I have a 2013 Altima 3.5 SL I bought with only 15k miles in 2018. I was retiring and didn't want to have problems. I sold my 1988 Corvette right after I got it....(ironic both had the same 275 horsepower). I mention this to let you all know that I'm a 68 year old woman, have had 2 Corvettes, so know enough about cars not be helpless.
Got the "Keyfob Battery is Low" warning coming home last week. Came in and replaced the battery, have C2032's here for that reason. Started to leave again, and got the "Invalid ID" error. No time to fiddle, so started the car touching the Start Button with the fob, which works fine. Next day, checked the keyfob battery, it tested fine. Tried to start it again, kept getting "Invalid ID" again, and touching the fob to Start Button didn't work!? I was livid! I came to the Forum for clues...
I tried the "Reprogram" method twice, with no luck. I go to disconnect the battery next, and find the + post covered in blue! I removed both cables for a baking soda wash. I had the purple spray, so once dry, I reassembled. So the disconnect the battery trick DID NOT work. Now both my keyfobs weren't working. I started checking the cost of replacements, and how I could avoid the local Dealership in the process. Spent hours reading the Web for clues.
Went back outside and tried the "Keyfob Press" again...this time, the car suddenly went crazy, the dash lights blinked wildly, and the car refused to start! Tried 3 more times, and suddenly hear a loud "rat-tat-tat" noise, and knew that sound from my Corvette! Before getting it towed...got my Battery Charger out, hooked it up and plugged it in. The gauge showed Full...yet it was 2mm from the actual "100% Full" line. I put it on a trickle charge overnight. I checked my file (I keep detailed notes on my cars) and verified I bought a new battery in 2019.
Next morning, I check the car. The charger needle had moved that 2mm it was missing. With my keyfob in my pocket, I got in and pressed my Start Button...the car started right up, no weird dash activity, just solid power. Both keyfobs worked perfectly! Geeze...what a tempermental car!
I wanted to tell the many Forum members having Keyfob problems...it may not be the KEYFOB. Check the car battery for corrosion and a FULL charge. Apparently this Altima V6 needs a blast to start. Check your battery first, before spending hundreds on Keyfobs and locksmiths. Sure glad I did!
Good Luck,
Dawn88
San Francisco Bay Area, California