The C0281 code is a GM diagnostic trouble code (DTC) that indicates an issue with the brake switch circuit.
When the engine control module (ECM) detects that the brake switch circuit is open or shorted, it will store the C0281 code and turn on the ABS light.
This can happen for a variety of reasons, including a malfunctioning brake switch or a problem with the wiring or connections in the brake switch circuit.
Causes of the C0281 Code
There are a few common causes of the C0281 Chevy code. Some of the most likely include:
- A malfunctioning brake switch: The brake switch is responsible for sending a signal to the ECM when the brake pedal is pressed. If the brake switch is not working properly, it can cause the ECM to detect an open or shorted circuit, resulting in the C0281 code.
- Wiring or connections issues in the brake switch circuit: The brake switch circuit includes a number of wires and connections that can become corroded or damaged over time. If there is a problem with any of these components, it can cause the ECM to detect an open or shorted circuit and store the C0281 code.
- Malfunctioning brake light switch: The brake light switch is responsible for turning the brake lights on when the brake pedal is depressed, if this switch is malfunctioning it can also trigger the C0281 code.
Symptoms of the C0281 Code
When the C0281 code is stored, the ABS light will come on. You may also experience other symptoms, depending on the cause of the code. Some common symptoms include:
Brake warning light: If the brake switch is malfunctioning, the brake warning light may come on when the brake pedal is pressed.
Reduced braking performance: If there is a problem with the brake switch circuit, it can cause reduced braking performance, which can make the vehicle difficult to stop.
ABS and Traction Control system error: C0281 code can affect the ABS and Traction Control system, and if the ABS light comes on, it may indicate that the ABS system is not working properly, this can be caused by the brake switch circuit being open or shorted, which can cause the ECM to detect an open or shorted circuit.
How to diagnose and fix C0281 code
Diagnosing and fixing the C0281 code can be a bit tricky, as it can be caused by a variety of different issues. Some steps you can take to diagnose and fix the code include:
Checking the brake switch: The first step in diagnosing the C0281 code is to check the brake switch. You can do this by using a multimeter to test the continuity of the brake switch. If the switch is not working properly, it will need to be replaced.