<!-- from fixya rte -->What is code 12 on 1991 dodge spirit - 1991 Dodge Spirit

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There are several that would cause this. Your mechanic has the tester you need to read the codes for the bad ones. He has to plug it into a line that goes to your car computer.

My error code is 12 21 55. I believe the 21 was the o2 sensor which I related but now the car is still stallinn and turning off right after it turns over.

Check code 12
All that means is that you have loss power to the computer. Disconnected the battery.
This code will clear in 50 key cycles of the ignition key.
Hope this helps and please give feedback good luck FixYa

5-5 indicates no trouble codes available or recorded. There is no problems recorded in the computor.

• 11 No ignition reference signal detected during cranking (bad Hall effect) OR timing belt skipped one or more teeth; OR loss of either camshaft or crankshaft position sensor. Can cause the engine to stop working entirely with no limp-home mode.

check for trans fluid level or it may be vacume line to trans split or broken seeif some one can get the codes out of the trans computor

Sorry, but I think there is no code 38, please count the blinks carefully ok.

I can't seem to find code 12 but code 37 says it has to do with the Torque Converter Clutch Solenoid Circuit- Says there is probably a open or a short in the torque converter Clutch (TCC) in the solenoid circuit.

Code 64 Is stating that it has to do with the Flex Fuel Sensor reading high. The condition has to do with the Methanol Concentration sensor input is reading more than the maximum voltage that is acceptable.

Code 12 is battery disconnected lately. code 24 is faulty TPsensor. code 55 is end of message.
So, I'd replace my throttle position sensor.