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Engine-Codes – GMC – B310E 2018 GMC Sierra

B310E 2018 GMC Sierra Code - Keyless Entry Transmitter 7 Battery

Quick Answer

The B310E code for a 2018 GMC Sierra specifically refers to an issue with the Keyless Entry Transmitter 7 Battery. Common causes include Low battery voltage due to age or excessive use, Battery drain from leaving the keyless entry transmitter in close proximity to other electronic devices, Faulty wiring or connections in the keyless entry system. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
B310E 2018 GMC Sierra indicates Keyless Entry Transmitter 7 Battery.
Common causes
Common causes include Low battery voltage due to age or excessive use, Battery drain from leaving the keyless entry transmitter in close proximity to other electronic devices, Faulty wiring or connections in the keyless entry system.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 11, 2024
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Code B310E 2018 GMC Sierra Description

The B310E code for a 2018 GMC Sierra specifically refers to an issue with the Keyless Entry Transmitter 7 Battery. The keyless entry system in modern vehicles allows for convenient access to the car without the need for a physical key. The transmitter is a crucial component of this system, sending signals to the vehicle's receiver to lock or unlock the doors, activate the alarm, or start the engine remotely.

OBDII Code B310E 2018 GMC Sierra - Keyless Entry Transmitter 7 Battery
B310E 2018 GMC Sierra Code - Keyless Entry Transmitter 7 Battery

Common Causes of B310E 2018 GMC Sierra

  1. Low battery voltage due to age or excessive use
  2. Battery drain from leaving the keyless entry transmitter in close proximity to other electronic devices
  3. Faulty wiring or connections in the keyless entry system
  4. Environmental factors such as extreme temperatures affecting battery performance
  5. Defective keyless entry transmitter battery

Symptoms of B310E 2018 GMC Sierra

  1. Difficulty locking or unlocking the doors using the keyless entry system
  2. Unresponsive keyless entry system when attempting to start the engine remotely
  3. Reduced range of the transmitter's signal
  4. Intermittent functioning of the keyless entry system
  5. Warning light on the dashboard indicating a keyless entry system malfunction

How to Fix B310E 2018 GMC Sierra

  1. Replace the battery in the Keyless Entry Transmitter 7 with a new one of the correct type and voltage.
  2. Test the transmitter to ensure that the new battery resolves the issue and that all functions are working properly.
  3. Check for any loose wiring or connections in the keyless entry system and repair as needed.
  4. Reset the keyless entry system by disconnecting the vehicle's battery for a few minutes and then reconnecting it to clear any error codes.
  5. If the problem persists, consult a professional technician for further diagnostics and repairs.

Cost to Fix B310E 2018 GMC Sierra

The cost of replacing the Keyless Entry Transmitter 7 Battery in a 2018 GMC Sierra can vary depending on the type of battery required and labor costs. On average, the cost of a new battery for the transmitter ranges from $5 to $20. Labor costs for this repair can range from $50 to $150, depending on the shop's hourly rates and the complexity of the job. Additional costs may apply if there are other underlying issues with the keyless entry system that need to be addressed. It's advisable to consult with a trusted auto repair shop for a more accurate estimate based on the specific circumstances of the vehicle.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B310E 2018 GMC Sierra Code

1. What does OBDII code B310E mean on a 2018 GMC Sierra?

Code B310E indicates an issue with the battery in Keyless Entry Transmitter 7, which refers to one of the programmed key fobs.

2. What are the symptoms of B310E on a 2018 GMC Sierra?

Common symptoms include difficulty locking or unlocking doors, the key fob not being detected, or intermittent keyless entry functionality.

3. What causes the B310E code to trigger?

The primary cause is a weak or dead battery in the key fob associated with Transmitter 7. Other causes could include poor electrical connections or a malfunction in the key fob.

4. How do I fix the B310E code on my GMC Sierra?

Start by replacing the battery in the affected key fob. If the issue persists, inspect the key fob for damage or have it reprogrammed by a dealership.

5. What type of battery does the key fob for a 2018 GMC Sierra use?

The key fob typically uses a CR2032 coin cell battery, but you should confirm by checking your owner’s manual or the battery itself.

6. How do I know which key fob is causing the B310E code?

Your GMC’s diagnostic system will identify the specific transmitter (e.g., Transmitter 7). You can test each fob to find the one that isn’t functioning properly.

7. Can a malfunctioning key fob drain the car’s battery?

While rare, a malfunctioning key fob could cause excessive communication with the vehicle, potentially draining the car battery over time.

8. Can I clear the B310E code without fixing the problem?

You can clear the code using a scan tool, but it will likely return if the underlying issue (e.g., low battery in the key fob) isn’t resolved.

9. Is it safe to drive with the B310E code active?

Yes, it’s safe to drive, but you may experience issues with keyless entry or starting the vehicle if the key fob battery is completely dead.

10. Do I need to reprogram the key fob after replacing the battery?

No, generally, replacing the battery does not require reprogramming. However, if the fob still doesn’t work, reprogramming may be necessary.

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