00 PM

I tried to get that stickied about a year ago it didn't happen

4point 03-07-2008 08:06 PM

That would be the TPS Throttle Position Sensor. It s very inexpensive and easy to replace. Its on the side of the throttle body and is held on by 2 screws and the electrical connector.

Smeghead 03-07-2008 08:25 PM

By wiggling the ignition key on and off like that wouldnt you expect some kind of voltage spike error?

Triple88a 03-07-2008 09:17 PM

From another thread... TPS.. throttle position sensor


Originally Posted by 4.0l sahara (Post 199871)
It's iac not ias. There is no idle air sensor. It stands for idle air controller.

First make sure the wire connector is all the way in. Pull it off, clean the inside and plug it back in.. If no luck, go to your junkyard and get a new TPS (only TPS)... very easy.. bolt on bolt off bolt on procedure with a little wiggle.

Rubigoddess 03-08-2008 01:50 AM

Huh, thanks for all the input.......whose flying out here to do me..........errrr, I mean work on the heep for me?

Triple88a 03-08-2008 02:09 AM


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