Why Is My GMC Sierra Remote Start Not Working? Solutions, Fixes And How To Diagnose The Problem

The GMC Sierra is a reliable and popular pickup truck known for its durability and advanced features. One of the convenient features of the GMC Sierra is the remote start functionality, allowing you to start your vehicle from a distance. However, there may be instances when you encounter issues with your remote start not working as expected.

So, why is your GMC Sierra remote start not working? The most likely culprits include improper starting procedures, dead key fob batteries, check engine light being on, vehicle not in park, unlatched hood, coolant and oil pressure, excessive remote start requests, activated security system, and the key fob is inside the vehicle.

Continue reading to learn how to reset the possible reasons behind this problem and how to reset the remote start feature. You will also have an insight into how to diagnose the underlying causes and gain valuable tips to resolve the issue.

Why Is My GMC Sierra Remote Start Not Working?

There are several factors that can contribute to your GMC Sierra remote start not working as expected. They include the following.

1. Improper Starting Procedure

An improper starting procedure is the most common reason for your remote start failing to function. Following the correct starting procedure is essential to ensure the remote start feature functions correctly. 

Solution:

Here is how to properly remote start your GMC Sierra.

• Step 1: Ensure your vehicle is in a safe and open area, away from obstacles.
• Step 2: Press the lock button on your key fob to lock the doors of your GMC Sierra.
• Step 3: Locate the remote start button on your key fob. It is usually labeled with an icon of a circular arrow or a car with an arrow.
• Step 4: Hold the remote start button for approximately 4 seconds or until the engine starts.
• Step 5: Once the engine has started, the GMC Sierra’s lights may flash, or the horn may sound briefly to indicate a successful remote start.

Remember that your engine will run for 15 minutes before it automatically shuts down.

2. Dead Key Fob Batteries

The remote start feature relies on the key fob to send signals to the vehicle’s computer system. If the batteries in your key fob are dead or low, it can prevent the remote start feature from working. 

Solution:

Replace the batteries in your key fob and try using the remote start function again.

3. Check Engine Light Is On

If the check engine light is illuminated on your GMC Sierra, it may indicate an issue with the vehicle’s engine or emissions system. In some cases, the remote start feature will be disabled to prevent further vehicle damage.

Solution:

Here is how to troubleshoot your vehicle if your check engine light is on.

• Step 1: Check that the gas cap is securely fastened and in good condition. A loose or damaged gas cap can activate the check engine light.
• Step 2: Use an OBD-II scanner to retrieve the trouble codes stored in your vehicle’s onboard computer. These codes can provide insight into the specific issue triggering the check engine light.
• Step 3: Have your vehicle inspected by a qualified technician to identify and resolve any underlying issues causing the check engine light to be on. This is inclusive of the codes your scanner retrieved.

4. Your Vehicle Is Not In Park

For safety reasons, the remote start feature is designed to work only when the vehicle is parked. If your GMC Sierra is in gear or neutral, the remote start function will not activate. 

Solution:

Ensure your vehicle is in the park position before using the remote start feature.

5. Unlatched Hood

A safety feature of the GMC Sierra’s remote start system is the requirement for the hood to be securely latched. If the hood is not closed or latched properly, the remote start feature will not work. 

Solution:

Ensure the hood is fully closed and securely latched before using the remote start function.

6. Coolant and Oil Pressure

To protect the engine from potential damage, the remote start feature may be disabled if the coolant or oil pressure levels are too low. Low levels of coolant or oil can indicate a problem with the vehicle’s systems and should be addressed promptly. 

Solution:

Check the coolant and oil levels and top them up if necessary. Here is how to do it.

• Step 1: Check the coolant level by inspecting the reservoir’s markings and ensuring it is within the recommended range. Take out the oil dipstick, clean it , put it back, and then pull it out again to compare the oil level to the markings.
• Step 2: If the coolant or oil levels are low, gradually add the appropriate fluids, following the manufacturer’s specifications and using a funnel if necessary. Be careful not to overfill.
• Step 3: After topping up, securely close the coolant reservoir cap and properly reinsert the oil dipstick. Close the hood and start the engine to ensure proper circulation of the fluids.
• Step 4: Recheck the coolant and oil levels after a few minutes of the engine running and make any additional adjustments if needed.

7. Too Many Remote Start Requests

In some cases, the remote start feature may become temporarily disabled if there have been too many consecutive remote start requests. This safety measure prevents potential issues and excessive wear on the vehicle’s systems. 

Solution:

Allow a few minutes to pass before attempting to use the remote start function again.

8. Security System Is Activated

If the GMC Sierra’s security system is activated, it may prevent the remote start feature from working. Check if the security indicator light on the instrument panel is flashing or illuminated.

Solution:

If the security system is activated in your GMC Sierra, follow these steps to deactivate it:

• Step 1: Use the key fob to unlock the vehicle’s doors by pressing the unlock button.
• Step 2: Insert the key into the ignition and turn it to the “ON” position without starting the engine. Allow the vehicle to sit in this position for 10 minutes until the security light stops flashing.
• Step 3: After the security light turns off, turn the key to the “OFF” position and remove it from the ignition.
• Step 4: Wait for a few seconds, then attempt to start the engine. The security system should now be deactivated, allowing you to start your GMC Sierra normally.

9. Key Fob Is in the Vehicle

The GMC Sierra’s remote start feature is designed to prevent the engine from starting if the key fob is detected inside the vehicle. This is a safety measure to prevent unauthorized use of the vehicle. 

Solution:

Ensure that the key fob is outside the vehicle, and try using the remote start function again.

How To Reset GMC Sierra’s Remote Start?

If you have encountered issues with your GMC Sierra’s remote start feature, you can try resetting it by following these steps:

• Step 1: Unlock the car using the emergency key.
• Step 2: Get into the driver’s seat with your key fob.
• Step 3: Insert the key into the ignition and turn it to the ON position without starting the engine.
• Step 4: Hold the lock button on the key fob for a few seconds until the lights flash.
• Step 5: Turn off the ignition and remove the key.
• Step 6: Repeat steps 3 to 5 four times, ending in the ON position.
• Step 7: Get out of the vehicle and lock all the doors.

The remote start feature should now be reset, and you can attempt to use it again.

How To Diagnose GMC Sierra Remote Start Not Working?

Diagnosing the underlying cause of your GMC Sierra’s remote start not working can be done systematically. Here is a step-by-step guide to help you diagnose the issue:

Step 1: Check the key fob batteries

Ensure that the batteries in your key fob are not dead or low. Replace them if necessary.

Step 2: Disconnect and reconnect the battery

Using a wrench or socket set, loosen and remove the negative (-) battery cable, followed by the positive (+) cable, carefully lifting them away from the battery terminals. 

Attach the positive cable to the positive terminal and tighten it securely to reconnect. Then, connect the negative cable to the negative terminal and tighten it.

Step 3: Check for a check engine light

If the check engine light is on, it may indicate a problem that disables the remote start feature. Have your vehicle inspected by a qualified technician to diagnose and address any underlying issues.

Step 4: Verify the brake pedal switch

The remote start system requires the brake pedal to be fully depressed before starting the vehicle. Check if the brake pedal switch is working correctly. When the pedal is pressed, the switch should engage and release when the pedal is released.

Step 5: Wait for a few minutes

If you have attempted to use the remote start function multiple times in quick succession, it may become temporarily disabled. Wait for a few minutes before trying again.

By following these steps, you can systematically diagnose the cause of your GMC Sierra’s remote start not working and potentially identify and resolve the issue.

If your GMC Sierra’s remote start is not working as expected, you’re not alone in grappling with this issue. Similar remote start problems might also occur in other models, like the Hyundai Sonata, which might also have starting issues, such as a clicking noise and no-start situation. For Hyundai Sonata owners facing a clicking noise and no-start situation, our article on Hyundai Sonata won’t start clicking noise offers insights into diagnosing and resolving this specific issue. Additionally, if you’re dealing with a GMC Acadia that won’t start, our article on GMC Acadia won’t start provides valuable guidance for addressing starting-related concerns in that model. By understanding these various remote start and starting issues, you’ll be better prepared to troubleshoot and resolve them effectively.

FAQs

Below are a few extra related questions you might be wondering about now.

Conclusion

The GMC Sierra’s remote start feature offers convenience and ease of use. However, you may encounter issues with your GMC Sierra remote start not working. In that case, it’s important to understand the possible reasons, follow the necessary diagnostic steps, and resolve the problem. 

By ensuring proper starting procedures, checking key fob batteries, addressing any check engine light issues, verifying the vehicle’s park position and hood latch, and considering other factors like coolant and oil levels, you can increase the chances of successfully troubleshooting the remote start problem.