B0780 GMC Code - Four Wheel Drive Low Range Indicator Circuit
Quick Answer
The Four-Wheel Drive (4WD) Low Range (LO) 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
- B0780 GMC indicates Four Wheel Drive Low Range 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 B0780 GMC Description
The TCCM tests the 4WD LO indicator circuit for unexpected voltage by monitoring the B+ supplied by the Body Control Module (BCM) on the indicator dimming control circuit by grounding the 4WD LO indicator control circuit for 2 seconds during the Bulb Test at key ON.
What are the Possible Causes of the DTC B0780 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 B0780 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 B0780 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.
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Information for Specific GMC Models
- B0780 2014 GMC Sierra — Four Wheel Drive Low Range Indicator Circuit
- B0780 2015 GMC Sierra — Four Wheel Drive Low Range Indicator Circuit
- B0780 2016 GMC Sierra — Four Wheel Drive Low Range Indicator Circuit
- B0780 2017 GMC Sierra — Four Wheel Drive Low Range Indicator Circuit
- B0780 2018 GMC Sierra — Four Wheel Drive Low Range Indicator Circuit
Frequently Asked Questions about B0780 GMC Code
1. What are the common symptoms of OBDII code B0780 GMC (Four Wheel Drive Low Range Indicator Circuit)?
- The common symptoms include the four-wheel-drive low range indicator not illuminating or staying on when engaged, indicating a potential issue with the circuit.
2. What are the possible causes of OBDII code B0780 GMC?
- The potential causes of this code may include a faulty low range indicator switch, wiring issues in the circuit, a defective transfer case control module, or a malfunctioning indicator lamp.
3. How can I diagnose the OBDII code B0780 GMC?
- To diagnose this code, you can start by inspecting the wiring and connections related to the low range indicator circuit, checking the switch for proper operation, and using a scan tool to retrieve additional diagnostic trouble codes for further insight.
4. What are some repair tips for addressing OBDII code B0780 GMC?
- Repair tips may include testing the low range indicator switch for continuity, inspecting and repairing any damaged wiring, ensuring proper grounding in the circuit, and replacing faulty components like the switch or control module if necessary.
5. Can I continue driving my vehicle with OBDII code B0780 GMC present?
- It is generally not recommended to drive the vehicle with this code present, as it may indicate a potential issue with the four-wheel-drive system that could affect its performance or safety.
6. How serious is OBDII code B0780 GMC?
- While this code may not cause immediate drivability issues, it is important to address it promptly to ensure the proper functioning of the four-wheel-drive low range indicator and the overall integrity of the system.
7. Is it possible to reset OBDII code B0780 GMC without fixing the underlying issue?
- Resetting the code without addressing the root cause will likely result in it reoccurring, as the underlying issue triggering the code needs to be identified and repaired to resolve the problem permanently.
8. Can a DIY enthusiast repair OBDII code B0780 GMC, or is professional assistance recommended?
- DIY enthusiasts with automotive repair experience may be able to diagnose and repair this code themselves, especially if they have the necessary tools and knowledge. However, if unsure, professional assistance is recommended.
9. Are there any recalls or technical service bulletins related to OBDII code B0780 GMC?
- It is advisable to check with a GMC dealership or online resources for any recalls or technical service bulletins related to this specific OBDII code, as manufacturer-issued information may provide guidance on known issues and solutions.
10. How can I prevent OBDII code B0780 GMC from occurring in the future?
- Regular maintenance, such as inspecting and maintaining the four-wheel-drive system components, ensuring proper wiring connections, and addressing any warning signs promptly, can help prevent the recurrence of this OBDII code in the future.
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