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P1249 2016 GMC Sierra Code - Injector 2 Positive Voltage Control Circuit Shorted to Control Circuit

Quick Answer

The P1249 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates that there is a problem with the Injector 2 Positive Voltage Control Circuit being shorted to the Control Circuit. Common causes include Damaged wiring: Wires connecting the fuel injector to the ECM may be frayed or broken, Faulty injector: The fuel injector itself may be malfunctioning and causing a short circuit, ECM issues: Problems with the engine control module can affect the injector control circuit. 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 Damaged wiring: Wires connecting the fuel injector to the ECM may be frayed or broken, Faulty injector: The fuel injector itself may be malfunctioning and causing a short circuit, ECM issues: Problems with the engine control module can affect the injector control circuit.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 07, 2024
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Code P1249 2016 GMC Sierra Description

The P1249 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates that there is a problem with the Injector 2 Positive Voltage Control Circuit being shorted to the Control Circuit. In simpler terms, this means that there is a malfunction in the electrical system that controls the fuel injector for cylinder number 2. The fuel injector is responsible for delivering the right amount of fuel into the combustion chamber for efficient engine operation.

OBDII Code P1249 2016 GMC Sierra - Injector 2 Positive Voltage Control Circuit Shorted to Control Circuit
P1249 2016 GMC Sierra Code - Injector 2 Positive Voltage Control Circuit Shorted to Control Circuit

Common Causes of P1249 2016 GMC Sierra

  1. Damaged wiring: Wires connecting the fuel injector to the ECM may be frayed or broken.
  2. Faulty injector: The fuel injector itself may be malfunctioning and causing a short circuit.
  3. ECM issues: Problems with the engine control module can affect the injector control circuit.
  4. Poor electrical connections: Corrosion or loose connections in the circuit can lead to a short.

Symptoms of P1249 2016 GMC Sierra

  1. Rough idle: The engine may run erratically or vibrate excessively at idle.
  2. Misfires: Cylinder misfires can occur, leading to a loss of power and performance.
  3. Difficulty starting: The engine may struggle to start or take longer than usual to turn over.
  4. Decreased fuel efficiency: The vehicle may consume more fuel than usual due to improper fuel delivery.
  5. Engine stalling: In severe cases, the engine may stall unexpectedly while driving.

How to Fix P1249 2016 GMC Sierra

  1. Diagnose the issue: Use a multimeter to test the voltage in the injector circuit and identify the source of the short.
  2. Repair or replace wiring: If damaged wiring is the cause, repair or replace the affected wires.
  3. Test the injector: Check the fuel injector for proper operation and replace it if necessary.
  4. Inspect the ECM: Test the engine control module for any faults and replace if needed.
  5. Clear the code: After making repairs, clear the DTC using a scan tool to reset the Check Engine Light.

Cost to Fix P1249 2016 GMC Sierra

The typical repair costs for addressing a P1249 code on a 2016 GMC Sierra can range from $150 to $500, depending on the specific cause of the issue and the cost of parts and labor. This estimate includes the price of diagnostic services, replacement wiring or injector, and any necessary labor. It's important to note that prices can vary based on the location of the repair shop, the make and model of the vehicle, and the expertise of the technicians. Additionally, it's recommended to get multiple quotes from different shops to ensure a fair price for the repair.

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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.

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