93 caravan 3.3

i have problem to my van no ignition reference signal detected during cranking and i checking the code and i see 12 ,11,55 tell me if you have the problem please """""

http://www.allpar.com/fix/80s-codes.html
This site tells you what 11 is which seems like what you are talking about

Code 11 is a catch-all error that means the computer can't figure out the proper cylinder to fire. The 3.3liter engine has electronic ignition.
Electrically, there could be a faulty crankshaft position sensor, camshaft position sensor or a wiring break. Mechanically, there could be a problem with the timing belt.

In the modern engine, the spark to each cylinder is controlled bythe computer. All systems use a Crankshaft Position Sensor (CPS). This is used as a timing signal for number one cylinder and used in determining the engine speed (rpms). A second timing signal is generated from either a Hall Effect distributor or a Camshaft Position Sensor (electronic ignitions system). The computer must see both signals in order to send a signal to the coil (or coil pack module) in order to send spark to the cyclinder. Typically in this case, the computer sets a catch-all malfunction code of "no timing" when there is a problem in either sensor.