2004 subaru outback with the check engine light on and the cruse control light flashes

check brake fluid level -brakes --abs system

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

Run a diagnostic test to find the code that will tell you what component is not working.

Fix your car right away by clicking the link I attached
2011 Subaru Outback 2 5L Workshop Service Repair Manual

Hello, whenever the check engine light comes on the cruse light will flash as well, that is normal. The check engine light will not come on if fluid levels are low or if the temp is getting to high, I am pleased to know that you checked all of the fluids, most wouldn't have even the slightest thought to even try checking them. The On Board Diagnostics or OBD-2 for short only sets a check engine light when the ECM or Electronic Control Module reads a sensor value either too high or too low, but it has to read that same fault 3 consecutive times in a row to turn on the check engine light (w/ flashing cruise). Otherwise your check engine light would be going on and off all the time. I would go to your local parts store and have them check the codes for free because a dealer will have to charge you labor for them to check due to the knowledge needed to use the highly sophisticated scan tool they use. That way you can go either to an independent shop or a dealer with what the other scanner says is wrong which cuts down on the cost of repairs. They will probably ask you if you fueled up just before the engine light came on, in which that would be code P0440:EVAP leak(very small leak), that means the fuel tank sensor doesn't like how you put the fuel cap on. Subaru recommends AT LEAST 3 clicks when tightening your fuel cap. But until that code is checked you won't know whats wrong, if nothing went boom or bang you'll probably be ok. If it does end up being a fuel cap leak, then just loosen the cap put it back on and just make 1 full revolution, and just keep driving it. The light will go off within 3 full warm up cool down cycles or (drive cycles). I hope this info helps...(subyguru)...

shut the rocker switch off on top of the steering column this switch controls just the parking lights

u can clear/reset the check engine light either with a scan tool, hit clear codes, or u can just disconnect the battery, the scanner clearing method is preferred as disconnecting the battery can cause temporary stalling issues.

You need to replace your idle air controller (IAC). IAC basically opens and closes the throttle at idle so it stays at constants RPM.  Hope this helps.  Thanks for an honest rating and for using FixYa.

car threw a CEL at me with ER 55 and blinking cruse. the error code went away after a 5-6 restarts,dont worry it´s not a serious proplem.

55 EGR Temperature Sensor or Circuit

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,

Dan