Engine-Codes - Generic - P1793

P1793 Code - Ignition Supply Malfunction

- Code Popularity: 26,852 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 2/3
Table of contents
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What are the Possible Causes of the DTC P1793?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty Ignition Switch Position Run (ISP-R)
  • ISP-R harness is open or shorted
  • ISP-R circuit poor electrical connection
  • Low battery charge
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How to Fix the DTC 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 pins.

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What is the Cost to Diagnose the Code?

Labor: 1.0

The cost to diagnose the P1793 code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

What Does the P1793 Code Mean?

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.

P1793 Code - Ignition Supply Malfunction

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Code P1793 Information for Specific Makes

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