Brake Pressure Sensor K Circuit Low

Where it lives

For C0643, the circuit described runs through the sensor. The description of C0643 reports a fault at the sensor.

Check these first

• A brake pressure sensor K that failed low
• A short to ground in the brake pressure sensor K signal wire
• Corrosion or water in the brake pressure sensor K connector
• A poor ground at brake pressure sensor K
• An ABS module that lost the brake pressure sensor K signal

What to do next

1. Read brake pressure sensor K with a scan tool
2. Test the brake pressure sensor K signal wire for a short to ground
3. Inspect the brake pressure sensor K connector for corrosion or water
4. Check the brake pressure sensor K ground for resistance
5. Replace brake pressure sensor K if the signal stays low
6. Clear the code and retest

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