Ignition Supply Malfunction
Table of contents
P1793 Possible Causes
- Faulty Ignition Switch Position Run (ISP-R)
- ISP-R harness is open or shorted
- ISP-R circuit poor electrical connection
- Low battery charge
How do I fix code P1793?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Cost of diagnosing the P1793 code
The cost of diagnosing the P1793 code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P1793 Description
The powertrain control module (PCM) monitors the Ignition Switch Position Run (ISP-R) circuit. This DTC sets if the voltage drops below 7 volts or rises above 16 volts.