Why GMC Sierra Power Outlet is Not Working | 6 Causes and Solutions

If you are experiencing issues with the power outlet in your GMC Sierra, you are not alone. Many owners have encountered problems where their power outlets suddenly stop working without any apparent reason. It can be frustrating, primarily if you rely on these outlets to charge devices or use other electrical accessories while on the go. We will explore some common reasons why your GMC Sierra Power Outlet is Not Working and provide possible solutions to help you get it up and running again. 

So if you are dealing with a non-functional power outlet in your GMC Sierra, read on to find out how to troubleshoot and resolve this issue.

What is Power Outlet in Car?

A power outlet in a car, also referred to as an auxiliary power outlet or car cigarette lighter, is a feature commonly found in modern vehicles. This outlet provides a 12-volt power source to charge or operate various electronic devices.  While most cars come equipped with a standard 12-volt outlet, some models may offer higher-voltage outlets for added convenience and compatibility with specific devices.
These power outlets have become essential for drivers and passengers who rely on their electronic gadgets during road trips or daily commutes.

Why did Cars Have Cigarette Lighters?

Why GMC Sierra Power Outlet is Not Working | 6 Causes and Solutions

The car’s power outlet is sometimes called a Cigarette Lighter due to its original purpose as a heating element for lighting cigarettes. Introduced in 1921, it was designed to provide convenience for smokers who wanted to light their cigarettes while on the road. 

Although the term Cigarette Lighter has evolved and the function of the power outlet has expanded beyond lighting cigarettes, it remains commonly used to describe this particular feature in cars.

Cause and Solution of GMC Sierra Power Outlet Is Not Working:

  • A blown fuse, 
  • Poor wiring or connections, 
  • A defective power outlet, 
  • Battery issues,
  • Electrical system issues, 
  • Or debris in the socket is all potential cause for the GMC Sierra power outlet is not working.

1. A blown Fuse

When a blown fuse occurs, it can result in the sudden cessation of power from an outlet. A short circuit or an overloaded power outlet often causes this issue. Fuses can wear out and become damaged, leading to their eventual blowing.


If you are experiencing a power outlet not working in your vehicle, one possible cause could be a blown fuse. It is a quick and easy fix. To resolve the issue, locate the fuse box, typically under the dashboard or hood of the vehicle. Once you have found the fuse box, identify the blown fuse and replace it with a new one. It will restore functionality to your power outlet and allow you to use it as intended.

2. Bad Wiring or Connections

One common cause of power issues with power outlets is terrible wiring or connections. Over time, the wiring or links that provide power to the outlet can become loose or damaged. It can result in a loss of control, making it challenging to charge devices or use accessories plugged into the outlet. To identify such problems, vital to scrutinize the wiring and connections.


If you are experiencing issues with your power outlet, such as intermittent power supply or flickering lights, the first step is to inspect the wiring and connections. Clean or tighten them if they are loose, which might cause the problem. If it is evident that the wiring or connections are damaged beyond repair, it is crucial to replace them promptly. Faulty electrical links can lead to further complications and even pose a safety hazard, so it’s best to address the issue promptly by either cleaning or tightening the existing ones or replacing them altogether.

3. Defective Power Outlet

It is essential to address this issue promptly, as a defective power outlet can pose serious safety hazards, including the risk of electrical shocks or even fires. Suppose you suspect the power outlet is damaged due to overheating, moisture, or physical damage. It is advisable to seek professional assistance from an electrician to diagnose and repair the problem correctly. Ignoring a faulty power outlet can lead to further damage and potentially more dangerous situations.


If you suspect the power outlet is faulty, the best solution is to replace it. It can be done by removing the old power outlet and installing a new one. By doing so, you can ensure that any potential issues with the current power outlet are resolved and that your electrical devices will receive a safe and reliable power source.

4. Battery issues

Battery issues can significantly hinder charging devices or using accessories that rely on power outlets. If the battery is weak or dead, the power outlet may not provide enough power to meet the device’s requirements. It can lead to frustrating situations where you cannot charge your phone, tablet, or other electronic gadgets.

To tackle this problem, essential to check the battery voltage using a multimeter. A multimeter allows you to measure the electrical potential difference between two points in an electrical circuit accurately. By checking the battery voltage, you can determine if it provides enough power or needs recharging or replacement.


If the battery turns out to be weak or dead, there are two possible solutions: recharge or replace it. Recharging is viable if you have access to a suitable charger and enough time for the process.

5.Electrical System Problems

Has your power outlet suddenly stopped working? If so, the culprit may be a significant problem with your electrical system. Electrical issues can arise from various sources, including the alternator, battery, or other relevant components. Determining the precise cause is crucial to resolve the problem effectively.

When faced with an electrical malfunction, it is essential to perform a thorough investigation. Start by checking the condition of your alternator. 


A faulty alternator can disrupt the power supply and prevent your outlets from functioning correctly. Next, examine the battery for any signs of damage or depletion. A dead or weak battery can also lead to electrical system failures and render your power outlets useless.
If neither the alternator nor the battery appears at fault, it’s time to investigate other potential culprits within the electrical system.

6. Dust or Debris in the Socket

Dust or debris in the socket can cause frustrating problems with power outlets. When these tiny particles accumulate within the socket, they can obstruct the connection when you attempt to plug in any device. This interruption prevents electricity from flowing through and renders the outlet useless. In situations like this, cleaning the socket is essential to restore functionality and eliminate potential hazards.


It is necessary to clean the socket thoroughly if dust or debris has accumulated on its surface. Regular maintenance is critical to ensuring the optimal performance of your outlets. Dusting off your sockets periodically prevents debris build-up and helps maintain a consistent electrical connection. By keeping your power outlets clean, you can avoid common frustrations associated with loss of power due to dust or debris interference.

Neglecting proper care for your power outlets may result in inconveniences such as devices not charging or powering up correctly.


If your GMC Sierra power outlet is not working, several potential causes must be considered. It could be a blown fuse or a faulty wiring connection. It is also possible that the outlet itself needs to be replaced. Before attempting any repairs, it is advisable to consult the vehicle’s manual or seek professional assistance. 

By addressing the issue promptly, you can ensure that your power outlet functions appropriately and avoid any inconvenience while on the road. Don’t let a malfunctioning power outlet hinder your driving experience – take action today!


What are the GMC Sierra Power Outlet specifications?

The GMC Sierra Power Outlet specifications are:
Input: 12V DC
Output: up to 350W
Amps: 10A

What are the benefits of using the GMC Sierra Power Outlet?

The GMC Sierra Power Outlet is a great way to keep your vehicle charged while you’re on the go. It has two ports, so you can use it to charge your phone or your laptop. It’s also easy to use – plug it in and start charging.

Scroll to Top