Experiencing problems with your 2012 Gmc Sierra Key Fob can be frustrating. Many owners encounter situations where their key fob becomes unresponsive or seemingly stops working altogether. Adding to the confusion, issues with the Tire Pressure Monitoring System (TPMS) can sometimes coincide with key fob malfunctions, leading to questions about whether these problems are related. Let’s delve into troubleshooting steps for your 2012 GMC Sierra key fob and understand its connection, or lack thereof, to your TPMS.
Understanding the Issue: Key Fob and TPMS Concerns
A common scenario involves owners noticing their 2012 GMC Sierra key fob failing to lock or unlock doors, or start the vehicle remotely. Simultaneously, they might observe TPMS warning lights or messages on their dashboard. Naturally, the question arises: is there a link between a faulty 2012 GMC Sierra key fob and TPMS problems?
One GMC owner detailed their experience at a dealership where they sought help for a TPMS reset. The dealership surprisingly claimed they were unable to reset the TPMS, leaving the owner puzzled and seeking alternative solutions. This highlights a common frustration: sometimes, even professional services may not immediately resolve these issues.
Key Fob Functionality and the TPMS
It’s crucial to understand that for the 2012 GMC Sierra, the key fob is not directly involved in activating the TPMS learn mode. While some vehicles might integrate key fob actions with TPMS reset procedures, this is not the case for this generation of GMC Sierra. Therefore, if you are facing TPMS issues, a malfunctioning 2012 GMC Sierra key fob, while inconvenient, is likely not the root cause of your TPMS problems.
Activating TPMS Learn Mode on a 2012 GMC Sierra
To initiate the TPMS learn mode on your 2012 GMC Sierra, you’ll need to follow a specific procedure that doesn’t involve the key fob at all. Here’s how you can do it:
- Turn the Ignition ON: Ensure your vehicle’s ignition is switched to the “ON” position, but do not start the engine.
- Engage the Parking Brake: Firmly set the parking brake. The parking brake light should be illuminated on your dashboard.
- Headlight Switch Maneuver: Locate your headlight switch and quickly turn it to the “PARK lamp” position four times in rapid succession (within 3-5 seconds).
- Confirmation Horn: If the procedure is executed correctly, the vehicle’s horn will sound with a double chirp. This indicates that your 2012 GMC Sierra has entered TPMS learn mode.
Once in learn mode, you will need a TPMS relearn tool to activate each tire sensor. A popular and affordable option is the EL-50448 tool, readily available online.
- Using a TPMS Relearn Tool:
- Start with the Left Front (LF) tire sensor. Hold the relearn tool near the valve stem and activate it according to the tool’s instructions. A horn chirp will confirm that the sensor has been successfully learned by the vehicle.
- Proceed clockwise to each sensor in the following order: Right Front (RF), Right Rear (RR), and Left Rear (LR), activating each sensor with the relearn tool.
- Upon successful learning of the Left Rear (LR) sensor, you will hear a single horn chirp followed by a double horn chirp. This sequence signifies the completion of the TPMS learning process.
Some tire shops utilize OBDII-style learn tools, which connect directly to your vehicle’s OBDII port. These tools bypass the need to manually activate the truck’s TPMS learn mode and directly transmit sensor data to the vehicle’s computer.
Diagnosing Your 2012 GMC Sierra Key Fob
Now, let’s shift focus back to your 2012 GMC Sierra key fob issues. If your key fob is not functioning correctly, here are some troubleshooting steps you can take:
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Check the Key Fob Battery: This is the most common culprit for a non-responsive key fob. Replace the battery in your 2012 GMC Sierra key fob with a new one. Refer to your owner’s manual or online resources for the correct battery type and replacement procedure.
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Clean the Key Fob Circuit Board: Over time, dirt, debris, or corrosion can accumulate on the key fob’s circuit board, hindering its functionality. Carefully open the key fob and inspect the circuit board. Use a cotton swab lightly dampened with isopropyl alcohol to gently clean the circuit board and buttons. Ensure everything is completely dry before reassembling the key fob.
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Body Control Module (BCM) and Keyless Entry: In the 2012 GMC Sierra, the Body Control Module (BCM) serves as the central control unit for both the TPMS and the keyless entry system. The BCM houses the receiver for signals from both the TPMS sensors and your 2012 GMC Sierra key fob. If you suspect a deeper issue, the BCM could be a potential area of concern.
TPMS Indicator Status
Observe your dashboard for TPMS warning lights or messages. Is the tire pressure light currently illuminated? Are you seeing a “Service TPMS” message? The status of these indicators can provide clues about the nature of your TPMS problem, which is separate from your 2012 GMC Sierra key fob functionality.
Next Steps
If you’ve tried the TPMS relearn procedure and addressed potential 2012 GMC Sierra key fob issues like battery replacement and cleaning, and you are still experiencing problems, consider the following:
- Professional TPMS Service: Visit a reputable tire shop or automotive service center for professional TPMS diagnosis and repair. They have specialized tools and expertise to pinpoint TPMS sensor malfunctions or other system issues.
- BCM Diagnosis: If you suspect a BCM problem, it’s best to consult with a qualified mechanic or automotive electrician. BCM issues can be complex and may require specialized diagnostic equipment.
- Key Fob Programming: If your 2012 GMC Sierra key fob remains unresponsive after battery replacement and cleaning, it might require reprogramming. Some auto locksmiths or dealerships can assist with key fob programming.
By systematically troubleshooting both your 2012 GMC Sierra key fob and TPMS, you can effectively narrow down the source of the problem and take appropriate steps towards a resolution. Remember to prioritize accurate diagnosis and seek professional help when needed to ensure the proper functioning of your vehicle’s keyless entry and tire pressure monitoring systems.
