AutoCodes – GMC – P1249 2016 GMC Sierra

P1249 2016 GMC Sierra Code - Injector 2 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 2, Fuel Injector 2 harness is open or shorted, Fuel Injector 2 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: P1249 2016 GMC Sierra indicates Injector 2 Positive Voltage Control Circuit Shorted to Control Circuit.
Common causes: Common causes include Faulty Fuel Injector 2, Fuel Injector 2 harness is open or shorted, Fuel Injector 2 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 202

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 P1249 2016 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 P1249 2016 GMC Sierra - Injector 2 Positive Voltage Control Circuit Shorted to Control Circuit - AutoCodes.com — P1249 2016 GMC Sierra Code - Injector 2 Positive Voltage Control Circuit Shorted to Control Circuit

What does this mean?

What are the Possible Causes of the DTC P1249 2016 GMC Sierra?

Faulty Fuel Injector 2
Fuel Injector 2 harness is open or shorted
Fuel Injector 2 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P1249 2016 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 P1249 2016 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 P1249 2016 GMC Sierra 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 P1249 2016 GMC Sierra Code

1. What does the OBDII code P1249 mean on a 2016 GMC Sierra?

P1249 indicates that the Injector 2 Positive Voltage Control Circuit is shorted to the control circuit, meaning there is an electrical issue affecting the fuel injector's performance.

2. What are common symptoms of code P1249 on a 2016 GMC Sierra?

Symptoms may include rough idling, misfires, reduced engine power, poor fuel efficiency, or the Check Engine Light being illuminated.

3. What causes the P1249 code to appear on a 2016 GMC Sierra?

The code is typically caused by wiring issues, such as damaged or shorted wires, a failed fuel injector, a faulty ECM, or poor electrical connections.

4. Can a damaged fuel injector cause the P1249 code?

Yes, a damaged or faulty fuel injector can cause this code by disrupting the voltage control circuit for Injector 2.

5. How do you diagnose the P1249 code on a 2016 GMC Sierra?

Diagnosis involves inspecting the wiring and connectors for Injector 2, testing the injector itself, and checking the ECM for proper function using a multimeter or diagnostic scanner.

6. Can I drive my 2016 GMC Sierra with the P1249 code?

Driving with this code is not recommended as it can cause poor engine performance, potential damage to the engine, and increased emissions.

7. How do you repair the P1249 code on a 2016 GMC Sierra?

Repairs may include fixing or replacing damaged wiring, cleaning or reconnecting electrical connectors, replacing the faulty injector, or addressing a malfunctioning ECM.

8. How much does it cost to fix the P1249 code on a 2016 GMC Sierra?

Repair costs can vary widely depending on the issue, ranging from $50 to repair wiring to $500 or more if an injector or ECM replacement is required.

9. Can a loose connector cause the P1249 code?

Yes, a loose or corroded connector in the Injector 2 circuit can disrupt the electrical flow and trigger the code.

10. Does the P1249 code always mean the injector is bad?

No, the injector is not always the issue; the problem could also be with wiring, connectors, or the ECM. Proper diagnosis is essential to determine the exact cause.