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C0655 Cadillac Code - Level Control Compressor Relay Malfunction

Quick Answer

The C0655 diagnostic trouble code (DTC) for Cadillac vehicles indicates a malfunction in the level control compressor relay. Common causes include Faulty relay: The level control compressor relay itself may be defective or failing, Wiring issues: Problems with the wiring harness or connections related to the compressor relay can cause malfunctions, Air suspension system fault: Underlying issues with the air suspension system, such as leaks or sensor failures, can trigger the relay malfunction. 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
C0655 Cadillac indicates Level Control Compressor Relay Malfunction.
Common causes
Common causes include Faulty relay: The level control compressor relay itself may be defective or failing, Wiring issues: Problems with the wiring harness or connections related to the compressor relay can cause malfunctions, Air suspension system fault: Underlying issues with the air suspension system, such as leaks or sensor failures, can trigger the relay malfunction.
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.
What is this?
Table of contents Created and updated by William Orellana on Aug 30, 2024
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Code C0655 Cadillac Description

The C0655 diagnostic trouble code (DTC) for Cadillac vehicles indicates a malfunction in the level control compressor relay. This component is responsible for controlling the operation of the air suspension system, which helps maintain the vehicle's ride height and stability. When the relay malfunctions, it can lead to issues with the air suspension system, causing uneven ride height, poor handling, and potential safety concerns.

OBDII Code C0655 Cadillac - Level Control Compressor Relay Malfunction
C0655 Cadillac Code - Level Control Compressor Relay Malfunction

Common Causes of C0655 Cadillac

  1. Faulty relay: The level control compressor relay itself may be defective or failing.
  2. Wiring issues: Problems with the wiring harness or connections related to the compressor relay can cause malfunctions.
  3. Air suspension system fault: Underlying issues with the air suspension system, such as leaks or sensor failures, can trigger the relay malfunction.
  4. Corrosion or moisture: Exposure to moisture or corrosion can affect the relay's performance.
  5. Electrical problems: Issues with the vehicle's electrical system, such as voltage irregularities or grounding problems, can impact the relay's operation.

Symptoms of C0655 Cadillac

  1. Uneven ride height: The vehicle may sit lower on one side than the other, affecting the overall balance and stability.
  2. Harsh or bumpy ride: The air suspension system may fail to properly adjust, leading to a rougher ride quality.
  3. Warning light on dashboard: The vehicle's warning light for the suspension system may illuminate, indicating a problem.
  4. Compressor running excessively: The air suspension compressor may run more frequently or for longer periods than usual.
  5. Handling issues: The vehicle may exhibit poor handling characteristics, such as increased body roll or instability during cornering.

How to Fix C0655 Cadillac

  1. Diagnose the issue: Use a diagnostic tool to retrieve the specific trouble code and pinpoint the source of the problem.
  2. Inspect the relay: Check the level control compressor relay for signs of damage or malfunction.
  3. Test the wiring: Inspect the wiring and connections related to the relay to ensure they are intact and functioning properly.
  4. Replace the relay: If the relay is determined to be faulty, replace it with a new, compatible unit.
  5. Clear the code: After completing the repair, clear the trouble code from the vehicle's system to reset the warning light and ensure proper operation.

Cost to Fix C0655 Cadillac

The cost of repairing a level control compressor relay malfunction can vary depending on the specific issue and the vehicle's make and model. In general, the parts cost for a new relay can range from $50 to $150, while labor costs may range from $100 to $200. Overall, the total repair cost could be anywhere from $150 to $350, including parts and labor. It's important to keep in mind that prices can vary based on location and the specific repair shop, so it's recommended to obtain a detailed estimate from a trusted mechanic before proceeding with the repair.

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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 C0655 Cadillac Code

1. What are the common symptoms of OBDII code C0655 in a Cadillac related to the Level Control Compressor Relay Malfunction?

Common symptoms include issues with the automatic leveling system, uneven ride height, abnormal compressor operation, and dashboard warning lights.

2. What could cause the Level Control Compressor Relay Malfunction in a Cadillac triggering OBDII code C0655?

Potential causes may include a faulty compressor relay, wiring issues, a malfunctioning compressor, a failed compressor control module, or problems with the level control sensor.

3. How serious is the OBDII code C0655 indicating a Level Control Compressor Relay Malfunction in a Cadillac?

While the vehicle may still be drivable, ignoring this issue can lead to an uncomfortable ride, poor handling, and potential damage to other suspension components over time.

4. Can I continue driving my Cadillac with the OBDII code C0655 related to the Level Control Compressor Relay Malfunction?

It is generally not recommended to drive the vehicle for an extended period with this issue unresolved, as it can affect the overall performance and safety of the vehicle.

5. How can I diagnose the Level Control Compressor Relay Malfunction causing OBDII code C0655 in my Cadillac?

Diagnosis typically involves checking the compressor relay, inspecting the wiring and connections, testing the compressor and control module, and verifying the operation of the level control system.

6. What are some repair tips for fixing the Level Control Compressor Relay Malfunction triggering OBDII code C0655 in a Cadillac?

Repair tips may include replacing the faulty compressor relay, repairing damaged wiring, testing and potentially replacing the compressor or control module, and resetting the system after repairs are made.

7. Is it possible to reset the OBDII code C0655 related to the Level Control Compressor Relay Malfunction in a Cadillac without fixing the underlying issue?

Resetting the code without addressing the root cause may temporarily turn off the warning light, but the issue will likely persist and trigger the code again in the future.

8. Can a DIY enthusiast fix the Level Control Compressor Relay Malfunction causing OBDII code C0655 in a Cadillac?

Depending on the individual's mechanical skills and access to tools, some DIY enthusiasts may be able to diagnose and repair this issue. However, it is recommended to consult a professional if unsure.

9. How much does it typically cost to repair the Level Control Compressor Relay Malfunction leading to OBDII code C0655 in a Cadillac?

The cost of repairs can vary depending on the exact cause of the issue, but it may involve expenses for parts, labor, diagnostic fees, and any additional components that need replacement.

10. How can regular maintenance help prevent the occurrence of OBDII code C0655 related to the Level Control Compressor Relay Malfunction in a Cadillac?

Regularly inspecting and servicing the suspension system, checking the compressor and related components, and addressing any warning signs promptly can help prevent this issue and ensure optimal vehicle performance.

Discuss the causes and fixes for C0655 Cadillac OBDII Code

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  • My Cadillac escalade 2006 don't shift to gear 3 and 4, what could be the cause?despite the fact that I have changed the transmission fluids, serviced the filter, what else can I do?

    Reply to Comment

  • Do you have any other codes besides the C0655 code? The C0655 code has nothing to do with the transmission shifting problems.
    With more codes you can get a better idea what the problem is. Without codes and only with the symptoms you have, a transmission shop needs to perform some testing to find out what the problem is.

    Reply to Comment