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Engine-Codes – GMC – B3631 2018 GMC Sierra

B3631 2018 GMC Sierra Code - Adjustable Foot Pedal Inhibit Circuit

Quick Answer

The B3631 diagnostic trouble code (DTC) for a 2018 GMC Sierra refers to an issue with the Adjustable Foot Pedal Inhibit Circuit. Common causes include Faulty wiring or connectors in the adjustable foot pedal circuit, Malfunctioning adjustable foot pedal motor, Issues with the control module that manages the adjustable foot pedals. 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
B3631 2018 GMC Sierra indicates Adjustable Foot Pedal Inhibit Circuit.
Common causes
Common causes include Faulty wiring or connectors in the adjustable foot pedal circuit, Malfunctioning adjustable foot pedal motor, Issues with the control module that manages the adjustable foot pedals.
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 17, 2024
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Code B3631 2018 GMC Sierra Description

The B3631 diagnostic trouble code (DTC) for a 2018 GMC Sierra refers to an issue with the Adjustable Foot Pedal Inhibit Circuit. This code indicates that there is a malfunction in the circuit that controls the adjustable foot pedals in the vehicle. Adjustable foot pedals are a convenience feature that allows drivers to adjust the position of the pedals to suit their comfort and driving preferences. When this circuit malfunctions, it can affect the operation of the adjustable foot pedals, potentially leading to safety concerns and discomfort for the driver.

OBDII Code B3631 2018 GMC Sierra - Adjustable Foot Pedal Inhibit Circuit
B3631 2018 GMC Sierra Code - Adjustable Foot Pedal Inhibit Circuit

Common Causes of B3631 2018 GMC Sierra

  1. Faulty wiring or connectors in the adjustable foot pedal circuit.
  2. Malfunctioning adjustable foot pedal motor.
  3. Issues with the control module that manages the adjustable foot pedals.
  4. Electrical problems such as blown fuses or relays related to the circuit.
  5. Physical obstructions preventing the foot pedals from moving smoothly.

Symptoms of B3631 2018 GMC Sierra

  1. Inability to adjust the position of the foot pedals.
  2. Foot pedals moving erratically or not responding to adjustments.
  3. Warning light on the dashboard related to the adjustable foot pedals.
  4. Unusual noises coming from the foot pedal area when attempting to adjust them.

How to Fix B3631 2018 GMC Sierra

  1. Begin by conducting a thorough inspection of the adjustable foot pedal circuit, checking for any visible damage to wiring or connectors.
  2. Test the adjustable foot pedal motor to ensure it is functioning correctly. Replace if necessary.
  3. Scan the vehicle's computer system to identify any specific fault codes related to the adjustable foot pedal inhibit circuit.
  4. Check and replace any blown fuses or relays that may be causing the issue.
  5. If the problem persists, consult a professional mechanic or dealership for further diagnosis and repair.

Cost to Fix B3631 2018 GMC Sierra

The cost of repairing a malfunction in the adjustable foot pedal inhibit circuit can vary depending on the specific cause of the issue. On average, the repair costs for this type of problem can range from $150 to $500, including parts and labor. However, it is important to note that the actual cost may be higher or lower based on factors such as the location of the repair shop, the make and model of the vehicle, and the extent of the repairs needed. It is recommended to obtain a detailed estimate from a qualified mechanic before proceeding with the repair.

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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 B3631 2018 GMC Sierra Code

1. What does the OBDII code B3631 mean on a 2018 GMC Sierra?

B3631 indicates an issue with the Adjustable Foot Pedal Inhibit Circuit, which may prevent the adjustable pedals from functioning properly.

2. What are the common symptoms of code B3631?

Symptoms include the adjustable pedals not moving, a warning light on the dashboard, or the system being unresponsive when the pedal adjustment button is pressed.

3. What causes the B3631 code to appear?

Common causes include a faulty pedal adjustment switch, damaged wiring or connectors in the circuit, or a malfunctioning adjustable pedal motor.

4. How do I diagnose the B3631 code in a 2018 GMC Sierra?

Use a scan tool to confirm the code, visually inspect the wiring and connectors for damage, and test the pedal adjustment switch and motor for proper operation.

5. Can I still drive my GMC Sierra with the B3631 code?

Yes, the vehicle is still drivable, but the adjustable pedal feature may not work until the issue is resolved.

6. How do I fix the B3631 code?

Repair or replace damaged wiring, connectors, or the pedal adjustment switch. If the motor is faulty, it may also need replacement.

7. How much does it cost to repair the B3631 code?

The repair cost varies but typically ranges from $100 to $300, depending on whether the issue is with the switch, wiring, or motor.

8. Can a dead battery cause the B3631 code?

A low or dead battery is unlikely to cause this code, but electrical issues can sometimes trigger related faults.

9. Do I need a professional to fix the B3631 code?

If you are comfortable with automotive electrical systems, you can attempt repairs yourself. Otherwise, consult a professional mechanic.

10. Will clearing the B3631 code with a scan tool fix the problem?

Clearing the code may turn off the warning temporarily, but the underlying issue must be repaired to prevent the code from returning.

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