B0790 2016 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 2016 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.
Code B0790 2016 GMC Sierra Description
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.
What are the Possible Causes of the DTC B0790 2016 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 2016 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 2016 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.
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Frequently Asked Questions about B0790 2016 GMC Sierra Code
1. What does the OBDII code B0790 mean on a 2016 GMC Sierra?
The code B0790 indicates an issue with the Transfer Case Neutral Indicator Circuit, which may involve a malfunction in the wiring, sensor, or related components.
2. What are the common symptoms of a B0790 code?
Common symptoms include the transfer case not shifting properly, the neutral indicator light malfunctioning, or the vehicle being unable to switch into neutral.
3. What causes the B0790 code to appear?
The code can be caused by damaged or corroded wiring, a faulty transfer case control module, a defective neutral position switch, or electrical connectivity issues.
4. Can I drive my GMC Sierra with a B0790 code?
While driving may still be possible, it is not recommended as it may indicate issues with the transfer case that could lead to drivetrain damage.
5. How do I diagnose the B0790 code?
Diagnosis involves inspecting the wiring and connectors for damage or corrosion, testing the neutral position switch, and checking for faults in the transfer case control module.
6. How do I fix the B0790 code on my GMC Sierra?
Repairs may include replacing damaged wiring, cleaning corroded connectors, replacing the neutral position switch, or reprogramming or replacing the transfer case control module.
7. What tools are needed to troubleshoot the B0790 code?
You’ll need an OBDII scanner, a multimeter for testing electrical circuits, and potentially a wiring diagram specific to the 2016 GMC Sierra.
8. How much does it cost to repair the B0790 code?
Repair costs vary depending on the issue, but replacing a neutral position switch can cost $150–$300, while module replacement or wiring repairs may cost more.
9. Can a B0790 code be cleared without repairs?
Clearing the code with an OBDII scanner might temporarily remove it, but it will likely return if the underlying issue is not resolved.
10. Could a software update fix the B0790 code?
In some cases, a software update for the transfer case control module might address the issue, but this depends on the specific circumstances and diagnostics.
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