AutoCodes – GMC – C0657 GMC

C0657 GMC 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 GMC 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 891

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

What does this mean?

What are the Possible Causes of the DTC C0657 GMC?

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 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 C0657 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 C0657 GMC Code

1. What are the common symptoms of OBDII code C0657 GMC (Level Control Compressor Circuit Low)?

- The common symptoms include a malfunctioning or noisy suspension system, uneven ride height, and the suspension failing to adjust properly.

2. What are the possible causes of OBDII code C0657 GMC?

- The code C0657 can be triggered by issues such as a faulty level control compressor, damaged wiring or connectors in the compressor circuit, or a malfunctioning compressor relay.

3. How can I diagnose the cause of OBDII code C0657 GMC?

- To diagnose the issue, you can start by checking the compressor relay, inspecting the wiring and connectors in the compressor circuit, and testing the level control compressor for proper functionality.

4. Can a DIY enthusiast repair OBDII code C0657 GMC at home?

- Repairing OBDII code C0657 may require advanced automotive knowledge and specialized tools. It is recommended to consult a professional mechanic for accurate diagnosis and repair.

5. Is it safe to drive with OBDII code C0657 GMC active?

- Driving with a level control compressor circuit low code may result in an uncomfortable ride, poor handling, and potential damage to the suspension system. It is advisable to address the issue promptly.

6. How much does it typically cost to repair OBDII code C0657 GMC?

- The cost of repairing OBDII code C0657 can vary depending on the underlying cause of the issue, parts needed for replacement, and labor costs. It is best to obtain quotes from local mechanics or repair shops.

7. Can resetting the OBDII code C0657 GMC solve the issue temporarily?

- Resetting the code may temporarily clear the warning light, but it will not fix the underlying problem causing the code to trigger. It is crucial to diagnose and address the root cause of the issue.

8. Are there any preventive maintenance tips to avoid OBDII code C0657 GMC in the future?

- To prevent OBDII code C0657, it is essential to regularly inspect and maintain the suspension system, including checking for leaks, ensuring proper compressor operation, and addressing any issues promptly.

9. Will OBDII code C0657 GMC affect the vehicle's overall performance?

- OBDII code C0657 may lead to compromised ride quality, handling issues, and potential suspension damage if left unaddressed. It is advisable to resolve the code to maintain the vehicle's performance.

10. Can extreme weather conditions cause OBDII code C0657 GMC to trigger?

- Extreme weather conditions, such as excessive heat or cold, can potentially impact the level control compressor's performance and trigger OBDII code C0657. Regular maintenance can help mitigate such issues.