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Engine-Codes – GMC – B0770 2015 GMC Sierra

B0770 2015 GMC Sierra Code - All Wheel Drive Indicator Circuit

Quick Answer

The B0770 diagnostic trouble code for a 2015 GMC Sierra relates to the All Wheel Drive (AWD) Indicator Circuit. Common causes include Faulty AWD indicator switch or sensor, Wiring issues or shorts in the AWD indicator circuit, Failed AWD control module. 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
B0770 2015 GMC Sierra indicates All Wheel Drive Indicator Circuit.
Common causes
Common causes include Faulty AWD indicator switch or sensor, Wiring issues or shorts in the AWD indicator circuit, Failed AWD control module.
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 Aug 18, 2024
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Code B0770 2015 GMC Sierra Description

The B0770 diagnostic trouble code for a 2015 GMC Sierra relates to the All Wheel Drive (AWD) Indicator Circuit. This code indicates that there is a malfunction in the circuit responsible for controlling the AWD indicator light on the dashboard. The AWD system in a vehicle like the GMC Sierra is crucial for providing traction and stability on various road conditions, especially in slippery or off-road situations. When this indicator circuit is not functioning correctly, it can lead to inaccurate information being displayed to the driver regarding the status of the AWD system.

OBDII Code B0770 2015 GMC Sierra - All Wheel Drive Indicator Circuit
B0770 2015 GMC Sierra Code - All Wheel Drive Indicator Circuit

Common Causes of B0770 2015 GMC Sierra

  1. Faulty AWD indicator switch or sensor.
  2. Wiring issues or shorts in the AWD indicator circuit.
  3. Failed AWD control module.
  4. Corrosion or damage to electrical connectors related to the AWD system.
  5. Issues with the AWD system itself, such as a malfunctioning transfer case.

Symptoms of B0770 2015 GMC Sierra

  1. The AWD indicator light on the dashboard may not illuminate when the AWD system is engaged.
  2. The AWD indicator light may flash intermittently or stay on constantly, even when the AWD system is not in use.
  3. The vehicle may experience issues with traction or stability, especially in challenging driving conditions.
  4. The vehicle may display error messages related to the AWD system on the dashboard screen.
  5. The vehicle may go into a reduced power or limp mode to prevent further damage.

How to Fix B0770 2015 GMC Sierra

  1. Begin by conducting a thorough visual inspection of the AWD indicator circuit, looking for any visible damage or loose connections.
  2. Use a multimeter to test the AWD indicator switch and sensor for proper functionality.
  3. Check the wiring harness for continuity and repair or replace any damaged wires.
  4. Test the AWD control module for faults and replace if necessary.
  5. Clear the trouble code from the vehicle's computer using a diagnostic scan tool and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix B0770 2015 GMC Sierra

The typical repair costs for resolving a B0770 code on a 2015 GMC Sierra can vary depending on the specific cause of the issue. In general, replacement parts such as a new AWD control module or sensor can range from $100 to $500, while labor costs at an auto repair shop may add another $100 to $300 to the total bill. Therefore, the total repair cost for addressing this code could fall within the $200 to $800 range. Keep in mind that actual costs may differ based on factors like location, shop rates, and parts availability. It's recommended to consult with a certified mechanic for a more accurate estimate.

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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 B0770 2015 GMC Sierra Code

1. What does the OBDII code B0770 mean on a 2015 GMC Sierra?

The code B0770 indicates an issue with the All Wheel Drive (AWD) Indicator Circuit, which is responsible for displaying the AWD status on the dashboard.

2. What are the common symptoms of the B0770 code on a 2015 GMC Sierra?

Symptoms may include the AWD indicator not illuminating, staying on constantly, or flashing unexpectedly, along with potential AWD system malfunctions.

3. What causes the B0770 code on a 2015 GMC Sierra?

Common causes include a faulty AWD indicator bulb or LED, damaged wiring or connectors in the AWD circuit, or a malfunctioning transfer case control module (TCCM).

4. Can the B0770 code affect the AWD system's performance?

Yes, in some cases, this code may indicate underlying issues in the AWD system that could affect its ability to engage or operate properly.

5. How can I diagnose the B0770 code on my GMC Sierra?

Start by inspecting the AWD indicator bulb or LED, checking for damaged wiring or loose connections, and scanning the transfer case control module for additional codes.

6. Is the B0770 code safe to ignore?

No, ignoring this code could lead to further AWD system issues or leave you unaware of AWD system functionality, especially in adverse driving conditions.

7. How do I fix the B0770 code on a 2015 GMC Sierra?

Repairs may include replacing a faulty AWD indicator bulb or LED, repairing or replacing damaged wiring, or reprogramming or replacing the transfer case control module.

8. Can a dead battery cause the B0770 code to appear?

A weak or dead battery can result in electrical issues, including this code, if it causes a disruption in the AWD indicator circuit.

9. How much does it cost to repair the B0770 code on a GMC Sierra?

Repair costs vary depending on the issue but typically range from $100-$300 for wiring repairs or bulb replacement, and up to $600 or more if the TCCM needs replacement.

10. Can I clear the B0770 code without fixing the problem?

You can clear the code temporarily with an OBDII scanner, but it will likely reappear unless the underlying issue is resolved.

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