Engine-Codes - Gmc - B0977 GMC

B0977 GMC Code - Start Indicator Control Circuit

- Code Popularity: 540 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents

|What are the Possible Causes of the B0977 GMC Code?

  • Faulty Ignition Mode Switch
  • Ignition Mode Switch harness is open or shorted
  • Ignition Mode Switch circuit poor electrical connection
  • Faulty Body Control Module (BCM)

|How to Fix the B0977 GMC 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 B0977 GMC code?

Labor: 1.0

The cost to diagnose the B0977 GMC 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.

|What are B0977 GMC code possible symptoms?

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

|What Does the B0977 GMC Code Mean?

The Ignition Mode Switch has 3 LEDs that indicate the vehicle power mode. When the vehicle is in the Off mode, the Off LED may illuminate. Pressing the lower button of the ignition mode switch, the vehicle enters the accessory mode and ACC LED will illuminate. Keeping the lower button pressed for about 5-6 seconds, the vehicle enters run mode with the engine off and the START LED will illuminate. All these LEDs have the voltage supplied from the Body Control Module (BCM) through the ignition mode switch supply voltage circuit. The ground path for each LED is controlled by the BCM.

Start Indicator Control Circuit

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