B0770 GMC Code - All Wheel Drive Indicator Circuit
Quick Answer
The All Wheel Drive (AWD/4WD Auto) 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
- B0770 GMC indicates All Wheel Drive 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 B0770 GMC Description
The TCCM tests the AWD indicator circuit for unexpected voltage by monitoring the B+ supplied by the BCM on the indicator dimming control circuit by grounding the AWD indicator control circuit for 2 seconds during the Bulb Test at key ON.
What are the Possible Causes of the DTC B0770 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 B0770 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 B0770 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 B0770 GMC code?
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Information for Specific GMC Models
- B0770 2014 GMC Sierra — All Wheel Drive Indicator Circuit
- B0770 2015 GMC Sierra — All Wheel Drive Indicator Circuit
- B0770 2016 GMC Sierra — All Wheel Drive Indicator Circuit
- B0770 2017 GMC Sierra — All Wheel Drive Indicator Circuit
- B0770 2018 GMC Sierra — All Wheel Drive Indicator Circuit
Frequently Asked Questions about B0770 GMC Code
1. What are the common symptoms of OBDII code B0770 GMC (All Wheel Drive Indicator Circuit)?
- The common symptoms include the all-wheel drive indicator light not illuminating or staying on constantly, indicating a potential issue with the AWD system.
2. What are the possible causes of OBDII code B0770 GMC?
- The code B0770 GMC can be caused by a faulty all-wheel drive indicator switch, damaged wiring or connections in the indicator circuit, or a malfunctioning AWD control module.
3. How can I diagnose the OBDII code B0770 GMC issue?
- To diagnose the issue, you can use a diagnostic scanner to retrieve the trouble codes, inspect the indicator switch and circuit for any visible damage, and perform a thorough check of the AWD system components.
4. What are some repair tips for resolving OBDII code B0770 GMC?
- Repair tips may include replacing the faulty all-wheel drive indicator switch, repairing any damaged wiring or connections, and resetting the AWD system to clear the trouble code.
5. Can I continue driving my vehicle with OBDII code B0770 GMC present?
- It is not recommended to continue driving your vehicle with the B0770 code present, as it may indicate a potential issue with the AWD system that could affect the vehicle's drivability and safety.
6. How much does it cost to repair OBDII code B0770 GMC?
- The cost of repairing OBDII code B0770 GMC can vary depending on the specific cause of the issue and the labor rates in your area. It is advisable to consult a professional mechanic for an accurate estimate.
7. Is OBDII code B0770 GMC a serious issue?
- While OBDII code B0770 GMC may not always cause immediate drivability issues, it is important to address the underlying problem to ensure the proper functioning of the all-wheel drive system.
8. Can a DIY enthusiast fix OBDII code B0770 GMC at home?
- Depending on your level of automotive expertise, you may be able to diagnose and repair OBDII code B0770 GMC at home. However, it is recommended to seek professional help if you are unsure or unfamiliar with the repair process.
9. How long does it take to repair OBDII code B0770 GMC?
- The repair time for OBDII code B0770 GMC can vary based on the cause of the issue and the complexity of the repair. Simple repairs may take a few hours, while more complex issues may require additional time.
10. Can OBDII code B0770 GMC reset on its own?
- OBDII codes like B0770 GMC may reset on their own if the underlying issue is intermittent. However, it is advisable to diagnose and repair the problem to prevent potential reoccurrence in the future.
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