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C1100

ABS Pump Switch Circuit Failure

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By
KBB Service Advisor
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Reviewed by
Gary Hardesty

What Is the C1100 Code?

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When a professional is inspecting your car and sees error code C1100, it means your car’s ECU or Engine Control Unit has detected an unknown circuit failure within the ABS or Anti-Lock Braking System’s pump switch circuit. This indicates that your ABS may not work as intended, which could be dangerous.

Your vehicle’s ABS provides additional traction as needed. If the ABS pump no longer works as it should, the ECU will perform a diagnostic test. This test will verify if the parameters for error code C1100 are met. If a C1100 error code has occurred, this indicates that your pump switch circuit has failed. This will disable the proper function of your vehicle’s ABS. Without a proper pump, there will be no pressure.

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What Are the Symptoms of a C1100 Code?

If a C1100 code is detected, it means that your car’s Anti-Lock Braking System will either be hindered or completely disabled. Along with practical concerns, the code is often accompanied by your check engine light coming on. Aside from that, there are no standout symptoms of this particular error code.

Many people may consider this specific code inaccurate because their brakes still operate within normal parameters. What they don’t realize is that a C1100 code doesn’t pertain to regular braking. Drivers will only notice a difference with their brakes if they find themselves in a situation where the ABS would normally be triggered.

Code C1100 can also cause your vehicle to handle differently due to insufficient traction. Due to the fact that the ABS is no longer working, it is recommended that you take your car to a professional mechanic as soon as possible to have the problem resolved.

What Are Some Causes of a C1100 Code?

There are several things that could trigger the C1100 error message. However, the main cause would be that your ABS pump has stopped working. You could also have a failed sensor or faulty control unit. If multiple ABS circuit failures occur, the good news is that this problem is often solved simply by replacing one sensor.

The C1100 error code can also be triggered due to issues with your electrical connectors or wiring. If the wires are damaged or corroded, it can cause issues with your circuit, triggering the error code. However, that is a rare issue that should only be considered if all other causes have been checked and cleared.

How Serious Is the C1100 Code?

Without proper ABS traction, your vehicle will handle it differently. Although it may still be drivable without the ABS, it can greatly increase your risk of an accident. A C1100 error code is typically more serious if your vehicle is driven on rocky or bumpy terrain or in severe driving conditions. If you live and find yourself driving in areas where you need to repetitively hit the brakes, a C1100 code is a catalyst for disaster. If a mechanic discovers a C1100 code, it should be fixed before going back to driving.

Can I Still Drive with a C1100 Code?

The benefits of Anti-Locking Brakes wouldn’t be present; however, the vehicle’s conventional brakes will still be functional. We recommend seeking professional assistance.

 

How Easy Is It to Diagnose a C1100 Code?

A C1100 code can be easy to misdiagnose or misinterpret. A mechanic will not only scan the vehicle with an OBD-II scanner but will determine what the code is precisely attempting to indicate. All Chassis or C-class error codes could indicate a variety of issues depending on the vehicle’s make and model, such as a Mercedes C1100 code referring to circuit fault issues in your car’s left front axle.

They’ll also check to see if there’s any faulty or damaged wiring or electrical connectors. Your mechanic will then check control units and sensors.

How Difficult Is It to Inspect a C1100 Code?

In order to repair a C1100 error code, a qualified mechanic will start by replacing and fixing any electrical wiring and connectors that are worn or damaged and ensuring they are rewired correctly. In the event that the ECU is faulty, it needs to be replaced or reprogrammed.

Once repairs are complete, a mechanic will restart and rescan your vehicle. If the same error code appears, they will return to the diagnostic stage of repairs and find out if there was anything overlooked. Unless the codes have been cleared, the code will still appear. However, the ABS light may be off because the issue was repaired. If the code doesn’t reappear, your mechanic has fixed the problem and managed to properly clear the code.

Need Additional Help with Your C1100 Code?

If a C1100 code appears during the diagnosis, your mechanic will help you avoid any issues with traction while driving or braking.

C1100 Q&A

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