AutoCodes – Chevrolet – B0978 Chevrolet

B0978 Chevrolet Code - Accessory 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: B0978 Chevrolet indicates Accessory 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 1,286

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 B0978 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 B0978 Chevrolet - Accessory Indicator Control Circuit - AutoCodes.com — B0978 Chevrolet Code - Accessory Indicator Control Circuit

What does this mean?

What are the Possible Causes of the DTC B0978 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 B0978 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 B0978 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.

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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 B0978 Chevrolet Code

1. What are the common symptoms of OBDII code B0978 in a Chevrolet related to the Accessory Indicator Control Circuit?

- Common symptoms include the accessory indicator light not functioning correctly, flickering, or staying on when it shouldn't.

2. What are the possible causes of OBDII code B0978 in a Chevrolet?

- Possible causes include a faulty accessory indicator control module, wiring issues, or a malfunctioning accessory indicator light.

3. How can I diagnose the cause of OBDII code B0978 in my Chevrolet?

- Start by checking the wiring and connections related to the accessory indicator control circuit. Use a multimeter to test for continuity and proper voltage. If necessary, inspect the control module and indicator light.

4. Is it safe to continue driving my Chevrolet with OBDII code B0978 present?

- It is generally safe to drive the vehicle with this code, as it primarily affects the accessory indicator functionality and does not directly impact the vehicle's drivability or safety.

5. Can I reset OBDII code B0978 in my Chevrolet without repairing the issue?

- While you can clear the code using an OBDII scanner, it is recommended to diagnose and repair the underlying problem to prevent the code from reoccurring.

6. Are there any DIY repair tips for fixing OBDII code B0978 in a Chevrolet?

- DIY repair tips include checking and repairing any damaged wiring, ensuring proper grounding, and replacing the accessory indicator control module if necessary.

7. Will OBDII code B0978 cause my Chevrolet to fail an emissions test?

- The Accessory Indicator Control Circuit issue typically does not affect emissions, so it should not cause your Chevrolet to fail an emissions test.

8. How much does it cost to repair OBDII code B0978 in a Chevrolet at a dealership or repair shop?

- Repair costs can vary depending on the exact cause of the issue, but expect to pay anywhere from $100 to $300 for parts and labor at a dealership or repair shop.

9. Can a faulty accessory indicator control module cause other electrical issues in my Chevrolet?

- While a faulty control module primarily affects the accessory indicator function, it is possible for it to cause other minor electrical issues. It's best to address the problem promptly.

10. Is OBDII code B0978 specific to Chevrolet vehicles, or can it occur in other car makes and models?

- This OBDII code is specific to Chevrolet vehicles, as it relates to the Accessory Indicator Control Circuit in Chevrolet's electrical systems. Other car makes and models may have different codes for similar issues.