1997 dodge carvan engine 3.3 was running well

Hello there, I have a 91 dodge grand caravan and by the looks of it, you used the key on, key off, key on, key off, key on method to get those codes. If so, 12 is one code(number of key ons since last fault)(direct battery input to controller disconnected within last 50 too 100 ignition key ons), And for code 55, its just the completion of faultcode display on the check engine light. So basically, there is nothing to worry about. * *NOTE*-All information came right out of Haynes repair manual for 84-95 Dodge Carvans

MOST LIKELY HAS A PLUGGED TRANSMISSION FILTER.
TORQUE CONVERTOR CLUTCH FAILURE COMMON.
CHANGE TRANSMISSION FILTER AND ROAD TEST.
IF NOISE IS GONE AND RUNS NORMALLY, CHANGE TORQUE CONVERTOR AND RESEAL TRANSMISSION.

check your fan fuse. if ok the fan must be replaced

There is a small spring clip behind the handle. Remove the spring clip and the handle will slide off.

check the fan switch and the relay and grounds.make sure the cooling fan is working

sounds like the timing has jumped

you have water in the fuel line

as you know the front ones are rather easy to get to, but the rear bank is a bear..the best way is on a lift but you can get to them using a 3/8 rachet a 3inch extension and the plug socket.. take the air tube off the throttle body.. reach under the throttle body behind the engine you will feel the plug wires that way.. once you get the wires off the plugs are a pain but changable..

Try cam and/or crank sensor. If crank to cam timing isn't detected properly it'll crank all day but won't start. I had similar problem on my 2.5L V6 Avenger....drove home fine, no engine light, next morning it cranked, but wouldn't start. The crank sensor was faulty.

I had the same problem on my jeep come to find out it was the crank sensor not reading the motor runing