AutoCodes – GMC – P1248 2018 GMC Sierra

P1248 2018 GMC Sierra Code - Injector 1 Positive Voltage Control Circuit Shorted to Control Circuit

Quick Answer

The Engine Control Module (ECM) supplies voltage to each fuel injector on the injector high voltage supply circuits. Common causes include Faulty Fuel Injector 1, Fuel Injector 1 harness is open or shorted, Fuel Injector 1 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: P1248 2018 GMC Sierra indicates Injector 1 Positive Voltage Control Circuit Shorted to Control Circuit.
Common causes: Common causes include Faulty Fuel Injector 1, Fuel Injector 1 harness is open or shorted, Fuel Injector 1 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 198

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Aug 12, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1248 2018 GMC Sierra Description

The Engine Control Module (ECM) supplies voltage to each fuel injector on the injector high voltage supply circuits. The ECM energizes each fuel injector by grounding the high voltage control circuit of the fuel injector. The ECM monitors the status of the injector high voltage supply circuits and the fuel injector high voltage control circuits. When a fuel injector circuit condition is detected by the ECM, the affected fuel injector(s) is disabled. The Diagnostic Trouble Code (DTC) will be set if the ECM detects the injector high control circuit is shorted to the low control circuit for greater than 2 s.

OBDII Code P1248 2018 GMC Sierra - Injector 1 Positive Voltage Control Circuit Shorted to Control Circuit - AutoCodes.com — P1248 2018 GMC Sierra Code - Injector 1 Positive Voltage Control Circuit Shorted to Control Circuit

What does this mean?

What are the Possible Causes of the DTC P1248 2018 GMC Sierra?

Faulty Fuel Injector 1
Fuel Injector 1 harness is open or shorted
Fuel Injector 1 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P1248 2018 GMC Sierra?

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 P1248 2018 GMC Sierra 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.

Need more information about the P1248 2018 GMC Sierra code?

Need more information on how to fix the P1248 2018 GMC Sierra code? Get Access to Factory Service Manuals

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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 P1248 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code P1248 in a 2018 GMC Sierra?

The common symptoms of code P1248 in a 2018 GMC Sierra may include rough idling, engine misfires, decreased fuel efficiency, and illuminated Check Engine Light.

2. What does the OBDII code P1248 for a 2018 GMC Sierra mean?

OBDII code P1248 for a 2018 GMC Sierra indicates that Injector 1 Positive Voltage Control Circuit is shorted to the Control Circuit.

3. What are the possible causes of OBDII code P1248 in a 2018 GMC Sierra?

Possible causes of code P1248 in a 2018 GMC Sierra include damaged wiring or connectors, a faulty fuel injector, issues with the Engine Control Module (ECM), or a short circuit in the control circuit.

4. How can I diagnose OBDII code P1248 in my 2018 GMC Sierra?

Diagnosing code P1248 involves inspecting the wiring and connectors associated with Injector 1, testing the fuel injector for proper operation, and using a multimeter to check for continuity and shorts in the control circuit.

5. Can I continue driving my 2018 GMC Sierra with OBDII code P1248?

It is not recommended to continue driving your 2018 GMC Sierra with code P1248 present, as it can lead to further damage to the engine or emissions system. It's best to address the issue promptly.

6. How can I repair OBDII code P1248 in my 2018 GMC Sierra?

Repairing code P1248 may involve repairing or replacing damaged wiring, connectors, or the fuel injector, as well as addressing any issues with the Engine Control Module. It's recommended to consult a professional mechanic for accurate diagnosis and repair.

7. Is it safe to reset the Check Engine Light after fixing OBDII code P1248 in my 2018 GMC Sierra?

Yes, it is safe to reset the Check Engine Light after fixing code P1248 in your 2018 GMC Sierra. If the issue has been properly addressed, the light should not come back on.

8. How much does it cost to repair OBDII code P1248 in a 2018 GMC Sierra?

The cost of repairing code P1248 in a 2018 GMC Sierra can vary depending on the exact cause of the issue, the needed parts, and labor costs. It's advisable to get a few quotes from reputable mechanics for an accurate estimate.

9. Can a DIY enthusiast fix OBDII code P1248 in a 2018 GMC Sierra?

While some aspects of diagnosing and repairing code P1248 may be within the realm of a DIY enthusiast, it's recommended to consult a professional mechanic for accurate diagnosis and repair to ensure the issue is properly resolved.

10. How often does OBDII code P1248 occur in a 2018 GMC Sierra?

The occurrence of OBDII code P1248 in a 2018 GMC Sierra can vary depending on the vehicle's maintenance history, driving conditions, and other factors. If the issue arises, it should be addressed promptly to prevent further complications.