AutoCodes – GMC – P1248 2017 GMC Sierra

P1248 2017 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 2017 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 200

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 2017 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 2017 GMC Sierra - Injector 1 Positive Voltage Control Circuit Shorted to Control Circuit - AutoCodes.com — P1248 2017 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 2017 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 2017 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 2017 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 2017 GMC Sierra code?

Need more information on how to fix the P1248 2017 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 2017 GMC Sierra Code

1. What does the OBDII code P1248 mean on a 2017 GMC Sierra?

P1248 indicates that the Injector 1 Positive Voltage Control Circuit is shorted to the control circuit, which affects the proper functioning of the fuel injector.

2. What are the common symptoms of code P1248 in a 2017 GMC Sierra?

Symptoms may include rough idling, a misfiring engine, reduced fuel efficiency, poor acceleration, and the check engine light being illuminated.

3. What causes the P1248 code in a 2017 GMC Sierra?

Common causes include damaged or corroded wiring, a short circuit in the injector circuit, a faulty fuel injector, or a malfunctioning engine control module (ECM).

4. Can a bad fuel injector cause the P1248 code on a 2017 GMC Sierra?

Yes, a malfunctioning or shorted fuel injector can trigger the P1248 code, as it disrupts the voltage control circuit.

5. How can I diagnose the P1248 code on my 2017 GMC Sierra?

Start by inspecting the wiring and connectors for damage or corrosion, testing the injector with a multimeter, and checking for shorts in the circuit. A scan tool can also help monitor injector performance.

6. Is it safe to drive my 2017 GMC Sierra with the P1248 code?

Driving with this code is not recommended, as it can lead to poor engine performance, increased fuel consumption, and potential damage to other engine components.

7. How do I fix the P1248 code on a 2017 GMC Sierra?

Repairs may include replacing damaged wiring or connectors, repairing a short in the circuit, replacing the faulty injector, or reprogramming or replacing the ECM if necessary.

8. How much does it cost to repair the P1248 code on a 2017 GMC Sierra?

Costs vary depending on the issue. Wiring repairs may cost $100-$300, while replacing an injector can range from $200-$500. ECM replacement or reprogramming can cost $500 or more.

9. Can a faulty ECM cause the P1248 code on a 2017 GMC Sierra?

Yes, a malfunctioning ECM can fail to regulate the injector voltage, potentially causing the P1248 code.

10. Do I need a professional mechanic to fix the P1248 code on my 2017 GMC Sierra?

If the issue involves complex diagnostics, such as testing circuits or replacing the ECM, itâ€™s recommended to consult a professional mechanic to ensure proper repairs.