P1189 Pump Speed Signal Fault (Diesel)
What does P1189 mean on a Ford?
P1189 — Pump Speed Signal Fault (Diesel). This Ford-enhanced code applies to Ford diesel models with electronic injection control.
Common causes of P1189
- Failed pump speed sensor
- Damaged speed signal wiring
- Excessive sensor air gap
- Metal debris on the sensor tip
- Controller input fault
How to fix P1189
- Inspect the sensor tip for debris
- Check the air gap to spec
- Test signal output during crank
- Verify wiring continuity
- Replace the sensor if no signal is present