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· 08 Cummins
2,376 Posts
You can check codes by cycling the key ON-OFF-ON-OFF-ON leaving it in the ON position.

Codes should show up where the odometer is. This doesn't work all the time for all codes but it's a start to see what codes may have been thrown. Have a piece of paper and pen to write with as the codes don't stay up too long. It will say DONE once all codes have been displayed.
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