Turn key on has power starts for 2 seconds and loses all power no dash lights nothing, 20 seconds later comes back on starts and 2 seconds later loses power 20 seconds later comes back on and keeps repeating over and over what is the problem
What is your question?
Computer issue Ecm needs relearned or a short in the wiring
What makes this problem better or worse?
Does it repeatedly no matter what
How long has your 2002 Nissan Altima had this problem?
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I would lean towards some kind of wiring concern that needs to have troubleshooting performed.
I do not think there is a "computer issue" -- at least as the primary concern.
