B0775 2015 GMC Sierra Code - Four Wheel Drive High Indicator Circuit
Quick Answer
The Four Wheel Drive HI indicator circuit consists of a Light Emitting Diode (LED) feed circuit, a LED, and a 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
- B0775 2015 GMC Sierra indicates Four Wheel Drive High 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 B0775 2015 GMC Sierra Description
The TCCM tests the 4WD HI indicator circuit for unexpected voltage by monitoring the B+ supplied by the BCM on the indicator dimming control circuit by grounding the 4WD HI indicator control circuit for 2 seconds during the Bulb Test at key ON.
What are the Possible Causes of the DTC B0775 2015 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 B0775 2015 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 B0775 2015 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 B0775 2015 GMC Sierra Code
1. What does the OBDII code B0775 mean on a 2015 GMC Sierra?
B0775 indicates an issue with the Four Wheel Drive (4WD) High Indicator Circuit, often related to a malfunction in the system that controls the 4WD high mode indicator.
2. What are the common symptoms of code B0775 in a 2015 GMC Sierra?
The most common symptoms include the 4WD high indicator light not functioning, intermittent 4WD system operation, or the inability to engage 4WD high mode.
3. What causes the B0775 code in a 2015 GMC Sierra?
Common causes include a faulty 4WD indicator bulb, damaged wiring or connectors in the 4WD high circuit, a malfunctioning transfer case control module, or a software issue.
4. Can I still drive my 2015 GMC Sierra with a B0775 code?
Yes, you can still drive the vehicle, but the 4WD system may not operate correctly, which could limit traction in certain conditions.
5. How do I diagnose a B0775 code on a 2015 GMC Sierra?
Start by checking the 4WD high indicator bulb, inspecting the wiring and connectors for damage, and using a scan tool to monitor the transfer case control module.
6. How can the B0775 code be fixed on a 2015 GMC Sierra?
Repairs may include replacing a faulty indicator bulb, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the transfer case control module.
7. Does a faulty transfer case control module always cause the B0775 code?
No, while it can be a cause, the issue is more commonly related to wiring problems or a failed indicator bulb.
8. What tools are needed to troubleshoot the B0775 code?
You’ll need an OBDII scan tool, a multimeter for testing circuits, and potentially a wiring diagram for the 4WD system.
9. Can a software update fix the B0775 code on a 2015 GMC Sierra?
In some cases, a software update to the transfer case control module can resolve the issue if it’s caused by a programming error.
10. How much does it cost to fix a B0775 code on a 2015 GMC Sierra?
Repair costs can vary depending on the issue, ranging from $50–$100 for minor repairs like replacing a bulb to $500 or more for module replacement.
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