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Engine-Codes – GMC – B0785 2016 GMC Sierra

B0785 2016 GMC Sierra Code - Two Wheel Drive High Range Indicator Circuit

Quick Answer

The B0785 diagnostic trouble code (DTC) for a 2016 GMC Sierra relates to the Two Wheel Drive High Range Indicator Circuit. Common causes include Faulty indicator switch or sensor, Damaged wiring or connectors 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
B0785 2016 GMC Sierra indicates Two Wheel Drive High Range Indicator Circuit.
Common causes
Common causes include Faulty indicator switch or sensor, Damaged wiring or connectors 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 11, 2024
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Code B0785 2016 GMC Sierra Description

The B0785 diagnostic trouble code (DTC) for a 2016 GMC Sierra relates to the Two Wheel Drive High Range Indicator Circuit. This code indicates a problem with the circuit responsible for the indicator that shows the vehicle is in two-wheel drive high range mode. In a four-wheel drive vehicle like the GMC Sierra, the ability to switch between different drive modes is essential for optimal performance under various driving conditions. When this indicator circuit malfunctions, it can lead to confusion for the driver regarding the actual drive mode engaged, potentially resulting in improper vehicle operation.

OBDII Code B0785 2016 GMC Sierra - Two Wheel Drive High Range Indicator Circuit
B0785 2016 GMC Sierra Code - Two Wheel Drive High Range Indicator Circuit

Common Causes of B0785 2016 GMC Sierra

  1. Faulty indicator switch or sensor
  2. Damaged wiring or connectors in the indicator circuit
  3. Malfunctioning transfer case control module
  4. Corrosion or water damage in the circuit components
  5. Software issues in the vehicle's computer system

Symptoms of B0785 2016 GMC Sierra

  1. Incorrect display on the drive mode indicator
  2. Inability to engage or disengage two-wheel drive high range mode
  3. Dashboard warning lights related to the transfer case
  4. Difficulty shifting between drive modes

How to Fix B0785 2016 GMC Sierra

  1. Diagnostic scan: Begin by using a diagnostic scan tool to retrieve the specific fault codes and pinpoint the exact cause of the issue.
  2. Inspection: Inspect the indicator switch, wiring, connectors, and transfer case control module for any visible damage or corrosion.
  3. Repair or replacement: Depending on the findings, repair or replace any faulty components, such as the indicator switch, damaged wiring, or control module.
  4. Clear codes: After completing the repairs, clear the fault codes from the vehicle's computer system to reset the indicator circuit.
  5. Test drive: Test the vehicle to ensure the indicator accurately reflects the selected drive mode and that the issue has been resolved.

Cost to Fix B0785 2016 GMC Sierra

The cost of repairing the Two Wheel Drive High Range Indicator Circuit can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, the cost can range from $100 to $500, including parts and labor. It's important to note that diagnostic time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate based on the specific circumstances of your 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 B0785 2016 GMC Sierra Code

1. What are the common symptoms of OBDII code B0785 in a 2016 GMC Sierra?

The common symptoms include the malfunction indicator light (MIL) illuminating on the dashboard and the two-wheel drive high range indicator not functioning properly.

2. What does the OBDII code B0785 indicate in a 2016 GMC Sierra?

The code B0785 indicates a problem with the Two Wheel Drive High Range Indicator Circuit in the vehicle.

3. What are the possible causes of OBDII code B0785 in a 2016 GMC Sierra?

Possible causes include a faulty indicator switch, damaged wiring or connectors in the circuit, or a malfunctioning transfer case control module.

4. How can I diagnose the issue related to OBDII code B0785 in my 2016 GMC Sierra?

Diagnosis involves using a scan tool to read the stored trouble codes, checking the wiring and connectors for any damage, and testing the indicator switch for proper functionality.

5. Can I still drive my 2016 GMC Sierra with the OBDII code B0785 illuminated?

It is generally safe to drive the vehicle with this code, but it is recommended to have it diagnosed and repaired as soon as possible to avoid potential transmission or drivability issues.

6. Are there any DIY repair tips for fixing OBDII code B0785 in a 2016 GMC Sierra?

DIY repair tips may include checking and repairing any damaged wiring or connectors in the circuit, and replacing the indicator switch if found faulty.

7. How much does it typically cost to repair OBDII code B0785 in a 2016 GMC Sierra?

The cost of repair can vary depending on the exact cause of the issue, but it may range from $100 to $300 for parts and labor at a repair shop.

8. Can a malfunctioning Two Wheel Drive High Range Indicator Circuit affect the overall performance of my 2016 GMC Sierra?

While the issue may not directly affect the performance of the vehicle, it can impact the driver's ability to engage or disengage the two-wheel drive high range mode.

9. Is it possible for the OBDII code B0785 to reoccur after being repaired in a 2016 GMC Sierra?

If the root cause of the issue is not properly addressed during the repair, there is a chance for the code to reoccur. It is important to ensure a thorough diagnosis and repair process.

10. How long does it take to repair OBDII code B0785 in a 2016 GMC Sierra?

The repair time can vary depending on the exact cause of the issue and the repair shop's workload, but it typically takes a few hours to complete the diagnosis and repair process.

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