AutoCodes – Buick – B0977 Buick

B0977 Buick 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 Buick 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 817

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 Buick 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 Buick - Start Indicator Control Circuit - AutoCodes.com — B0977 Buick Code - Start Indicator Control Circuit

What does this mean?

What are the Possible Causes of the DTC B0977 Buick?

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 Buick?

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 Buick 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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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 Buick Code

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

- The common symptoms include the start indicator light malfunctioning or not illuminating properly when attempting to start the vehicle.

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

- The code B0977 in a Buick is typically caused by a faulty start indicator control circuit, a damaged wiring harness, or a defective start switch.

3. How can I diagnose the OBDII code B0977 in my Buick?

- To diagnose the B0977 code, you can use an OBDII scanner to read the code, inspect the start indicator light and its connections, and check the wiring harness for any visible damage.

4. What are the recommended repair tips for fixing OBDII code B0977 in a Buick?

- Repair tips for resolving the B0977 code may include repairing or replacing the faulty start indicator control circuit, repairing any damaged wiring, or replacing the start switch if necessary.

5. Can I drive my Buick with OBDII code B0977 present?

- It is not recommended to drive your Buick with the B0977 code present, as it may indicate a potential issue with the start indicator control circuit that could affect the vehicle's starting system.

6. How serious is OBDII code B0977 in a Buick?

- While the B0977 code itself may not directly impact the drivability of the vehicle, it is important to address the underlying issue promptly to ensure the proper functioning of the start indicator system.

7. Is it safe to attempt repairs for OBDII code B0977 in my Buick myself?

- If you have the necessary knowledge and experience working with automotive electrical systems, you may attempt to repair the B0977 code yourself. Otherwise, it is advisable to seek professional help.

8. How much does it typically cost to repair OBDII code B0977 in a Buick?

- The cost of repairing the B0977 code in a Buick can vary depending on the extent of the issue and the specific repairs needed. It is recommended to obtain quotes from automotive professionals for an accurate estimate.

9. Will resetting the OBDII system clear the B0977 code in my Buick?

- While resetting the OBDII system may temporarily clear the B0977 code, it is important to address the underlying issue causing the code to prevent it from reoccurring.

10. How can I prevent OBDII code B0977 from appearing in my Buick in the future?

- To prevent the B0977 code from appearing in the future, you can perform regular maintenance checks on the start indicator system, ensure all electrical connections are secure, and address any issues promptly to avoid further complications.