Question about 2005 Dodge Grand Caravan
P0129-This Relates to Pressure for Barometric is too Low
P0685-This Relates to Open circuit for PCM/ECM Power Relay Control
P0688-This Relates to Circuit for PCM/ECM Power Relay Sense
I am not 100% sure that these are correct as I had to go through Chrysler settings to find this model.
I would check the airflow sensor first on the ducting from air cleaner to engine.
Check the spark plugs to ensure that they haven't fouled.
I hope this helps you,or get back to me with your results for further diagnosis.
Posted on Apr 02, 2011
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Posted on Jan 02, 2017
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