Help! 2012 Laredo check engine light on. What dealer tells me today is true? - JeepForum.com
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Unread 11-23-2011, 12:38 AM   #1
seaflow
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Join Date: Oct 2011
Location: Carlsbad, CA
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Help! 2012 Laredo check engine light on. What dealer tells me today is true?

I bought a new 2012 Laredo three days ago.

Yesterday I just notice that: "check engine light" (of instrument panel) is always on if the key is put on an "ON" position without starting engine.

Today afternoon, I ask the dealer the reason. He tells me this is exactly how it is supposed to be. Is what he says true?

The whole issue is like this:
(1) On Ignition Switch, there are four positions: "OFF", "ACC", "ON", and "START". When I insert a key and turn it from "OFF" to "ON", the check engine light turns on and stays on steadily.

(2) Then, when I turn the key to the "Start" position to start engine, the engine gets started and the "check engine light" turns off.

Is what dealer says true? If not, what may be the problem?

Thanks for your expert comment!

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Unread 11-23-2011, 06:01 AM   #2
tjkj2002
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What the dealer say's is true.
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Unread 11-23-2011, 07:14 AM   #3
fljeepleo
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Quote:
Originally Posted by seaflow
I bought a new 2012 Laredo three days ago.

Yesterday I just notice that: "check engine light" (of instrument panel) is always on if the key is put on an "ON" position without starting engine.

Today afternoon, I ask the dealer the reason. He tells me this is exactly how it is supposed to be. Is what he says true?

The whole issue is like this:
(1) On Ignition Switch, there are four positions: "OFF", "ACC", "ON", and "START". When I insert a key and turn it from "OFF" to "ON", the check engine light turns on and stays on steadily.

(2) Then, when I turn the key to the "Start" position to start engine, the engine gets started and the "check engine light" turns off.

Is what dealer says true? If not, what may be the problem?

Thanks for your expert comment!
No push button start? My Laredo E came with push button start.

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Unread 11-23-2011, 08:15 AM   #4
ColdCase
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EPA wants all or most of the bulbs checked routinely, so manufactures often illuminate all or most of the idiot lights in the on/run position. That position turns both the engine and accessories on. If you don't intend to run the engine, use the accessory position. Think in terms that the "on" term here is in reference to the engine. If you turn the engine on and it is not running, then there may be a problem. So alert the driver with an idiot light.
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Unread 11-23-2011, 06:40 PM   #5
rudeney
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This is a federally mandated function of the OBDII system. The MIL must remain illuminated for at least 20 seconds when the engine is not running and the ignition switch is in the "run" position (accessible via the second press of the START button without the brake pedal depressed). This is required to verify its operation. If the MIL did not illuminate in this situation, there would be no way to know if the light was functioning or not. The bulb could be burned out and it would then be assumed that everything is operating proper. All OBDII compliant vehicles (mandated as all vehicles built since January 1996) operate this way.
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Unread 11-24-2011, 01:19 AM   #6
FlyinJeep
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What he said...In fact in some states (NC is this way) if the check engine light does not illuminate with the engine off and switch to "on" your vehicle will fail the emission inspection. This is used to verify that the light is not burned out or tampered with to hide a fault condition.
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Unread 11-27-2011, 01:56 AM   #7
seaflow
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Location: Carlsbad, CA
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When I insert a key and turn "Ignition Switch" to the "ON" position without starting engine, my concern is: all other lights flash for a short while and automatically turn off, except this "check engine light" (that turns on and is always on).

When my engine gets started, I do see the "check engine light" become off.

So is the "check engine light" a concern on the new 2012 Laredo?
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Unread 11-27-2011, 05:26 PM   #8
rudeney
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No, this behavior is nothing to be concerned about. It's perfectly normal. As long as the light is not on after the engine has been started, there are no problems.
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