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Engine-Codes – GMC – B0997 2018 GMC Sierra

B0997 2018 GMC Sierra Code - Auxiliary Electronic Control Unit Performance

Quick Answer

The B0997 code for a 2018 GMC Sierra relates to the Auxiliary Electronic Control Unit (AUX ECU) performance. Common causes include Faulty wiring or connections, Malfunctioning AUX ECU, Software glitch in the ECU. 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
B0997 2018 GMC Sierra indicates Auxiliary Electronic Control Unit Performance.
Common causes
Common causes include Faulty wiring or connections, Malfunctioning AUX ECU, Software glitch in the ECU.
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 10, 2024
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Code B0997 2018 GMC Sierra Description

The B0997 code for a 2018 GMC Sierra relates to the Auxiliary Electronic Control Unit (AUX ECU) performance. The AUX ECU is responsible for controlling various auxiliary functions in the vehicle, such as power windows, door locks, and other accessories. When this code is triggered, it indicates that the ECU is not functioning as it should, which can lead to issues with the vehicle's overall performance and functionality.

OBDII Code B0997 2018 GMC Sierra - Auxiliary Electronic Control Unit Performance
B0997 2018 GMC Sierra Code - Auxiliary Electronic Control Unit Performance

Common Causes of B0997 2018 GMC Sierra

  1. Faulty wiring or connections
  2. Malfunctioning AUX ECU
  3. Software glitch in the ECU
  4. Poor ground connection
  5. Electrical system damage or corrosion

Symptoms of B0997 2018 GMC Sierra

  1. Power windows not operating properly
  2. Door locks malfunctioning
  3. Erratic behavior of auxiliary functions
  4. Dashboard warning light illuminated
  5. Loss of control over certain vehicle accessories

How to Fix B0997 2018 GMC Sierra

  1. Diagnose the specific cause of the B0997 code using a diagnostic scanner.
  2. Inspect the wiring and connections related to the AUX ECU for any damage or loose connections.
  3. Test the AUX ECU for proper functionality and replace if necessary.
  4. Clear the code from the vehicle's system and test the affected auxiliary functions to ensure they are working correctly.
  5. Check for any related software updates or recalls from the manufacturer that may address the issue.

Cost to Fix B0997 2018 GMC Sierra

The typical repair costs for addressing the B0997 code can vary depending on the specific cause of the issue. On average, the cost of parts for a new AUX ECU can range from $200 to $500, while labor costs can add another $100 to $200 to the total. Overall, the total repair cost could range from $300 to $700, including parts and labor.

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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 B0997 2018 GMC Sierra Code

1. What does the OBDII code B0997 mean on a 2018 GMC Sierra?

B0997 indicates an issue with the Auxiliary Electronic Control Unit (ECU) performance, typically related to improper functionality or communication.

2. What are the common symptoms of code B0997 on a 2018 GMC Sierra?

Symptoms may include warning lights on the dashboard, malfunctioning auxiliary features (like heated seats or mirrors), or intermittent electrical issues.

3. What causes the B0997 code on a GMC Sierra?

Common causes include faulty wiring or connections, a malfunctioning auxiliary ECU, or software glitches in the control module.

4. Can a blown fuse trigger the B0997 code?

Yes, a blown fuse related to the auxiliary circuits can lead to this code by interrupting power to the auxiliary ECU.

5. How do you diagnose the B0997 code on a 2018 GMC Sierra?

Diagnosis involves scanning for codes, inspecting wiring and connectors for damage, testing power and ground circuits, and verifying ECU functionality.

6. Can a loose connection cause the B0997 code?

Yes, loose or corroded connections in the auxiliary ECU harness can cause communication or performance issues, triggering the code.

7. Is the B0997 code serious?

While it may not immediately affect drivability, it can disrupt auxiliary functions, and ignoring it could lead to further electrical problems.

8. How do you fix the B0997 code on a GMC Sierra?

Repairs may include securing or replacing damaged wiring, resetting the ECU, or replacing the auxiliary control unit if it's defective.

9. Can disconnecting the battery clear the B0997 code?

Disconnecting the battery might temporarily clear the code, but it won’t fix the underlying issue causing the fault.

10. How much does it cost to repair the B0997 code on a 2018 GMC Sierra?

Costs vary depending on the issue but can range from $50 for simple wiring repairs to over $500 if the auxiliary ECU needs replacement.

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