AutoCodes – GMC – B0790 2018 GMC Sierra

B0790 2018 GMC Sierra Code - Transfer Case Neutral Indicator Circuit

Quick Answer

The Neutral indicator circuit consists of a Light Emitting Diode (LED) feed circuit, an LED, and an LED control circuit. Common causes include Faulty Transfer Case Select Switch, Transfer Case Select Switch harness is open or shorted, Transfer Case Select Switch circuit poor electrical connection. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means: B0790 2018 GMC Sierra indicates Transfer Case Neutral Indicator Circuit.
Common causes: Common causes include Faulty Transfer Case Select Switch, Transfer Case Select Switch harness is open or shorted, Transfer Case Select Switch circuit poor electrical connection.
Severity: Moderate - service should be scheduled soon.
Can I drive?: The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

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Code Popularity 450

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Nov 18, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B0790 2018 GMC Sierra Description

The Neutral indicator circuit consists of a Light Emitting Diode (LED) feed circuit, an LED, and an LED control circuit. The Ignition 1 voltage circuit is the LED feed circuit and continuously supplies B+ to the Neutral LED. When the Neutral mode has been selected by the driver, the Transfer Case Shift Control Module (TCCM) provides a ground through the Neutral indicator control circuit illuminating the LED.
The TCCM tests the Neutral indicator circuit for unexpected voltage by monitoring the B+ supplied by the BCM on the Ignition 1 voltage circuit by grounding the Neutral indicator control circuit for 2 seconds during the Bulb Test at key ON.

OBDII Code B0790 2018 GMC Sierra - Transfer Case Neutral Indicator Circuit - AutoCodes.com — B0790 2018 GMC Sierra Code - Transfer Case Neutral Indicator Circuit

What does this mean?

What are the Possible Causes of the DTC B0790 2018 GMC Sierra?

Faulty Transfer Case Select Switch
Transfer Case Select Switch harness is open or shorted
Transfer Case Select Switch circuit poor electrical connection
Faulty Transfer Case Shift Control Module (TCCM)

How to Fix the DTC B0790 2018 GMC Sierra?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B0790 2018 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the B0790 2018 GMC Sierra code?

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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.