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Car Forum / Dodge / Dodge Trucks / July 2006

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03 ram 1500 hemi..engine light

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09 hemi - 19 Jul 2006 03:00 GMT
how can i get rid of and diagnos the engine light?
Tom Lawrence - 19 Jul 2006 03:31 GMT
> how can i get rid of and diagnos the engine light?

Turn ignition key ON-OFF-ON-OFF-ON, watch odometer, write down each
diagnostic code displayed ('Pxxxx', with xxxx being a 4-digit number), and
post here.
09 hemi - 19 Jul 2006 03:43 GMT
> > how can i get rid of and diagnos the engine light?
>
> Turn ignition key ON-OFF-ON-OFF-ON, watch odometer, write down each
> diagnostic code displayed ('Pxxxx', with xxxx being a 4-digit number), and
> post here.p1687,p1686,thanks for replying.
miles - 19 Jul 2006 04:31 GMT
>>> how can i get rid of and diagnos the engine light?
>> Turn ignition key ON-OFF-ON-OFF-ON, watch odometer, write down each
>> diagnostic code displayed ('Pxxxx', with xxxx being a 4-digit number), and
>> post here.p1687,p1686,thanks for replying.

P1686 - CAN data bus, immobilizer module no signal
P1687 - No Mechanical Instrument Cluster (MIC) BUS message

The instrument cluster module is not communicating with the main
computer.  That would also trip 1686 since it communicates to the main
computer through the MIC.

I have no idea what might cause that other than a loose connection in
the gauge cluster.
 
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