AutoCodes – Chevrolet – B0985 Chevrolet

B0985 Chevrolet Code - Right Headlamp Light Distribution Shutter Control Circuit Malfunction

Quick Answer

Battery positive voltage is applied to the headlamp control module at all times. Common causes include Faulty Right Headlamp Assembly, Right Headlamp Assembly harness is open or shorted, Right Headlamp Assembly 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: B0985 Chevrolet indicates Right Headlamp Light Distribution Shutter Control Circuit Malfunction.
Common causes: Common causes include Faulty Right Headlamp Assembly, Right Headlamp Assembly harness is open or shorted, Right Headlamp Assembly 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 1,218

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 B0985 Chevrolet Description

Battery positive voltage is applied to the headlamp control module at all times. The headlamp control module has a normal operational voltage range of about 12.5-16 V and is only fully functional with the ignition switch is in the RUN position and the headlamp switch in the AUTO position. The communications enable signal from the Body Control Module (BCM) wakes the headlamp control module microprocessor. The headlamp control module receives serial data messages from the Engine Control Module (ECM), Transmission Control Module (TCM), Electronic Brake Control Module (EBCM), and BCM with information regarding power mode, speed, steering angle, transmission gear selection, and headlamp switch status. The headlamp control module calculates the headlamp angle and sends commands to the left and right adaptive forward lighting system headlamp actuators. The headlamp actuators drive the headlamps to the position commanded by the headlamp control module. The headlamp control module monitors the headlamp actuator motor control circuits for proper circuit continuity and for shorts to ground or voltage. If a malfunction is detected, a DTC will be stored in memory and the driver will be notified with a message displayed over the driver information center located on the instrument cluster.

OBDII Code B0985 Chevrolet - Right Headlamp Light Distribution Shutter Control Circuit Malfunction - AutoCodes.com — B0985 Chevrolet Code - Right Headlamp Light Distribution Shutter Control Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC B0985 Chevrolet?

Faulty Right Headlamp Assembly
Right Headlamp Assembly harness is open or shorted
Right Headlamp Assembly circuit poor electrical connection

How to Fix the DTC B0985 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 B0985 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 B0985 Chevrolet Code

1. What does the OBDII code B0985 mean for a Chevrolet?

The code B0985 indicates a malfunction in the right headlamp light distribution shutter control circuit, which affects the adaptive or high-beam lighting system.

2. What are the common symptoms of the B0985 code?

Symptoms include the right headlamp not adjusting properly, failure of the adaptive lighting system, or the high/low beam not functioning as expected.

3. What causes the B0985 code to appear?

Common causes include a faulty light distribution shutter motor, damaged wiring or connectors in the circuit, or a malfunctioning headlamp control module.

4. Can I still drive my Chevrolet with the B0985 code?

Yes, you can still drive the vehicle, but the headlamp may not function optimally, reducing visibility at night or in adverse weather conditions.

5. How do you diagnose the B0985 code?

Diagnosis involves using a scan tool to confirm the code, visually inspecting the wiring and connectors for damage, and testing the shutter motor and control module for proper operation.

6. How can the B0985 code be fixed?

Repairs may include replacing the shutter motor, repairing damaged wiring or connectors, or reprogramming or replacing the headlamp control module.

7. Is the B0985 code specific to Chevrolet vehicles?

While the code is commonly associated with Chevrolet vehicles, similar codes may appear in other brands with adaptive lighting systems.

8. How much does it cost to fix the B0985 code?

Repair costs vary depending on the exact issue but can range from $100 for simple wiring repairs to $500 or more for replacing the shutter motor or control module.

9. Can a weak battery cause the B0985 code?

Yes, a weak or failing battery can cause voltage issues that may trigger the B0985 code by affecting the headlamp systemâ€™s electrical components.

10. Do I need professional help to fix the B0985 code?

While basic troubleshooting like checking fuses and connectors can be done at home, resolving deeper issues often requires professional tools and expertise.