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Engine-Codes – GMC – P2151 2015 GMC Sierra

P2151 2015 GMC Sierra Code - Cylinder 2 Injector High Control Circuit High Voltage

Quick Answer

The diagnostic trouble code P2151 for a 2015 GMC Sierra indicates an issue with the Cylinder 2 Injector High Control Circuit High Voltage. Common causes include Faulty fuel injector, Wiring issues in the control circuit, Problem with the Engine Control Module (ECM). 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
P2151 2015 GMC Sierra indicates Cylinder 2 Injector High Control Circuit High Voltage.
Common causes
Common causes include Faulty fuel injector, Wiring issues in the control circuit, Problem with the Engine Control Module (ECM).
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 16, 2024
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Code P2151 2015 GMC Sierra Description

The diagnostic trouble code P2151 for a 2015 GMC Sierra indicates an issue with the Cylinder 2 Injector High Control Circuit High Voltage. This code specifically points to a problem with the control circuit for the fuel injector in cylinder 2 of the engine. The fuel injector is responsible for delivering the precise amount of fuel into the combustion chamber at the right time for efficient engine operation. When the control circuit voltage for this injector is too high, it can lead to a variety of performance issues in the vehicle.

OBDII Code P2151 2015 GMC Sierra - Cylinder 2 Injector High Control Circuit High Voltage
P2151 2015 GMC Sierra Code - Cylinder 2 Injector High Control Circuit High Voltage

Common Causes of P2151 2015 GMC Sierra

  1. Faulty fuel injector
  2. Wiring issues in the control circuit
  3. Problem with the Engine Control Module (ECM)
  4. Poor connection in the circuit

Symptoms of P2151 2015 GMC Sierra

  1. Poor fuel economy
  2. Rough idling
  3. Hesitation or stumbling during acceleration
  4. Misfires
  5. Engine stalling

How to Fix P2151 2015 GMC Sierra

  1. Diagnose the specific cause of the high voltage in the control circuit using a scan tool and multimeter.
  2. Inspect the wiring harness and connectors for any damage or corrosion.
  3. Test the fuel injector for proper operation and resistance.
  4. Replace the faulty fuel injector or repair any wiring issues as needed.
  5. Clear the diagnostic trouble codes and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P2151 2015 GMC Sierra

The typical repair costs for addressing a Cylinder 2 Injector High Control Circuit High Voltage issue can range from $200 to $500, depending on the exact cause of the problem and the cost of parts and labor in your area. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate.

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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 P2151 2015 GMC Sierra Code

1. What are the common symptoms of OBDII code P2151 in a 2015 GMC Sierra related to the Cylinder 2 Injector High Control Circuit High Voltage?

The common symptoms include rough idling, engine misfires, decreased fuel efficiency, and potential stalling of the vehicle.

2. What are the possible causes of OBDII code P2151 in a 2015 GMC Sierra indicating an issue with the Cylinder 2 Injector High Control Circuit High Voltage?

Possible causes can include a faulty injector, wiring issues in the injector circuit, a problem with the Engine Control Module (ECM), or a poor electrical connection.

3. How can I diagnose the OBDII code P2151 in a 2015 GMC Sierra that points to Cylinder 2 Injector High Control Circuit High Voltage?

Diagnosis typically involves using a scan tool to read the code, checking the injector and wiring for any visible damage, and performing electrical tests to pinpoint the issue.

4. Is it safe to continue driving a 2015 GMC Sierra with OBDII code P2151 regarding the Cylinder 2 Injector High Control Circuit High Voltage?

It is not recommended to drive the vehicle with this code active, as it can lead to further engine damage and potential safety hazards. It is best to address the issue promptly.

5. How can I repair OBDII code P2151 in a 2015 GMC Sierra related to the Cylinder 2 Injector High Control Circuit High Voltage?

Repair options may include replacing the faulty injector, repairing or replacing damaged wiring, addressing ECM issues, and ensuring all electrical connections are secure.

6. Can a DIY enthusiast fix OBDII code P2151 in a 2015 GMC Sierra associated with the Cylinder 2 Injector High Control Circuit High Voltage?

While some basic troubleshooting steps can be performed by a DIY enthusiast, resolving the underlying issue may require advanced diagnostic tools and expertise, so professional help is often recommended.

7. Are there any preventive maintenance tips to avoid encountering OBDII code P2151 in a 2015 GMC Sierra regarding the Cylinder 2 Injector High Control Circuit High Voltage?

Regularly servicing the fuel system, using quality fuel, and ensuring proper maintenance of the vehicle's electrical components can help prevent issues leading to this OBDII code.

8. How long does it typically take to repair OBDII code P2151 in a 2015 GMC Sierra associated with the Cylinder 2 Injector High Control Circuit High Voltage?

The repair time can vary depending on the exact cause of the issue, but it may take a few hours to a full day to diagnose and fix the problem properly.

9. Will resetting the OBDII code P2151 in a 2015 GMC Sierra related to the Cylinder 2 Injector High Control Circuit High Voltage make the issue go away?

Resetting the code without addressing the underlying problem will not fix the issue permanently. It is crucial to diagnose and repair the root cause to prevent the code from reoccurring.

10. How much can I expect to pay for repairing OBDII code P2151 in a 2015 GMC Sierra indicating an issue with the Cylinder 2 Injector High Control Circuit High Voltage?

The cost of repair can vary based on the specific repairs needed, parts required, and labor rates in your area. It is advisable to obtain quotes from different mechanics or service centers for an accurate estimate.

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