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Engine-Codes – GMC – B0780 2018 GMC Sierra

B0780 2018 GMC Sierra Code - Four Wheel Drive Low Range Indicator Circuit

Quick Answer

The B0780 diagnostic trouble code (DTC) for a 2018 GMC Sierra relates to the Four Wheel Drive Low Range Indicator Circuit. Common causes include Faulty wiring or connectors in the indicator circuit, Malfunctioning low range indicator light, Issues with the 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
B0780 2018 GMC Sierra indicates Four Wheel Drive Low Range Indicator Circuit.
Common causes
Common causes include Faulty wiring or connectors in the indicator circuit, Malfunctioning low range indicator light, Issues with the 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 17, 2024
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Code B0780 2018 GMC Sierra Description

The B0780 diagnostic trouble code (DTC) for a 2018 GMC Sierra relates to the Four Wheel Drive Low Range Indicator Circuit. This code indicates that there is a malfunction in the circuit responsible for illuminating the low range indicator light on the dashboard when the vehicle is in four-wheel drive low mode. The low range indicator light is crucial for the driver to know when the vehicle is in low range mode, which provides increased torque and better traction for off-road driving or towing heavy loads.

OBDII Code B0780 2018 GMC Sierra - Four Wheel Drive Low Range Indicator Circuit
B0780 2018 GMC Sierra Code - Four Wheel Drive Low Range Indicator Circuit

Common Causes of B0780 2018 GMC Sierra

  1. Faulty wiring or connectors in the indicator circuit.
  2. Malfunctioning low range indicator light.
  3. Issues with the transfer case control module.
  4. Communication errors between components in the four-wheel drive system.

Symptoms of B0780 2018 GMC Sierra

  1. Low range indicator light not illuminating when in four-wheel drive low mode.
  2. Incorrect or intermittent illumination of the low range indicator light.
  3. Inability to engage four-wheel drive low range.
  4. Dashboard warning light related to the four-wheel drive system.

How to Fix B0780 2018 GMC Sierra

  1. Begin by conducting a visual inspection of the wiring and connectors in the indicator circuit to check for any visible damage or corrosion.
  2. Test the low range indicator light to determine if it is functioning properly or needs replacement.
  3. Use a diagnostic scan tool to check for any trouble codes stored in the transfer case control module and address any communication errors.
  4. If necessary, replace faulty wiring, connectors, the indicator light, or the transfer case control module to resolve the issue.

Cost to Fix B0780 2018 GMC Sierra

The cost of repairing the Four Wheel Drive Low Range Indicator Circuit issue can vary depending on the specific cause of the problem and the labor rates in your area. In general, you can expect to pay anywhere from $150 to $500 for parts and labor. Keep in mind that diagnostic time and labor rates at auto repair shops can fluctuate, so it's advisable to obtain quotes from multiple sources to ensure you're getting a fair price for 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 B0780 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code B0780 in a 2018 GMC Sierra?

The common symptoms of OBDII code B0780 in a 2018 GMC Sierra include the Four Wheel Drive Low Range indicator not functioning properly or illuminating intermittently.

2. What could be causing the OBDII code B0780 in a 2018 GMC Sierra?

The OBDII code B0780 in a 2018 GMC Sierra is typically caused by issues with the Four Wheel Drive Low Range indicator circuit, such as a faulty indicator switch, wiring problems, or a defective control module.

3. How can I diagnose the OBDII code B0780 in my 2018 GMC Sierra?

Diagnosing the OBDII code B0780 in a 2018 GMC Sierra involves inspecting the Four Wheel Drive Low Range indicator circuit, checking the indicator switch, testing the wiring for continuity, and scanning the vehicle's computer for fault codes.

4. Can I continue driving my 2018 GMC Sierra with the OBDII code B0780?

It is not recommended to ignore the OBDII code B0780 in a 2018 GMC Sierra, as it indicates an issue with the Four Wheel Drive Low Range indicator circuit, which could affect the vehicle's drivability and safety.

5. How do I repair OBDII code B0780 in my 2018 GMC Sierra?

To repair OBDII code B0780 in a 2018 GMC Sierra, you may need to replace the faulty Four Wheel Drive Low Range indicator switch, repair any damaged wiring, or reprogram the control module as needed.

6. Is the repair for OBDII code B0780 in a 2018 GMC Sierra costly?

The cost of repairing OBDII code B0780 in a 2018 GMC Sierra can vary depending on the specific issue causing the code, but it is recommended to address the problem promptly to prevent further damage.

7. Can I reset the OBDII code B0780 in my 2018 GMC Sierra using a scan tool?

Resetting the OBDII code B0780 in a 2018 GMC Sierra using a scan tool may temporarily clear the code, but it is essential to diagnose and repair the underlying issue to prevent the code from reoccurring.

8. Will OBDII code B0780 in my 2018 GMC Sierra affect the vehicle's performance?

While OBDII code B0780 in a 2018 GMC Sierra may not directly impact the vehicle's performance, it is crucial to address the issue promptly to ensure the proper functioning of the Four Wheel Drive Low Range indicator.

9. How long does it typically take to repair OBDII code B0780 in a 2018 GMC Sierra?

The time required to repair OBDII code B0780 in a 2018 GMC Sierra can vary depending on the specific cause of the issue, but it is advisable to consult a professional technician for an accurate diagnosis and repair estimate.

10. Can I prevent OBDII code B0780 from occurring in my 2018 GMC Sierra?

Regular maintenance and inspections of the Four Wheel Drive Low Range indicator circuit in a 2018 GMC Sierra can help prevent issues that may trigger OBDII code B0780, ensuring the proper functioning of the system.

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