B0785 GMC Code - Two Wheel Drive High Range Indicator Circuit
Quick Answer
The Two Wheel Drive (2WD) High Range (HI) indicator circuit consists of a Light Emitting Diode (LED) feed circuit, an LED, and an 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
- B0785 GMC indicates Two Wheel Drive High 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 B0785 GMC Description
The TCCM tests the 2WD HI indicator circuit for unexpected voltage by monitoring the B+ supplied by the BCM on the indicator dimming control circuit by grounding the 2WD HI indicator control circuit for 2 seconds during the Bulb Test at key ON.
What are the Possible Causes of the DTC B0785 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 B0785 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 B0785 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
- B0785 2014 GMC Sierra — Two Wheel Drive High Range Indicator Circuit
- B0785 2015 GMC Sierra — Two Wheel Drive High Range Indicator Circuit
- B0785 2016 GMC Sierra — Two Wheel Drive High Range Indicator Circuit
- B0785 2017 GMC Sierra — Two Wheel Drive High Range Indicator Circuit
- B0785 2018 GMC Sierra — Two Wheel Drive High Range Indicator Circuit
Frequently Asked Questions about B0785 GMC Code
1. What are the common symptoms of OBDII code B0785 in a GMC vehicle?
- Common symptoms include the two-wheel drive high range indicator not functioning properly, dashboard warning lights illuminating, and potential issues with the vehicle's shifting performance.
2. What can cause the OBDII code B0785 in a GMC vehicle?
- The code B0785 is typically triggered by a malfunction in the two-wheel drive high range indicator circuit, which can be caused by issues such as wiring faults, faulty indicator switch, or a defective transfer case control module.
3. How can I diagnose the OBDII code B0785 in my GMC vehicle?
- To diagnose the code B0785, a thorough inspection of the indicator circuit and related components is necessary. This may involve checking the wiring for damage, testing the indicator switch, and scanning the transfer case control module for any fault codes.
4. Can I drive my GMC vehicle with the OBDII code B0785 present?
- It is generally not recommended to continue driving your GMC vehicle with the code B0785 present, as it can indicate potential issues with the vehicle's drivetrain system. It is advisable to address the problem promptly to prevent further damage.
5. How can I repair the OBDII code B0785 in my GMC vehicle?
- Repairing the code B0785 may involve fixing any wiring issues, replacing a faulty indicator switch, or repairing/replacing the transfer case control module as needed. It is recommended to consult a professional mechanic for an accurate diagnosis and repair.
6. Will resetting the OBDII code B0785 in my GMC vehicle make it go away permanently?
- Resetting the code B0785 may temporarily turn off the warning light, but if the underlying issue is not addressed, the code is likely to reappear. It is crucial to diagnose and repair the root cause of the problem to prevent further issues.
7. Can a DIY enthusiast fix the OBDII code B0785 in a GMC vehicle?
- Depending on the severity of the issue, a DIY enthusiast with the necessary tools and expertise may be able to address the code B0785 by checking the circuit, replacing components, and resetting the system. However, complex problems may require professional assistance.
8. Is the OBDII code B0785 in a GMC vehicle a serious issue?
- The code B0785 related to the two-wheel drive high range indicator circuit is not typically considered a critical issue that affects the safety of the vehicle. However, ignoring the problem can lead to drivetrain issues over time, so it is advisable to address it promptly.
9. How much does it cost to repair the OBDII code B0785 in a GMC vehicle?
- The cost of repairing the code B0785 can vary depending on the root cause of the problem, the extent of the repairs needed, and the labor rates in your area. It is recommended to obtain quotes from reputable mechanics for an accurate estimate.
10. Can the OBDII code B0785 affect the overall performance of my GMC vehicle?
- While the code B0785 primarily relates to the two-wheel drive high range indicator circuit, unresolved issues can potentially impact the vehicle's drivetrain performance and overall functionality. It is important to address the problem to maintain optimal vehicle performance.
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