Engine-Codes - Generic - B0770

B0770 Code - All Wheel Drive Indicator Circuit

- Code Popularity: 4,719 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents

|What are the Possible Causes of the Code 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 B0770 Code?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

|What is the Cost to Diagnose the Code B0770?

Labor: 1.0

The cost to diagnose the B0770 code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

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|What are Code B0770 Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

|What Does the B0770 Code Mean?

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. The indicator dimming control circuit is the LED feed circuit and continuously supplies B+ to the 2WD HI, 4WD Auto, 4WD HI, and 4WD LO LEDs. When the AWD mode has been selected by the driver, the Transfer Case Shift Control Module (TCCM) provides a ground through the AWD indicator control circuit illuminating the LED.
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.

All Wheel Drive Indicator Circuit

|Need more Information on the B0770 Code?

Need more information on how to fix the B0770 code? Get Access to Factory Service Manuals

|Code B0770 Information for Specific Makes

|Need Help with the B0770 Code?

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