ok guys this is my first time posting on here so Im sorry if this question has already been asked, but i searched and couldnt find anything on it.

im sure the answer is easy but im just a little worried about my baby.

so the last few days my car, which is a 2007 350z enthusiast, has taken a couple extra seconds to start, i assumed i just needed a new battery but wasnt worried about it. so this morning i went to get gas before work, got gas, then my car wouldnt start. I got a jump and now my Service engine soon light is on. I ran the code at work, P0603, which basically means theres a problem with the power supply circuit i guess.

Could this light be coming on simply because i need a new battery, which is being installed right now or because there is a larger issue, like the ECU or a bad connection? My car has never had any issues before and was running fine after the jump, nothing out of the ordinary.

any help here would be great, im just a little worried and dont want to go back to nissan not knowing what im talking about.

 

Make suree the terminals are tight in the battery..

 

And I had a ses light too after I unhooked my battery for winter and put it back in. I cleared the code and it never came back. Sometimes our ecu and battery can be fussy