obd scanners and check engine light

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10-11-2010, 11:33 PM

gdoogle

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obd scanners and check engine light

I'm having problems with an '02 Grand Caravan downshifting with a bump at 30mph. The check engine light is not on. A common issue it seems. A mechanic friend says he can scan for codes. Could the system be logging codes without the check engine light coming on?

Thanks

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