B0770 2018 GMC Sierra 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 2018 GMC Sierra 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 2018 GMC Sierra 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 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 B0770 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 B0770 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 B0770 2018 GMC Sierra code?
Need more information on how to fix the B0770 2018 GMC Sierra code? Get Access to Factory Service Manuals
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Frequently Asked Questions about B0770 2018 GMC Sierra Code
1. What are the common symptoms of OBDII code B0770 in a 2018 GMC Sierra related to the All Wheel Drive Indicator Circuit?
The common symptoms include the all-wheel drive indicator light not functioning properly or staying on constantly.
2. What can cause the OBDII code B0770 to trigger in a 2018 GMC Sierra?
The code B0770 is typically triggered by a malfunction in the all-wheel drive indicator circuit, which may be caused by a faulty indicator switch, wiring issues, or a problem with the indicator control module.
3. How can I diagnose the cause of OBDII code B0770 in my 2018 GMC Sierra?
To diagnose the issue, you can start by checking the indicator switch for proper operation, inspecting the wiring for any damage or loose connections, and testing the indicator control module for faults using a diagnostic scanner.
4. Can I continue driving my 2018 GMC Sierra with OBDII code B0770 present?
It is generally safe to drive the vehicle with this code, but it is recommended to have the issue diagnosed and repaired as soon as possible to prevent any potential complications or further damage.
5. What are some repair tips for fixing OBDII code B0770 in a 2018 GMC Sierra?
Repair tips include checking and replacing any damaged wiring, ensuring the indicator switch is functioning correctly, and if necessary, replacing the indicator control module.
6. Is it possible to reset the OBDII code B0770 in a 2018 GMC Sierra without making any repairs?
While you can clear the code with a diagnostic scanner, it is important to address the underlying issue causing the code to prevent it from reoccurring.
7. How much does it typically cost to repair OBDII code B0770 in a 2018 GMC Sierra?
The cost of repairs can vary depending on the specific cause of the issue, but it may involve replacing the indicator switch, repairing wiring, or replacing the indicator control module, which could range from moderate to high costs.
8. Can a DIY enthusiast fix OBDII code B0770 in a 2018 GMC Sierra?
Depending on the individual's skill level and access to tools, some DIY enthusiasts may be able to diagnose and repair this issue themselves, especially if it involves simple tasks like checking wiring connections.
9. Will OBDII code B0770 affect the performance of my 2018 GMC Sierra?
While the code itself may not directly impact the vehicle's performance, it is essential to address the underlying issue promptly to ensure all systems are functioning correctly.
10. How long does it take to repair OBDII code B0770 in a 2018 GMC Sierra?
The repair time can vary depending on the specific cause of the issue and the availability of parts, but it may take a few hours to a day for a professional mechanic to diagnose and fix the problem.
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