P1793 Ignition Supply Malfunction
What does P1793 mean on a Ford?
P1793 — Ignition Supply Malfunction. This Ford-enhanced code applies to F-150, Explorer, Ranger, Mustang.
Common causes of P1793
- Blown ignition fuse
- Failing ignition switch
- Corroded supply splices
- Voltage drop in the ignition feed
- Aftermarket devices overloading the circuit
How to fix P1793
- Check ignition fuses under load
- Voltage-drop the ignition feed
- Test ignition switch outputs
- Remove aftermarket loads and retest
- Repair the supply circuit