AutoCodes – GMC – B2585 GMC

B2585 GMC Code - Park Lamp Control Circuit

Quick Answer

When the Body Control Module (BCM) receives a ground signal from the headlamp switch commanding to illuminate the park lamps, the BCM will energize the park lamp relay by grounding the park lamp relay control circuit. Common causes include Faulty Park Lamp Relay, Park Lamp Relay harness is open or shorted, Park Lamp Relay 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: B2585 GMC indicates Park Lamp Control Circuit.
Common causes: Common causes include Faulty Park Lamp Relay, Park Lamp Relay harness is open or shorted, Park Lamp Relay 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 2,911

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 Dec 29, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2585 GMC Description

When the Body Control Module (BCM) receives a ground signal from the headlamp switch commanding to illuminate the park lamps, the BCM will energize the park lamp relay by grounding the park lamp relay control circuit. The Diagnostic Trouble Code (DTC) sets when the park lamp relay control circuit is open or shorted to ground.

OBDII Code B2585 GMC - Park Lamp Control Circuit - AutoCodes.com — B2585 GMC Code - Park Lamp Control Circuit

What does this mean?

What are the Possible Causes of the DTC B2585 GMC?

Faulty Park Lamp Relay
Park Lamp Relay harness is open or shorted
Park Lamp Relay circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B2585 GMC?

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 B2585 GMC 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 B2585 GMC Code

1. What are the common symptoms of OBDII code B2585 GMC related to the Park Lamp Control Circuit?

The common symptoms include malfunctioning park lamps or parking lights that do not illuminate properly.

2. What are the possible causes of OBDII code B2585 GMC?

Possible causes include a faulty park lamp control module, wiring issues, blown fuses, or a malfunctioning park lamp switch.

3. How can I diagnose the cause of OBDII code B2585 GMC?

Diagnosing the issue involves checking the park lamp control module, inspecting the wiring for damage or loose connections, testing the fuses, and verifying the operation of the park lamp switch.

4. How can I repair OBDII code B2585 GMC related to the Park Lamp Control Circuit?

Repairing the issue may involve replacing the park lamp control module, repairing or replacing damaged wiring, replacing blown fuses, or fixing the park lamp switch if necessary.

5. Can OBDII code B2585 GMC be triggered by a simple bulb failure?

Yes, a malfunctioning park lamp bulb can also trigger OBDII code B2585 GMC, so it's recommended to check and replace any faulty bulbs if needed.

6. Is it safe to continue driving with OBDII code B2585 GMC active?

While the vehicle may still be operable with this code, it is not recommended to ignore the issue as malfunctioning park lamps can impact visibility and safety, especially in low-light conditions.

7. Will resetting the OBDII code B2585 GMC make the problem go away permanently?

Resetting the code may temporarily turn off the warning light, but if the underlying issue causing the code is not addressed, it is likely to reappear once the problem is detected again.

8. Can weather conditions affect the Park Lamp Control Circuit and trigger OBDII code B2585 GMC?

Extreme weather conditions, moisture, or water ingress can potentially impact the park lamp control circuit, leading to issues that trigger OBDII code B2585 GMC.

9. How do I prevent OBDII code B2585 GMC from recurring in the future?

To prevent the code from recurring, it's important to perform regular maintenance checks on the park lamp system, ensure all bulbs are in good condition, and address any wiring or module issues promptly.

10. Is it necessary to visit a mechanic for OBDII code B2585 GMC diagnosis and repair, or can I fix it myself?

Depending on your automotive knowledge and skills, you may attempt to diagnose and repair the issue yourself. However, if you are unsure or if the problem persists, seeking assistance from a qualified mechanic is advisable.