B0977 Possible Causes
- Faulty Ignition Mode Switch
- Ignition Mode Switch harness is open or shorted
- Ignition Mode Switch circuit poor electrical connection
- Faulty Body Control Module (BCM)
First diagnose B0977 code
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Check 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 terminals.
Cost of diagnosing the B0977 code
Labor: 1.0
The cost of diagnosing the B0977 code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.B0977 Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
B0977 Description
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.
B0977 More Information
Need more information on how to fix the B0977 code?Get Access to Factory Service Manuals
B0977 Information for specific makes
- B0977 BUICK Start Indicator Control Circuit
- B0977 CADILLAC Start Indicator Control Circuit
- B0977 CHEVROLET Start Indicator Control Circuit
- B0977 GMC Start Indicator Control Circuit
Related Information
B0977 Comments
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