ABS Hydraulic Pressure Differential Switch Input Short Circuit To Battery

Where it lives

For C1240, the circuit described runs through the switch. The description of C1240 reports the switch as shorted.

Check these first

• A short to battery voltage in the ABS hydraulic pressure differential switch circuit
• A failed ABS hydraulic pressure differential switch
• A poor electrical connection at the pressure differential switch
• A failed anti-lock brake system module

What to do next

1. Read the pressure differential switch status on a scan tool
2. Inspect the pressure differential switch connector and wiring
3. Test the pressure differential switch circuit for a short to battery voltage
4. Compare the switch reading against a known value
5. Replace the ABS hydraulic pressure differential switch if the circuit tests good
6. Clear the code and retest

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