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B0790 2018 GMC Sierra Code - Transfer Case Neutral Indicator Circuit

Quick Answer

The B0790 diagnostic trouble code (DTC) for the 2018 GMC Sierra relates to the Transfer Case Neutral Indicator Circuit. Common causes include Faulty transfer case neutral indicator switch, Wiring issues or shorts in the indicator circuit, Corrosion or damage to the electrical connectors. 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
B0790 2018 GMC Sierra indicates Transfer Case Neutral Indicator Circuit.
Common causes
Common causes include Faulty transfer case neutral indicator switch, Wiring issues or shorts in the indicator circuit, Corrosion or damage to the electrical connectors.
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 06, 2024
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Code B0790 2018 GMC Sierra Description

The B0790 diagnostic trouble code (DTC) for the 2018 GMC Sierra relates to the Transfer Case Neutral Indicator Circuit. This code indicates that there is a malfunction in the circuit responsible for the transfer case neutral indicator light. The transfer case neutral indicator light is crucial for informing the driver of the current mode the transfer case is in, such as 2WD, 4WD, or neutral. If this indicator is not functioning properly, it can lead to confusion for the driver regarding the vehicle's current drive mode, potentially causing safety concerns and affecting the overall drivability of the vehicle.

OBDII Code B0790 2018 GMC Sierra - Transfer Case Neutral Indicator Circuit
B0790 2018 GMC Sierra Code - Transfer Case Neutral Indicator Circuit

Common Causes of B0790 2018 GMC Sierra

  1. Faulty transfer case neutral indicator switch.
  2. Wiring issues or shorts in the indicator circuit.
  3. Corrosion or damage to the electrical connectors.
  4. Defective transfer case control module.
  5. Malfunctioning instrument cluster or dashboard display.

Symptoms of B0790 2018 GMC Sierra

  1. Transfer case indicator light not working or flickering.
  2. Inability to shift between different drive modes.
  3. Incorrect drive mode display on the dashboard.
  4. Transfer case getting stuck in neutral.
  5. Increased difficulty in engaging 4WD or 2WD modes.

How to Fix B0790 2018 GMC Sierra

  1. Begin by conducting a thorough inspection of the transfer case neutral indicator circuit, checking for any visible damage or loose connections.
  2. Test the transfer case neutral indicator switch using a multimeter to determine if it is functioning correctly.
  3. Inspect the wiring harness for any signs of damage or corrosion, repairing or replacing any affected wires as necessary.
  4. Check the transfer case control module for proper operation and replace if deemed faulty.
  5. Finally, clear the DTC from the vehicle's memory using a diagnostic scan tool and test the indicator light to ensure it is working correctly.

Cost to Fix B0790 2018 GMC Sierra

The cost of repairing the Transfer Case Neutral Indicator Circuit can vary depending on the root cause of the issue and whether any parts need to be replaced. On average, the repair cost for this type of issue can range from $150 to $500, including parts and labor. However, it is essential to keep in mind that the specific diagnosis time and labor rates at auto repair shops can influence the final cost. It is advisable to obtain quotes from different service providers to ensure you receive 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 B0790 2018 GMC Sierra Code

1. What does OBDII code B0790 for a 2018 GMC Sierra mean?

This code indicates a problem with the Transfer Case Neutral Indicator Circuit in the vehicle.

2. What are the common symptoms of a Transfer Case Neutral Indicator Circuit issue?

Common symptoms include the neutral indicator not functioning properly, the transfer case not engaging correctly, or the vehicle getting stuck in neutral.

3. What are some possible causes of OBDII code B0790 in a 2018 GMC Sierra?

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

4. How can I diagnose the Transfer Case Neutral Indicator Circuit issue in my 2018 GMC Sierra?

Diagnosis typically involves using a diagnostic scanner to retrieve the specific fault code, inspecting the wiring and connectors for damage, and testing the neutral safety switch and transfer case control module.

5. Can I still drive my 2018 GMC Sierra with OBDII code B0790?

It is not recommended to drive the vehicle with this code present, as it may affect the proper operation of the transfer case and compromise safety.

6. How can I repair OBDII code B0790 in my 2018 GMC Sierra?

Repairing this code may involve replacing the neutral safety switch, repairing or replacing damaged wiring, or reprogramming the transfer case control module.

7. Will resetting the OBDII code B0790 in my 2018 GMC Sierra make it go away permanently?

Resetting the code may temporarily clear the warning, but if the underlying issue is not fixed, the code is likely to reappear.

8. Can a DIY enthusiast fix the Transfer Case Neutral Indicator Circuit issue in a 2018 GMC Sierra?

While some basic diagnosis and repairs can be done by a DIY enthusiast, complex electrical or module-related issues may require professional assistance.

9. How much does it typically cost to repair OBDII code B0790 in a 2018 GMC Sierra?

The cost of repair can vary depending on the specific issue, parts needed, and labor rates, but it is advisable to get a few quotes from reputable mechanics.

10. Is it important to address OBDII code B0790 promptly in a 2018 GMC Sierra?

Yes, addressing this code promptly is crucial to prevent potential safety hazards and ensure the proper functioning of the transfer case system in your vehicle.

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