B0775 GMC 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 GMC 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 GMC 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 GMC?
- 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 GMC?
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 GMC 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 B0775 GMC code?
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Information for Specific GMC Models
- B0775 2014 GMC Sierra — Four Wheel Drive High Indicator Circuit
- B0775 2015 GMC Sierra — Four Wheel Drive High Indicator Circuit
- B0775 2016 GMC Sierra — Four Wheel Drive High Indicator Circuit
- B0775 2017 GMC Sierra — Four Wheel Drive High Indicator Circuit
- B0775 2018 GMC Sierra — Four Wheel Drive High Indicator Circuit
Frequently Asked Questions about B0775 GMC Code
1. What are the common symptoms of OBDII code B0775 GMC related to the Four Wheel Drive High Indicator Circuit?
- The common symptoms include the Four Wheel Drive High indicator not illuminating or staying on constantly, indicating a potential issue with the circuit.
2. What are the possible causes of OBDII code B0775 GMC?
- The possible causes include a faulty Four Wheel Drive High indicator switch, wiring issues in the indicator circuit, or a malfunctioning transfer case control module.
3. How can I diagnose the OBDII code B0775 GMC?
- Diagnosis involves using a scan tool to read the code, checking the indicator switch for proper function, inspecting the wiring for any damage, and testing the transfer case control module.
4. Is it safe to drive with OBDII code B0775 GMC active?
- It is generally safe to drive with this code, as it primarily affects the Four Wheel Drive High indicator function and may not impact the vehicle's drivability.
5. How can I repair OBDII code B0775 GMC related to the Four Wheel Drive High Indicator Circuit?
- Repair options include replacing the faulty indicator switch, repairing any damaged wiring, or reprogramming the transfer case control module as needed.
6. Can resetting the OBDII code B0775 GMC clear the issue temporarily?
- Resetting the code may temporarily clear the issue, but if the root cause is not addressed, the code is likely to reappear once the problem persists.
7. Are there any common mistakes to avoid when dealing with OBDII code B0775 GMC?
- Common mistakes include overlooking simple wiring issues, failing to properly diagnose the indicator switch, or neglecting to check the transfer case control module.
8. Will OBDII code B0775 GMC cause the vehicle to lose Four Wheel Drive functionality?
- This code primarily relates to the Four Wheel Drive High indicator circuit and should not impact the actual Four Wheel Drive functionality of the vehicle.
9. How long does it typically take to repair OBDII code B0775 GMC?
- Repair time can vary depending on the exact cause of the code, but in general, diagnosing and repairing this issue can be done within a few hours to a day.
10. Can I fix OBDII code B0775 GMC on my own, or should I seek professional help?
- While some basic checks and repairs can be done by DIY enthusiasts, it is recommended to seek professional help, especially for more complex diagnostic and repair tasks related to this code.
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