ABS Hydraulic Pressure Differential Switch Input Open Circuit

Where it lives

For C1239, the circuit described runs through the switch. The description of C1239 reports the switch as open.

Check these first

• An open 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 an open
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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