P0300 Diagnostic Code - Random Misfire
Symptoms.
Engine may stumble or miss
Engine may be hard to start
you may notice no issues
Cause
Failing spark plugs or spark plug wires
Bad coil or coil pack
Failing oxygen sensor(s)
Bad fuel injector or more than one
Stuck exhaust valve
Bad catalytic converter
EGR valve or valve passage clogging
Bad camshaft position sensor
Bad PCM or ECM
The Fix
Best first action is a tune up, new plugs, wires, inspect all hoses and wire connections then reset the code. If it returns you will need to narrow it down to a system, coils and coil packs should be tested, catalytic converters for function ( do you smell rotten eggs?). A misfire that jumps cylinders could indicate a lean condition, do you have any other codes along with the 300? this will help clue you in to the source, check valve function to make sure they are opening and closing fully.
This is probably pone of the most difficult codes to troubleshoot, so start with the basics and work your way into the more expensive options, in many cases a good old tune up solves the problem, back it up with a fuel system cleaning and see where you stand.
Multiple/random cylinder misfire.
misfire cylinder #5
It is under the hood on the driver side.
P0442: Evaporative Emission System Leak Detected (small leak) P0455: EVAP Large Leak Detected
P0305 is cylinder number five misfire detected.
It may depend on the model year, but at least for the 1996 through 2000(?) model years it means "END". It simply means that there are no more codes to display.
Trouble code P0700 means:Transmission control system malfunction
P0700 eatx code present. You need to have the transmission computer checked for codes. P0700 just means that the trans has a code.
No
http://www.obd-codes.com/
Trouble code P1391 means: Intermittent loss of CMP or CKP
The 2009 Dodge Grand-Caravan has 12 valves.
The 2012 Dodge Grand-Caravan has 24 valves.