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I don't know about a Grand Cherokee, but in a 2005 Jeep Wrangler you turn your ignition 3 times with out turning the motor over. Turn your key to start, then off, then start, then off, then start and leave in start position, a code will be displayed in the odometer area. Maybe its the same for a Grand Cherokee.

If that doesn't work a scan tool is required.

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11y ago
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13y ago

With an OBD2 scan tool. or flip switch till odometer comes on repeat two times watch for code done means no codes

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15y ago

Simple: Plug a code reader into the diagnostic port (under steering wheel). A good auto parts store like O'Reilly or AutoZone can usually do this for free.

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9y ago

That requires a scan tool.

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15y ago

With a scan tool.

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Q: How do you run diagnostic fault codes on a 2005 Jeep Grand Cherokee?
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