Warning Key System Fault

Faults and Technical chat for the Nissan Pulsar
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plinguk
Posts: 2
Joined: Tue Mar 10, 2020 12:53 pm

Warning Key System Fault

Post by plinguk » Tue Mar 10, 2020 12:59 pm

Hi there,

My 2016 Nissan Pulsar Tekna is constantly displaying a warning with alert for a Key System Fault.

I have taken to a NISSAN dealership who ran diagnostics and ultimately just replaced the key fob batteries which hasn't removed the constant warning.

Both sets of keys appear to be working as they should. Any advice why this is occurring and what it mean?

Thanks!
Alex

Pulsar Key System Fault.jpg


PulsarNismo94
Posts: 45
Joined: Tue Nov 26, 2019 12:45 am

Re: Warning Key System Fault

Post by PulsarNismo94 » Sat Mar 14, 2020 3:36 pm

Have you had a new key/keys?
Will have a look on Monday if theres any bulletins out regarding this, also let us know if you figure it out!
-Tommo
Nissan Pulsar 1.6 Dig-T '15

PulsarNismo94
Posts: 45
Joined: Tue Nov 26, 2019 12:45 am

Re: Warning Key System Fault

Post by PulsarNismo94 » Sat Mar 14, 2020 3:38 pm

P.s. this can happen if you carry both keys together.
Nissan Pulsar 1.6 Dig-T '15

Gwendoline
Posts: 1
Joined: Wed Sep 09, 2020 12:50 pm

Re: Warning Key System Fault

Post by Gwendoline » Wed Sep 09, 2020 12:55 pm

my keys do not work
I have taken the car to the Nissan dealer and they are saying they will only replace 1 key

Both keys are faulty
The engine cannot read the key

I do not keep the keys together

User avatar
SplanK
Posts: 191
Joined: Thu Jun 08, 2017 1:23 pm

Re: Warning Key System Fault

Post by SplanK » Wed Sep 09, 2020 9:47 pm

Sometimes the batteries that are swapped in at dealers may not be the best. Its simple enough to DIY it. I bought some Duracell ones of ebay with long expiry dates, swapped them myself and problem solved.

The other thing that can cause this issue is a fault car battery especially if it appears straight after start-up. Modern cars are very fussy over the voltages, and during startup a depleted or faulty battery can result in low voltages which often results in the car throwing all sort of weird and wonderful faults. When my Fiamm battery, the first indication was the dash going dark during engine turn over. The engine turn over was lethargic and sometimes resulted in the MIL turning on due to what it thought was a miss fire.

However, I would first try and swap both remote batteries myself, and if that does not work, start looking at the car battery voltage at rest (after a few hours of not running), and if you can, during engine cranking.
2019 Renault Megane RS300
2012 Micra Acenta 1.2 DIG-S

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