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P1249 2015 GMC Sierra Code - Injector 2 Positive Voltage Control Circuit Shorted to Control Circuit

Quick Answer

The P1249 diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates that there is a short circuit between the positive voltage control circuit and the control circuit of injector 2. Common causes include Damaged wiring or connectors in the injector control circuit, Short circuit in the wiring harness, Faulty fuel injector. 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 2015 GMC Sierra indicates Injector 2 Positive Voltage Control Circuit Shorted to Control Circuit.
Common causes
Common causes include Damaged wiring or connectors in the injector control circuit, Short circuit in the wiring harness, Faulty fuel injector.
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 17, 2024
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Code P1249 2015 GMC Sierra Description

The P1249 diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates that there is a short circuit between the positive voltage control circuit and the control circuit of injector 2. In simpler terms, this means that there is an electrical issue in the wiring that controls the fuel injector for cylinder 2. The fuel injector is responsible for delivering the precise amount of fuel into the combustion chamber at the right time, ensuring proper engine performance. When there is a short circuit in the control circuit, it can disrupt the injector's operation, leading to potential engine misfires, rough idling, decreased fuel efficiency, and overall poor performance.

OBDII Code P1249 2015 GMC Sierra - Injector 2 Positive Voltage Control Circuit Shorted to Control Circuit
P1249 2015 GMC Sierra Code - Injector 2 Positive Voltage Control Circuit Shorted to Control Circuit

Common Causes of P1249 2015 GMC Sierra

  1. Damaged wiring or connectors in the injector control circuit
  2. Short circuit in the wiring harness
  3. Faulty fuel injector
  4. Corrosion or moisture in the electrical connections
  5. Electrical issues in the Engine Control Module (ECM)

Symptoms of P1249 2015 GMC Sierra

  1. Engine misfires
  2. Rough idling or stalling
  3. Decreased fuel efficiency
  4. Check Engine Light illuminated
  5. Loss of power or acceleration

How to Fix P1249 2015 GMC Sierra

  1. Begin by conducting a thorough visual inspection of the wiring harness and connectors associated with injector 2.
  2. Use a multimeter to test the continuity and resistance of the wiring to identify any short circuits or open circuits.
  3. Inspect the fuel injector for proper operation and replace it if necessary.
  4. Clear the DTC from the vehicle's ECM using a scan tool after completing the repair.
  5. Perform a test drive to ensure that the issue has been resolved and that the vehicle is running smoothly.

Cost to Fix P1249 2015 GMC Sierra

The typical repair costs for addressing a P1249 code on a 2015 GMC Sierra can vary depending on the specific cause of the issue. In general, the cost of parts such as a new fuel injector or wiring harness can range from $100 to $500. Labor costs at auto repair shops typically range from $80 to $150 per hour, and the total repair time can vary based on the complexity of the issue. Therefore, the total cost for addressing this code could range from $200 to $1000 or more, including parts and labor. It is advisable to consult with a qualified mechanic or dealership for a more accurate cost estimate based on the specific diagnosis and repair needed for your vehicle.

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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 2015 GMC Sierra Code

1. What does the OBDII code P1249 mean for a 2015 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 operation for cylinder 2.

2. What are the common symptoms of code P1249 in a 2015 GMC Sierra?

Common symptoms include poor engine performance, rough idling, misfires, reduced fuel efficiency, and possibly a check engine light.

3. What causes the P1249 code in a 2015 GMC Sierra?

The code can be caused by damaged wiring, a short circuit, a faulty injector, a corroded connector, or a malfunctioning engine control module (ECM).

4. Can I drive my 2015 GMC Sierra with the P1249 code?

It’s not recommended to drive with this code, as it could lead to further engine damage or unsafe driving conditions due to misfires or reduced power.

5. How do I diagnose the P1249 code on my 2015 GMC Sierra?

Start by inspecting the wiring and connectors for cylinder 2’s injector, checking for shorts, corrosion, or damage. Then test the injector and circuit with a multimeter or consult a mechanic.

6. How much does it cost to fix the P1249 code?

Repair costs can vary, ranging from $50 for minor wiring repairs to $300 or more if the injector or ECM needs replacement.

7. Can a bad fuel injector cause the P1249 code?

Yes, a faulty fuel injector for cylinder 2 can trigger the P1249 code if it is not functioning properly or if it is causing a short in the circuit.

8. How do I reset the P1249 code on my 2015 GMC Sierra?

After fixing the issue, you can reset the code by using an OBDII scanner to clear it, or the ECM will clear it automatically after several drive cycles if the problem is resolved.

9. Could the P1249 code indicate a problem with the ECM?

Yes, if the wiring and injector are in good condition, the ECM might be malfunctioning and failing to properly control the injector circuit.

10. Are there any related codes that might appear with P1249?

Yes, related codes such as P0202 (Injector Circuit Malfunction for Cylinder 2) or other injector-related codes may appear, indicating additional issues in the system.

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