AutoCodes – Chevrolet – B0977 Chevrolet

B0977 Chevrolet Code - Start Indicator Control Circuit

Quick Answer

The Ignition Mode Switch has 3 LEDs that indicate the vehicle power mode. Common causes include Faulty Ignition Mode Switch, Ignition Mode Switch harness is open or shorted, Ignition Mode 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: B0977 Chevrolet indicates Start Indicator Control Circuit.
Common causes: Common causes include Faulty Ignition Mode Switch, Ignition Mode Switch harness is open or shorted, Ignition Mode 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.

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Code Popularity 790

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 11, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B0977 Chevrolet 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.

OBDII Code B0977 Chevrolet - Start Indicator Control Circuit - AutoCodes.com — B0977 Chevrolet Code - Start Indicator Control Circuit

What does this mean?

What are the Possible Causes of the DTC B0977 Chevrolet?

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 DTC B0977 Chevrolet?

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 B0977 Chevrolet 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.

Need more information about the B0977 Chevrolet code?

Need more information on how to fix the B0977 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B0977 Chevrolet code diagnosed by a professional: Find a repair shop in your area

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B0977 Chevrolet Code

1. What are the common symptoms of OBDII code B0977 in a Chevrolet related to the Start Indicator Control Circuit?

The common symptoms include the start indicator light not illuminating, difficulty starting the vehicle, and potential issues with the vehicle's ignition system.

2. What are the possible causes of OBDII code B0977 in a Chevrolet?

Possible causes include a faulty start indicator control module, damaged wiring or connectors in the circuit, a malfunctioning ignition switch, or a problem with the start indicator light itself.

3. How can I diagnose the Start Indicator Control Circuit issue triggering OBDII code B0977 in my Chevrolet?

You can diagnose the issue by visually inspecting the wiring and connectors for any damage, testing the start indicator control module, checking the ignition switch for proper operation, and verifying the functionality of the start indicator light.

4. Can I still drive my Chevrolet with OBDII code B0977 present?

While it may be possible to drive the vehicle with this code present, it is recommended to address the issue promptly to avoid potential starting problems or further damage to the ignition system.

5. How can I repair OBDII code B0977 related to the Start Indicator Control Circuit in my Chevrolet?

Repair options may include replacing the faulty start indicator control module, repairing or replacing damaged wiring or connectors, fixing the ignition switch if necessary, or replacing the start indicator light.

6. Is it possible to reset OBDII code B0977 in a Chevrolet without fixing the underlying issue?

While you can clear the code with an OBDII scanner, it is important to address the root cause of the problem to prevent the code from reoccurring.

7. Are there any specific tools or equipment needed to diagnose OBDII code B0977 in a Chevrolet?

Basic tools such as a multimeter, wiring diagram for the vehicle, and an OBDII scanner are often useful for diagnosing and repairing issues related to the Start Indicator Control Circuit.

8. Can extreme weather conditions affect the Start Indicator Control Circuit and trigger OBDII code B0977 in a Chevrolet?

Yes, extreme temperatures or moisture can potentially impact the electrical components in the circuit, leading to issues with the start indicator control module or wiring.

9. How long does it typically take to repair OBDII code B0977 in a Chevrolet?

The repair time can vary depending on the specific cause of the issue and the complexity of the repair needed. Simple fixes may take a short time, while more extensive repairs could require more time.

10. Is it advisable to seek professional help for diagnosing and repairing OBDII code B0977 in a Chevrolet?

If you are not experienced with automotive electrical systems, it is recommended to seek professional help to accurately diagnose and repair the Start Indicator Control Circuit issue triggering OBDII code B0977 in your Chevrolet.