Some parts of your GMC Sierra are fundamental, regardless for your security or that of other drivers, making sure all these parts are in good working order is part of your legal and moral obligations. Today, we are going to speak about one of these parts, your vehicle’s blinkers, the turn signals. In fact, you may have a blinker problem on GMC Sierra, whether it’s because they’re burned out, they make a wierd noise, or whatever, we’re going to try to resolve your concerns today so that you can get back on the road with peace of mind. To achieve this, we will discover one by one several blinker problems on GMC Sierra and the answers to fix them.


The various blinker problems on GMC Sierra and their solutions

We will so create our article content according to the form of blinker trouble you are struggling with on your GMC Sierra. You should know that the turn signals are the only parts that allow other road users to know your changes in direction, so it is fundamental that they are in good working order.

Blinker problem that does not flash on one side on GMC Sierra

If you are in the circumstance in which, when you turn on your blinkers on the left or right side of your GMC Sierra they do not light up while on the other side everything operates normally. In this scenario it may be that both of your blinker bulbs are burnt out, first step for you to check the state of your blinker bulbs, look at our article content on changing the indicator bulb on GMC Sierra if you don’t know how to do this operation. Bear in mind to check the condition of the bulb socket, it may be oxidized and the electrical contact may be bad. If after examining the bulbs of the blinkers of your GMC Sierra are not burnt out, you will have to take off the comodo of your turn indicators to check that there is no false contact when you switch it on the problematic side.

Problem no blinker lights on GMC Sierra

Second blinker problem you may encounter on GMC Sierra, none of your flashers light up. If you are in this scenario there is a good chance that it is an electrical trouble that is the origin of the turn signal failure. You will have to check the turn signal fuse on your GMC Sierra, please check out our article content to locate it easily. In most instances your fuse is blown, otherwise it could be the fuse relay that is leading to the trouble. At last, if your fuses and relays are in good condition, check that the flasher comodo is well powered.

Problem a blinker doesn’t light up on GMC Sierra

Now the most general case of blinker problems on GMC Sierra, only one of your blinkers doesn’t work. In this scenario, the trouble is in most cases basic to fix and a change of a burnt-out bulb will be enough to solve it. If this is not enough, bear in mind to check the condition of the bulb socket which could generate a bad electrical contact and thus prevent the bulb from lighting up.

Blinker problem that lights up uncommonly on GMC Sierra

To conclude, the last trouble you may encounter is that the turn indicators of your GMC Sierra make a different noise when you turn them on or that they work randomly. Two cases, or you have a short circuit somewhere in your electrical installation or, your turn indicator unit is defective.


As seen earlier on this page, flashing lights are necessary security parts on your GMC Sierra, you must constantly be certain that they are operating effectively. No matter what the reason of the flasher trouble is, it must be treated as quickly as possible because accidents happen very fast and whether it’s a simple fender bender or something more significant, you are bound to be at fault.

If perhaps you have any additional questions about the GMC Sierra, do not hesitate to consult our GMC Sierra category.