AutoCodes – Generic – C0657

C0657 Code - Level Control Compressor Circuit Low

Quick Answer

The Automatic Level Control compressor is switched ON and OFF using an Electronic Level Control (ELC) compressor relay which is controlled by the Electronic Suspension Control (ESC) module. Common causes include Faulty Level Control Compressor, Level Control Compressor harness is open or shorted, Level Control Compressor 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: C0657 indicates Level Control Compressor Circuit Low.
Common causes: Common causes include Faulty Level Control Compressor, Level Control Compressor harness is open or shorted, Level Control Compressor 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 1,037

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 Jul 31, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C0657 Description

The Automatic Level Control compressor is switched ON and OFF using an Electronic Level Control (ELC) compressor relay which is controlled by the Electronic Suspension Control (ESC) module. The ESC module circuitry provides a switched path to ground whenever compressor activity is required. This drive circuit is also continually monitored to determine if the voltage level agrees with the commanded state.

OBDII Code C0657 - Level Control Compressor Circuit Low - AutoCodes.com — C0657 Code - Level Control Compressor Circuit Low

What does this mean?

What are the Possible Causes of the DTC C0657?

Faulty Level Control Compressor
Level Control Compressor harness is open or shorted
Level Control Compressor circuit poor electrical connection

How to Fix the DTC C0657?

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 C0657 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 C0657 code?

Need more information on how to fix the C0657 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C0657 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C0657 Buick — Level Control Compressor Circuit Low
C0657 Cadillac — Level Control Compressor Circuit Low
C0657 Chevrolet — Level Control Compressor Circuit Low
C0657 GMC — Level Control Compressor Circuit Low

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 C0657 Code

1. What does the OBDII code C0657 mean?

The C0657 code indicates that the level control compressor circuit is experiencing low voltage or insufficient power, which can affect the vehicle's air suspension system.

2. What are the common symptoms of the C0657 code?

Symptoms may include a sagging or uneven suspension, a warning light on the dashboard, a noisy or non-functioning compressor, or a rough ride quality.

3. What causes the C0657 code to be triggered?

This code is typically caused by a faulty air suspension compressor, damaged wiring or connectors in the compressor circuit, a blown fuse, or a failing control module.

4. Can I still drive my vehicle with the C0657 code?

Yes, but driving with this code may result in poor ride quality, uneven suspension, or damage to other suspension components over time.

5. How is the C0657 code diagnosed?

A mechanic will use a scan tool to retrieve the code, inspect the compressor and its wiring, check for blown fuses, and test the circuit for proper voltage.

6. What should I check first when troubleshooting the C0657 code?

Start by inspecting the air suspension compressor's fuse and wiring for damage or corrosion, as these are common causes of this issue.

7. How can I fix the C0657 code?

Repairs may include replacing the air suspension compressor, repairing or replacing damaged wiring, cleaning corroded connectors, or replacing a blown fuse.

8. How much does it cost to repair the C0657 code?

Repair costs can vary but typically range from $200 to $1,500, depending on whether the compressor, wiring, or control module needs replacement.

9. Can a weak battery cause the C0657 code?

Yes, a weak or failing battery can reduce voltage to the compressor circuit, potentially triggering the C0657 code.

10. How can I prevent the C0657 code from recurring?

Regularly inspect and maintain the air suspension system, including checking the compressor, wiring, and fuses, and promptly address any warning signs of failure.