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Engine-Codes – GMC – B0780 2017 GMC Sierra

B0780 2017 GMC Sierra Code - Four Wheel Drive Low Range Indicator Circuit

Quick Answer

The B0780 diagnostic trouble code (DTC) for a 2017 GMC Sierra relates to the Four Wheel Drive Low Range Indicator Circuit. Common causes include Faulty indicator switch, Wiring issues or shorts in the circuit, Blown fuse related to the indicator circuit. 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 2017 GMC Sierra indicates Four Wheel Drive Low Range Indicator Circuit.
Common causes
Common causes include Faulty indicator switch, Wiring issues or shorts in the circuit, Blown fuse related to the indicator circuit.
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 B0780 2017 GMC Sierra Description

The B0780 diagnostic trouble code (DTC) for a 2017 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 controlling the indicator light that signals when the vehicle is in four-wheel drive low range mode. The low range mode is typically used for off-road driving or when additional torque is needed, such as when towing heavy loads.

OBDII Code B0780 2017 GMC Sierra - Four Wheel Drive Low Range Indicator Circuit
B0780 2017 GMC Sierra Code - Four Wheel Drive Low Range Indicator Circuit

Common Causes of B0780 2017 GMC Sierra

  1. Faulty indicator switch.
  2. Wiring issues or shorts in the circuit.
  3. Blown fuse related to the indicator circuit.
  4. Malfunctioning indicator light.
  5. Corrosion or poor connections in the circuit.

Symptoms of B0780 2017 GMC Sierra

  1. Four-wheel drive low range indicator light not illuminating.
  2. Inability to engage or disengage four-wheel drive low range mode.
  3. Incorrect or intermittent operation of the indicator light.
  4. Dashboard warning light related to four-wheel drive system.
  5. Unusual noises or vibrations when attempting to switch to low range mode.

How to Fix B0780 2017 GMC Sierra

  1. Begin by diagnosing the specific cause of the issue using a diagnostic scanner to retrieve the trouble code and pinpoint the faulty component.
  2. Inspect the indicator switch, wiring, and fuse related to the indicator circuit for any visible damage or signs of wear.
  3. Test the indicator light to determine if it is functioning properly or needs to be replaced.
  4. Repair or replace any faulty components, such as the indicator switch, wiring, fuse, or indicator light.
  5. Clear the DTC from the vehicle's computer system and test the four-wheel drive low range indicator to ensure proper operation.

Cost to Fix B0780 2017 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 cost of parts and labor. In general, the repair for this type of issue could range from $100 to $300, including parts and labor. However, it is important to note that diagnostic time and labor rates at auto repair shops can vary significantly based on factors such as location, vehicle make and model, and engine type. It is recommended to check with local auto repair shops for a more accurate estimate based on your specific situation.

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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 2017 GMC Sierra Code

1. What are the common symptoms of OBDII code B0780 on a 2017 GMC Sierra related to the Four Wheel Drive Low Range Indicator Circuit?

- The common symptoms include the four-wheel-drive low range indicator not functioning properly or staying illuminated when not engaged.

2. What are the possible causes of OBDII code B0780 on a 2017 GMC Sierra?

- The possible causes could be a faulty low range indicator switch, damaged wiring or connectors in the circuit, or a malfunctioning control module.

3. How can I diagnose the issue causing OBDII code B0780 on my 2017 GMC Sierra?

- To diagnose the issue, you can start by visually inspecting the wiring and connectors related to the low range indicator circuit. Testing the low range indicator switch and checking for any fault codes in the control module can also help pinpoint the problem.

4. Can I still drive my 2017 GMC Sierra with OBDII code B0780 present?

- It is generally safe to drive the vehicle with this code, but it is recommended to address the issue promptly to ensure the proper functioning of the four-wheel-drive low range indicator.

5. What are some repair tips for fixing OBDII code B0780 on a 2017 GMC Sierra?

- Repair tips may include checking and replacing the low range indicator switch if necessary, repairing any damaged wiring or connectors, and resetting the control module after making the repairs.

6. Is it possible to reset OBDII code B0780 on a 2017 GMC Sierra without fixing the underlying issue?

- While you can clear the code temporarily, it is important to address the root cause of the problem to prevent the code from reoccurring.

7. How much does it typically cost to repair OBDII code B0780 on a 2017 GMC Sierra?

- The cost of repair can vary depending on the specific issue causing the code, but it may involve replacing the low range indicator switch, repairing wiring, or addressing control module issues.

8. Can extreme weather conditions affect the Four Wheel Drive Low Range Indicator Circuit and trigger OBDII code B0780 on a 2017 GMC Sierra?

- Yes, extreme weather conditions such as moisture or extreme temperatures can sometimes lead to electrical issues in the circuit, triggering the OBDII code B0780.

9. Are there any preventive maintenance steps I can take to avoid OBDII code B0780 on my 2017 GMC Sierra?

- Regularly checking and maintaining the four-wheel-drive system, including the low range indicator circuit, can help prevent issues that may trigger OBDII code B0780.

10. How long does it typically take to repair OBDII code B0780 on a 2017 GMC Sierra?

- The repair time can vary depending on the exact cause of the issue, but it may take a few hours to a full day to diagnose and fix the problem related to the Four Wheel Drive Low Range Indicator Circuit.

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