The GMC Sierra is one of the best-selling full-size pickup trucks in the US.
Like most vehicles, it comes equipped with various beeps and chimes.
If your Sierra keeps beeping and your unsure why, this article is here to help.
Table of Contents
1. Objects On the Passenger Seat
Items placed on the passenger seat, whether it’s a bag of groceries or your pet pooch, can activate a chime. The weight of these objects may be misinterpreted as a passenger not fastening their seatbelt, thereby triggering the chime.
If you find it necessary to place an item on the passenger seat, a straightforward solution is to secure the seat belt.
Malfunctioning Seat Sensor
In some instances, the passenger seat sensor could be defective, resulting in the occurrence of a beep even when the passenger seat is unoccupied.
A temporary workaround for this issue involves inserting the seatbelt, while the more lasting remedy entails replacing the faulty sensor.
2. Remote Alerts
Remote Left in Vehicle Alert
The Remote Left in Vehicle Alert feature is designed to sound an alert when the key fob is inadvertently left inside the vehicle.
When the vehicle is turned off and a fob remains in the vehicle, the horn will emit three beeps after all doors are closed.
Remote No Longer Left in Vehicle Alert
If the vehicle is on with a door open and then all doors are closed, the vehicle will check for key fobs inside.
If a key fob is not detected, the Driver Information Center (DIC) will display NO REMOTE DETECTED and the horn will chirp three times.
This occurs only once each time the vehicle is driven.
How To Toggle These Alerts
- Touch the Settings icon located on the Home Page of the infotainment display.
- Select “Vehicle” to reveal a list of available options.
- Choose ‘Remote Lock, Unlock, Start’.
- Use the “On” or “Off” options to toggle the alert feature.
Note that adjusting the “Remote Left in Vehicle Alert” setting also affects the “Remote No Longer In Vehicle Alert.”
3. Troubles with Door Latches
When door latches malfunction or become stuck, they can lead to the vehicle incorrectly registering a door as open.
This problem can be resolved by cleaning and lubricating all door mechanisms, ensuring both proper functionality and accurate signaling.
Its important to check also that all doors are closed properly.
4. Problems with Door and Hood Sensors
When a door sensor or hood latch sensor malfunctions, it can lead to audible beeping within the vehicle. These sensors play a crucial role in the car’s safety and security systems.
Should these sensors fail and erroneously signal that a door or the hood is ajar, the vehicle’s system responds by emitting beeping sounds. This alert aims to prompt swift action from the driver, ensuring both safety and security are maintained.
5. Key Fob Battery Depletion
When the key fob battery is running low, it can result in unexplained beeping as erratic signals are transmitted to the vehicle’s electronic system. These signals are interpreted as commands or alerts by the system.
To resolve this issue, the most common solution is to replace the key fob battery. It is essential to choose a high-quality battery, clean the interior of the fob, and ensure the battery is inserted correctly to prevent further beeping.
6. Blinker Left ON
Leaving the turn signal (blinker) engaged for an extended duration, typically exceeding 3/4 of a mile, can trigger a chime.
This chime serves as a safety reminder, prompting the driver to deactivate the turn signal after completing a turn or lane change.
7. Parking Brake Not Released Fully
Driving a GMC Sierra with the parking brake not fully released can trigger a beeping noise as a warning to prevent damage to the brake system and ensure safe driving conditions. This feature helps avoid unnecessary wear on the brakes and potential safety hazards.
The beeping noise could also indicate a faulty sensor that fails to detect the correct position of the parking brake, falsely signaling that it’s not fully released.
“Check your parking brake. I have a 05 tahoe and had the same issue. Sometimes the parking break isn’t completely released so try that” – CarGurus.com
“It is the parking brake in all likelihood on the older GMs at least.” – CarGurus.com
8. Weak 12V Battery
A weak 12V battery can lead to a variety of issues.
To eliminate this as a potential problem, consider conducting a battery health check.
Many auto stores, such as AutoZone, offer this service for free.
Additionally, ensure that the battery connections are secure and free from dirt and grime.
9. Aftermarket Devices
Frequently, enigmatic beeping sounds originate from aftermarket electronic devices that do not activate alerts on the dashboard or Driver Information Center (DIC).
Common origins of these beeping noises encompass:
- Aftermarket alarm systems
- Bluetooth adapters
- Radar detectors
- Dashcams, especially when encountering bumps
- GPS tracking devices
- Insurance company tracking devices
“I figured it out. My truck has a passtime elite-2 thing [GPS anti theft device] on it from the dealership I bought it. They didn’t reset it after my payment haha. I feel a little stupid lol” – SilveradoSierra.com
10. Faulty Ignition Switch
A common issue causing continuous beeping noises in vehicles, even after the key has been removed, is a faulty ignition switch.
This problem often arises when the switch’s internal mechanism, which detects the key’s presence, becomes jammed, leading to a false indication that the key is still inserted.
11. Teen Driver Speed Alerts
Within the truck’s Driver Information Center (DIC), there is an option to set up notifications for when the vehicle exceeds certain speed thresholds, a feature often used in conjunction with the “teen driver” settings.
Adjusting or turning off these notifications might require entering a specific PIN, and the alerts are typically shown on the DIC display.
12. Beeping from External Devices
In some cases, the beeping sound may not be coming from the truck itself but from external devices located inside or near the vehicle, such as wristwatches, electronic gadgets with low batteries, or alarms in the vicinity indicating low battery status or other warnings.
13. OnStar System Test Beeps
The occasional beeping heard may be due to the OnStar system performing regular diagnostic checks, which is something drivers might sporadically notice.
These beeps are simply an indication that the OnStar system is functioning correctly, and usually, no further action is needed unless accompanied by dashboard warning lights.
14. Rear Seat Reminder Alert
The subtle beeping sound emanating from beneath the dashboard could be the “check the back seat” reminder alert, which is intended to prevent leaving passengers or items unintentionally in the back seat.
This notification appears on the Driver Information Center (DIC) and can be toggled on or off through the DIC menu settings.
Additional Steps to Consider
Disconnect the Battery
Glitches in modern vehicles, which rely heavily on electronics, can cause mysterious beeps. Disconnecting the 12-volt battery’s negative (black) terminal for 10 to 20 minutes resets the vehicle’s systems.
Check All Fluid Levels
It’s worthwhile to verify the levels of various fluids, as discrepancies can trigger alerts:
- Engine Oil
- Brake Fluid
- Transmission Fluid
- Power Steering Fluid
- Windshield Washer Fluid
Consult a Mechanic or Dealership
For unresolved issues after basic troubleshooting, seek an experienced mechanic or a local GMC dealership. They possess the necessary tools and experience. If under warranty, prioritize the dealership and inquire about free initial diagnostics. Auto parts stores may offer free scans and advice.
Check for Recalls or TSBs
Use GMC’s recall page with your car’s VIN to check for recalls. Google searches for Technical Service Bulletins (TSBs) can reveal less serious issues causing beeps.
Use a Diagnostic Scanner
An OBD2 scanner, easily connected to the car’s OBD port, may help identify the issue. OBD apps allow smartphone connections for a convenient diagnosis. Research the codes online or consult vehicle-specific forums for advice.
Check the DIC (Driver Information Center)
When the beeping occurs can you see any lights come on at the same time on the DIC display? This can give a big clue as to what’s causing the beeping.