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B0775 2016 GMC Sierra Code - Four Wheel Drive High Indicator Circuit

Quick Answer

The B0775 diagnostic trouble code (DTC) for a 2016 GMC Sierra relates to the Four Wheel Drive High Indicator Circuit. Common causes include Faulty indicator light bulb or LED, Wiring issues such as a short circuit or open circuit in the indicator circuit, Malfunctioning transfer case 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
B0775 2016 GMC Sierra indicates Four Wheel Drive High Indicator Circuit.
Common causes
Common causes include Faulty indicator light bulb or LED, Wiring issues such as a short circuit or open circuit in the indicator circuit, Malfunctioning transfer case 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 Sep 14, 2024
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Code B0775 2016 GMC Sierra Description

The B0775 diagnostic trouble code (DTC) for a 2016 GMC Sierra relates to the Four Wheel Drive High Indicator Circuit. This code indicates that there is a malfunction in the circuit responsible for illuminating the indicator light that signals when the vehicle is in four-wheel drive high mode. The four-wheel drive high mode is essential for providing additional traction and stability in off-road or slippery road conditions. When this indicator circuit is not functioning properly, it can lead to confusion for the driver regarding the engagement status of the four-wheel drive system.

OBDII Code B0775 2016 GMC Sierra - Four Wheel Drive High Indicator Circuit
B0775 2016 GMC Sierra Code - Four Wheel Drive High Indicator Circuit

Common Causes of B0775 2016 GMC Sierra

  1. Faulty indicator light bulb or LED.
  2. Wiring issues such as a short circuit or open circuit in the indicator circuit.
  3. Malfunctioning transfer case control module.
  4. Corrosion or damage to connectors in the indicator circuit.
  5. Issues with the four-wheel drive system itself affecting the indicator circuit.

Symptoms of B0775 2016 GMC Sierra

  1. Four-wheel drive high indicator light not illuminating.
  2. Incorrect indicator light illumination, showing the wrong drive mode.
  3. Difficulty engaging or disengaging four-wheel drive high mode.
  4. Inconsistent or intermittent indicator light operation.
  5. Four-wheel drive system not functioning properly.

How to Fix B0775 2016 GMC Sierra

  1. Begin by performing a visual inspection of the indicator light and its circuit to check for any obvious signs of damage or corrosion.
  2. Use a multimeter to test the continuity of the wiring in the indicator circuit to identify any open or short circuits.
  3. Inspect and test the indicator light bulb or LED to ensure it is functioning correctly.
  4. Check the transfer case control module for any fault codes and perform any necessary diagnostic tests to determine if it is the source of the issue.
  5. Repair or replace any damaged components in the indicator circuit, such as wiring, connectors, or the indicator light, as needed.

Cost to Fix B0775 2016 GMC Sierra

The typical repair costs for addressing a B0775 code on a 2016 GMC Sierra can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, the cost of parts for this repair could range from $50 to $200, while labor costs could range from $100 to $300. However, it's important to note that these are rough estimates, and actual costs may vary based on factors such as location, the specific diagnosis time required, and labor rates at auto repair shops. It's recommended to consult with a qualified mechanic or repair shop to get a more accurate estimate for this 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 B0775 2016 GMC Sierra Code

1. What does the OBDII code B0775 mean on a 2016 GMC Sierra?

The B0775 code indicates a problem with the Four-Wheel Drive High Indicator Circuit, which controls the light on the dashboard showing when 4WD High is engaged.

2. What are the symptoms of the B0775 code on a 2016 GMC Sierra?

Common symptoms include the 4WD High indicator light not illuminating, staying on when it shouldn't, or erratic operation of the 4WD system.

3. What causes the B0775 code to appear on a 2016 GMC Sierra?

This code can be caused by a faulty Four-Wheel Drive High indicator bulb, wiring issues, a defective transfer case control module (TCCM), or a malfunctioning switch or sensor.

4. Is it safe to drive a 2016 GMC Sierra with the B0775 code?

Yes, it’s generally safe to drive, but you may experience issues engaging or confirming the engagement of 4WD High, which could be problematic in off-road or slippery conditions.

5. How can I diagnose the B0775 code on a 2016 GMC Sierra?

Diagnosis involves checking the wiring and connectors for the 4WD High indicator circuit, testing the indicator bulb, and scanning the TCCM for additional codes or faults.

6. Can a faulty transfer case control module cause the B0775 code?

Yes, a malfunctioning TCCM can cause communication issues with the 4WD High indicator circuit, triggering the B0775 code.

7. How do I fix the B0775 code on a 2016 GMC Sierra?

Repairs may include replacing a faulty indicator bulb, repairing damaged wiring or connectors, recalibrating or replacing the TCCM, or addressing issues with the 4WD switch.

8. How much does it cost to repair the B0775 code on a 2016 GMC Sierra?

The cost varies depending on the cause but can range from $50 for a bulb replacement to $500 or more if the TCCM needs replacement.

9. Can clearing the B0775 code fix the issue on a 2016 GMC Sierra?

Clearing the code may temporarily turn off the check engine light, but if the underlying issue isn’t fixed, the code will return.

10. Can a blown fuse cause the B0775 code on a 2016 GMC Sierra?

Yes, a blown fuse in the circuit powering the 4WD High indicator can cause the B0775 code. Always check fuses during diagnosis.

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