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Code 12 means that the battery input to the PCM was disconnected within the last 50 key cycles (this is a normal condition).
Code 55 means that you have reached the end of the codes. This is also normal
So if you have a 12, 55 code readout, you basically have no error codes stored.
Here is a link that lists the code sand what they mean.
I found this under Fixya; 2006 Subaru Outback; there were 25 answers: The problem is not with an emission issue as you would expect with a check engine light. The ER 55 code on the odometer means that there is a loss of communication with the ECU, that is why the check engine light is on and cruise light flashing. for what ever reason whenever your check engine light comes on the cruise becomes disabled. Lame I know. I work in the service department and have seen this issue a lot. The only real way to fix this issue is to go the dealer and have them do a reflash for your vehicle. If the ECU is bad it is covered under the federal emmission wrty for 8 years or 80,000 miles
12 just means the system was reset recently 55 mean end of codes so don't worry about them 2 however code 51 is an oxygen sensor error (O2 Sensor) a bad or shorted O2 sensor can cause it to run very bad and get poor gas mileage.
This is a communication error with the BIU (body integrated unit). Need to take to the dealer, possible that the ECU needs to be replaced to fix this issue. It should be covered under the federal emmission wrty.
ABS light is nothing to do with code 55 separate fault circuits.
Under dash there are two wires with mini spades at the end, connect one of them to the single black multiplug in position 2. Thats RHS plug inlet when you hold plug with tab lock on top. ABS sensor should then flash up error coded. Ignore code 11 thats a initial flash to let you nknow the difference between a fast and slow flash.
Let me know what code flashes up and I will tell you the symptom,
I had this occur on my 2007 Subaru Tribeca. ABS, Traction Control, Check Engine lights were solid, Cruise Control light was blinking and "Er SS" (commonly misread as Er 55) displayed on Trip Odometer. All lights were cleared after 10 or so miles. It appears this is a Speed Sensor (SS) reading error whereby the computer notices an irregularity with the readings taken from the four wheels. Most often it is a temporary and harmless glitch and sometimes a result of debris that is impeding the sensor's reading at one of the wheels.