AutoCodes – Lincoln – P1793 Lincoln

P1793 Lincoln Code - Ignition Supply Malfunction

Quick Answer

The Powertrain Control Module (PCM) monitors the Ignition Switch Position Run (ISP-R) circuit. Common causes include Faulty Ignition Switch Position Run (ISP-R), ISP-R harness is open or shorted, ISP-R circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P1793 Lincoln indicates Ignition Supply Malfunction.
Common causes: Common causes include Faulty Ignition Switch Position Run (ISP-R), ISP-R harness is open or shorted, ISP-R circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 1,613

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 19, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1793 Lincoln 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.

OBDII Code P1793 Lincoln - Ignition Supply Malfunction - AutoCodes.com — P1793 Lincoln Code - Ignition Supply Malfunction

What does this mean?

What are the Possible Causes of the DTC P1793 Lincoln?

Faulty Ignition Switch Position Run (ISP-R)
ISP-R harness is open or shorted
ISP-R circuit poor electrical connection
Low battery charge

How to Fix the DTC P1793 Lincoln?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1793 Lincoln code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1793 Lincoln Code

1. What are common symptoms of OBDII code P1793 in a Lincoln indicating Ignition Supply Malfunction?

- Common symptoms may include issues with starting the vehicle, rough idling, stalling, and poor engine performance.

2. What are the possible causes of OBDII code P1793 in a Lincoln related to Ignition Supply Malfunction?

- The code can be triggered by faults in the ignition switch, faulty wiring or connections, a malfunctioning ignition relay, or issues with the ignition control module.

3. How can I diagnose OBDII code P1793 in a Lincoln for Ignition Supply Malfunction?

- Diagnosis typically involves checking the ignition system components for proper functioning, inspecting wiring for damage, and using a diagnostic scanner to read the code and assess related data.

4. Can a DIY enthusiast repair OBDII code P1793 in a Lincoln for Ignition Supply Malfunction?

- Depending on the root cause, DIY repairs may be possible, such as replacing a faulty ignition switch or fixing a wiring issue. However, complex repairs involving control modules may require professional assistance.

5. What are the recommended steps to repair OBDII code P1793 in a Lincoln due to Ignition Supply Malfunction?

- The repair process may involve identifying the specific faulty component, replacing damaged parts, ensuring proper electrical connections, and clearing the trouble code using a diagnostic tool.

6. Is it safe to continue driving a Lincoln with OBDII code P1793 related to Ignition Supply Malfunction?

- It is not advisable to drive the vehicle with this code present, as it can lead to potential safety hazards or further damage to the vehicle's components. It's best to address the issue promptly.

7. How much does it typically cost to repair OBDII code P1793 in a Lincoln caused by Ignition Supply Malfunction?

- The repair costs can vary based on the exact cause of the issue and whether professional help is required. Costs may include parts, labor, and diagnostic fees, which could range from a few hundred to a few thousand dollars.

8. Are there any preventive measures to avoid OBDII code P1793 in a Lincoln related to Ignition Supply Malfunction?

- Regular maintenance, such as checking the ignition system components, keeping electrical connections clean and secure, and addressing any warning signs promptly, can help prevent such issues.

9. How urgent is it to address OBDII code P1793 in a Lincoln due to Ignition Supply Malfunction?

- It is recommended to address the issue as soon as possible to avoid potential breakdowns or safety hazards while driving. Ignoring the code can lead to more severe problems over time.

10. Can OBDII code P1793 in a Lincoln for Ignition Supply Malfunction affect fuel efficiency?

- Yes, if left unresolved, issues related to the ignition system can lead to poor engine performance, which may impact fuel efficiency negatively. Resolving the code can help maintain optimal fuel economy.