I have a 2004 maxima. Battery light kept staying on and car would go into limp mode. Replaced alternator and battery and car is still continues to havr battery light on and go into limp mode. NOW WHAT? ECM? PCM? New computer? I dont have the money to replace all this. Iam a single mom and out of work. Pleaseee help me.

 

Replace all what? You just said you replaced your battery and alternator.

Post your codes.

 

I only replaced the alternator and the serpentine belt and battery. So doing some research it says it could be engine control module or power control module. What do u think?

 

I presume you did the work yourself, otherwise it would be back in the shop, correct? So in doing this work yourself, you have access to tools and a multimeter, correct?

 

My stepdad has a garage and a lift and he fixes all of my cars. We have tools but what is the meter u speak of?

 

It's a meter for testing electrical stuff.

I think you should pick up an OBD2 dongle, get an app for your phone and post your codes. I'm not sure I will be able to help you out much beyond that. Maybe someone smarter than me will chime in. 6th gen forum is pretty dead most of the time, so I check in once in a while to see if there's anyone I might be able to help out.

 

Holy smokes, you replaced so many expensive parts but did not even read codes? Tell me that is not true.
Like User1 said, buy a cheap scanner and read codes. In today's cars you can do nothing with the electric without two things: OBDII scanner and multimeter. Google those terms.