B0770 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 High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- B0770 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
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code B0770 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?
- 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?
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 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 Makes
- B0770 Buick — All Wheel Drive Indicator Circuit
- B0770 Cadillac — All Wheel Drive Indicator Circuit
- B0770 Chevrolet — All Wheel Drive Indicator Circuit
- B0770 GMC — All Wheel Drive Indicator Circuit
Frequently Asked Questions about B0770 Code
1. What are common symptoms of OBDII code B0770 (All Wheel Drive Indicator Circuit)?
The common symptoms of code B0770 include a non-functioning all-wheel drive indicator light on the dashboard and potential issues with the vehicle's all-wheel drive system.
2. What are the possible causes of OBDII code B0770?
Possible causes of code B0770 include a faulty all-wheel drive indicator switch, damaged wiring or connectors in the indicator circuit, or a malfunctioning all-wheel drive control module.
3. How can I diagnose OBDII code B0770?
Diagnosing code B0770 involves using a scan tool to retrieve the code, inspecting the all-wheel drive indicator switch and its wiring, and testing the all-wheel drive control module for proper functionality.
4. Can I continue driving with OBDII code B0770 present?
It is generally safe to drive with code B0770, but it is recommended to address the issue promptly to prevent potential problems with the all-wheel drive system and ensure accurate indication of the vehicle's drive mode.
5. How can I repair OBDII code B0770?
Repairing code B0770 may involve replacing the faulty all-wheel drive indicator switch, repairing damaged wiring or connectors, or replacing the malfunctioning all-wheel drive control module.
6. Will clearing the OBDII code B0770 make it go away permanently?
Clearing the code may temporarily turn off the check engine light, but if the underlying issue causing code B0770 is not addressed, the code is likely to reappear during subsequent driving cycles.
7. Are there any DIY repair tips for OBDII code B0770?
DIY repair tips for code B0770 include checking and cleaning the connections to the all-wheel drive indicator switch, inspecting for visible damage to wiring, and ensuring all components are securely in place.
8. Is OBDII code B0770 specific to a certain vehicle make or model?
Code B0770 can be specific to certain vehicle makes and models, particularly those equipped with all-wheel drive systems and corresponding indicator circuits.
9. Can extreme weather conditions trigger OBDII code B0770?
Extreme weather conditions may not directly trigger code B0770, but they can potentially exacerbate existing issues with the all-wheel drive indicator circuit due to temperature fluctuations or moisture exposure.
10. How important is it to address OBDII code B0770 promptly?
It is important to address code B0770 promptly to ensure the proper functioning of the all-wheel drive system, maintain accurate indication of the vehicle's drive mode, and prevent potential safety hazards on the road.
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