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Discussion Starter · #1 ·
So what is this an initiation rite for new Frontier owners? Brake light and battery light are on, was intermintent but now it's anytime the key is on. When it first happened the amp guage needle was in the lower half. Not showin any codes stored. Need HELP.
 

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Year? Guessing your truck is new? If so, bring it in for WARRANTY work. The first 36K is on them.

Are battery posts/terminals clean or gunked/crudded up?

My parking brake dash light decided to become temperamental just shy of 36K...dealer fixed it for free.
IFF you're out of warranty, then there are methods to address this via the (advanced) search function.
 

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2016 Frontier SV 4x4 Crew Cab
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strange that both of those would light up. i dont see how they could be related but you never know...
since you said the battery gauge was low, check the battery voltage with a meter when it's running, if it isnt above 13v (usually around 14.2) then alternator is bad ... i have a cool cigarette lighter plugin that shows voltage, really handy.
brake light, usually is either the e-brake handle switch is screwed up (they are very touchy, mine the light doesnt go off unless i shove the handle all the way down, if I barely lift it, light comes on)
or the brake light comes on if the brake fluid is low... easy check under the hood there.
 

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Charging system warning light and brake warning light being on simultaneously is consistent with a charging system problem (Nissan's have been designed like that for decades). Loose battery cable connections are pretty common on these vehicles, especially when an aftermarket battery is installed, so make sure you can't turn the cables on the battery posts by hand and also make sure they are clean. Also, the regulator is controlled by the ECM based on input from a voltage sensor on the negative battery cable, so, if you have any aftermarket additions, make sure they are not grounded at the battery post or between the post and the voltage sensor; they should be grounded to the chassis.
A good charging system will charge between 13.2-15.5 volts at idle and at 3000 RPM, both with "loads" (headlights, heater, etc.) on and off. If the battery tests good, the connections are good but the voltage is not within spec, chances are your alternator is faulty. If you can afford it, it's best to stick with a genuine Nissan part.
 

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Charging system problem will cause the brake light to come on. Some ancient logic.
But a brake problem will not light up the charge light.

You have a charging issue, that's all you have. Fix the charging issue and the brake light will go out.

My stick shift will sometimes blink the charge and brake warning light if I lug the engine down too low, pretty much a near stall.
 

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That is Nissan's code for "Your alternator needs to be replaced". Technically, it indicates a problem with the charging system, but most of the time, it's a bad alternator.

Essentially, when those 2 lights come on together, you're driving on the battery. You need to do something about it right away or you'll end up on the side of the road calling for a tow.
 
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