Caterpillar C9 Error Codes 00 246-11 and 00 247-11: Brake Pedal Switch Faults and Solutions

This guide provides solutions for addressing Caterpillar C9 error codes 00 246-11 and 00 247-11, which relate to brake pedal switch malfunctions.

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Brake Pedal Switch #1 Fault: 00 246-11

Condition:
The engine is running, and the following contradictory statuses are detected:

• Switch 1: Indicates the brake pedal is pressed.
• Switch 2: Indicates the brake pedal is released.

How It Works:

• The Service Brake Pedal Position Switch 1 is a push switch.
• Normally, this switch closes when the pedal is released and opens when the pedal is pressed.
• This switch is typically supplied by the Original Equipment Manufacturer (OEM).

Possible Causes:

1. ECM connector or wiring harness issues.
2. Faulty service brake pedal position sensor.
3. Damaged or disconnected wiring between the sensor and ECM.
4. ECM malfunction.

Brake Pedal Switch #2 Fault: 00 247-11

Condition:
The engine is running, and the following contradictory statuses are detected:

• Switch 2: Indicates the brake pedal is pressed.
• Switch 1: Indicates the brake pedal is released.

How It Works:

• The Service Brake Pedal Position Switch 2 operates similarly to Switch 1.
• This push switch closes when the pedal is released and opens when the pedal is pressed.
• It is also supplied by the OEM.

Possible Causes:

1. ECM connector or wiring harness issues.
2. Faulty service brake pedal position sensor.
3. Damaged or disconnected wiring between the sensor and ECM.
4. ECM malfunction.

Steps to Diagnose and Resolve:

1. Inspect the Wiring and Connectors:
   • Check the ECM connectors and harness for loose connections, corrosion, or damage.
   • Ensure the wiring between the ECM and brake pedal switches is intact and free from shorts or breaks.
2. Test the Brake Pedal Position Switches:
   • Use a multimeter to verify that both switches function as expected (close when released and open when pressed).
   • Replace the faulty switch if needed.
3. Check ECM Operation:
   • If the wiring and switches are confirmed functional, inspect the ECM for errors or internal faults.
   • Reprogram or replace the ECM if necessary.
4. Consult OEM Documentation:
   • Refer to the service manual specific to your equipment for detailed diagnostic steps and replacement procedures.

More repair case for Caterpillar machine,please refer to:Caterpillar Machine Repair