AutoCodes – GMC – C0585 2018 GMC Sierra

C0585 2018 GMC Sierra Code - Left Rear Shock Absorber Actuator Circuit

Quick Answer

The Suspension Control Module commands variable levels of current to each shock absorber actuator in response to rough road, braking, or abrupt steering maneuver driving conditions. Common causes include Faulty Left Rear Shock Absorber Actuator, Left Rear Shock Absorber Actuator harness is open or shorted, Left Rear Shock Absorber Actuator 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
C0585 2018 GMC Sierra indicates Left Rear Shock Absorber Actuator Circuit.
Common causes
Common causes include Faulty Left Rear Shock Absorber Actuator, Left Rear Shock Absorber Actuator harness is open or shorted, Left Rear Shock Absorber Actuator 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 204
How popular is this code, among other codes? Low
Table of contents Created and updated by William Orellana on Jul 16, 2023
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Code C0585 2018 GMC Sierra Description

The Suspension Control Module commands variable levels of current to each shock absorber actuator in response to rough road, braking, or abrupt steering maneuver driving conditions. The current variation is performed by pulse width modulation (PWM) of the system voltage. The Suspension Control Module continuously measures the actual current of each actuator. When a deviation between commanded and actual current is detected, a Diagnostic Trouble Code (DTC) is set.
OBDII Code C0585 2018 GMC Sierra - Left Rear Shock Absorber Actuator Circuit - AutoCodes.com
C0585 2018 GMC Sierra Code - Left Rear Shock Absorber Actuator Circuit

What are the Possible Causes of the DTC C0585 2018 GMC Sierra?

  • Faulty Left Rear Shock Absorber Actuator
  • Left Rear Shock Absorber Actuator harness is open or shorted
  • Left Rear Shock Absorber Actuator circuit poor electrical connection
  • Faulty Suspension Control Module

How to Fix the DTC C0585 2018 GMC Sierra?

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.

Code Tech Notes

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C0585 2018 GMC Sierra 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 C0585 2018 GMC Sierra code?

Need more information on how to fix the C0585 2018 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 C0585 2018 GMC Sierra Code

1. What does the OBDII code C0585 mean on a 2018 GMC Sierra?

The C0585 code indicates a problem with the Left Rear Shock Absorber Actuator Circuit in the Sierra's suspension system.

2. What are the common symptoms of a C0585 code?

Symptoms may include a rough ride, reduced suspension performance, warning lights on the dashboard, or a Service Suspension System message.

3. What causes the C0585 code to be triggered?

Common causes include a faulty shock absorber actuator, damaged wiring or connectors in the circuit, or a malfunctioning suspension control module.

4. How do I diagnose the C0585 code?

Start by inspecting the left rear shock absorber actuator, checking for damaged wiring or loose connections. Use a scan tool to test the actuator and related circuits.

5. Can I keep driving with the C0585 code active?

While the vehicle might still be drivable, the suspension may not perform optimally, leading to a less comfortable or stable ride. Prompt repair is recommended.

6. How do I fix the C0585 code on a 2018 GMC Sierra?

Repairs may involve replacing the left rear shock absorber actuator, repairing damaged wiring, or reprogramming/resetting the suspension control module.

7. How much does it cost to repair a C0585 code?

Repair costs can vary, but replacing the shock absorber actuator typically ranges from $200 to $500, depending on labor and parts.

8. Can a bad suspension control module cause the C0585 code?

Yes, a malfunctioning suspension control module can send incorrect signals or fail to communicate with the actuator, triggering this code.

9. Is the C0585 code specific to the left rear shock absorber?

Yes, the C0585 code specifically refers to an issue in the Left Rear Shock Absorber Actuator Circuit.

10. Can I clear the C0585 code without fixing the problem?

You can clear the code with a scan tool, but it will likely return if the underlying issue is not resolved.

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