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2011 Nissan Altima CEL - no power to diagnostic interface

My wife’s 2011 Nissan Altima 2.5S threw a Check Engine Light. Runs fine, but we took it to Meineke for a free diagnostic scan. Problem: they said they couldn’t get the diagnostic unit to talk to the car because the diagnostic interface pinout wasn’t getting power through the #16 pin. They checked the fuses, but didn’t go any further for diagnoses for why it would be doing that.

Any suggestions?

That pin is usually powered by one of the fuses under the hood since power is on at all times. If the fuses have been properly checked and no trouble found then the wiring between those points needs to be traced out for a break in it.

My 2011 2.5S recently had a CEL light, it was still in warranty so I took it to the dealer and they determined the light was invalid and downloaded an updated software, you might want to call the dealer to see if an update is available for free.