Question about 2000 Jeep Grand Cherokee

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My car died a couple of days ago when I was driving. The codes P0505 and P0123 appeared. I replaced the sensors and the car still won't start and P0505 was still showing up

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  • cajunsweety Oct 19, 2008

    my car wouldn't start and it came back code p0505 and they told me it was something to do with the idol control or something like that anyone know what could be wrong?

  • silver leyva
    silver leyva Mar 12, 2009

    My '99 Cherokee Sport has the same issue. I found out that my sister had been driving it for about 3 or 4 days without a gas cap and it stalled and wasn't able to start/stay running. It would start once in a while but would die right after starting. And if I stepped on the gas pedal it would die even faster. Checked for fuel pressure at the releif valve and a few drops cam out and not a squirt. I had codes P0505 - Idle Air Control Motor Circuit, P0122 and P0123 - Trottle Position Sensor Low/High. I replaced the TPS and dropped the tank (it was full) and tested the fuel pump and was ok so I replaced the Fuel Pressure Regulator and pump strainer/screen (they were pretty dirty). What and where is the "Idle Control Motor"? Cant seem to find it or any info in my Haynes manual.

  • yadayada
    yadayada May 11, 2010

    The codes indicate a problem in the circuit, it can be the sensor, the wiring the computer and so on, replacing a sensor without proper testing is like throwing money away.

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The idle air control valve is on the throttle body below the throttle positioning sensor. To test first, use a test light on the connection coming to it with the vehicle running. Rev the motor and each terminal should make the light flash. In this case it is most likely the sensor. If they do not flash it is in the wiring or pcm

Posted on Apr 20, 2009

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My 2000 Jeep Grand Cherokee Laredo 6 cyl started veh it started to shake was able to drive a short distance and turned off and it does not turn on, changed the gas filter and it still does not turn on.

Posted on Nov 03, 2008

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1 Answer

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IDK if you have more than one problem. Code P0123: throttle position sensor/switch a circuit high input. Plausible causes would include, TPS not mounted correctly, TPS not properly adjusted, Wiring to the TPS is damaged (ground wire touching another wire), or the TPS sensor is defective. Your symptoms could be caused by an electrical or a mechanical failure. First repair this code and see if it fixes your driveability issue. Please write back and let me know how you are making out, good luck.

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Well it really doesn't matter much. I would probably clear the codes and see which ones come back first.
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Have you checked the map sensor? I have known a few vehicles that did this. Sometimes it would go 5 miles, other times 30. Martin, they would get the same code, O2 sensor. If so, I would try to replace that and it probably will solve the issue. The car would die a few times a day. If you have anymore questions, let me know Martin. I am here to help you.

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