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Engine-Codes – GMC – P2151 2018 GMC Sierra

P2151 2018 GMC Sierra Code - Cylinder 2 Injector High Control Circuit High Voltage

Quick Answer

The P2151 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates an issue with the Cylinder 2 Injector High Control Circuit High Voltage. Common causes include Faulty fuel injector for cylinder 2, Damaged wiring or connectors in the control circuit, Malfunctioning 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 2018 GMC Sierra indicates Cylinder 2 Injector High Control Circuit High Voltage.
Common causes
Common causes include Faulty fuel injector for cylinder 2, Damaged wiring or connectors in the control circuit, Malfunctioning 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 14, 2024
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Code P2151 2018 GMC Sierra Description

The P2151 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates an issue with the Cylinder 2 Injector High Control Circuit High Voltage. This code is specifically related to the fuel injector for cylinder 2 in the engine. The fuel injector is responsible for delivering the precise amount of fuel into the combustion chamber at the right time to ensure proper engine performance. When the control circuit for the fuel injector in cylinder 2 detects a high voltage, it means that there is an electrical issue affecting the injector's operation.

OBDII Code P2151 2018 GMC Sierra - Cylinder 2 Injector High Control Circuit High Voltage
P2151 2018 GMC Sierra Code - Cylinder 2 Injector High Control Circuit High Voltage

Common Causes of P2151 2018 GMC Sierra

  1. Faulty fuel injector for cylinder 2
  2. Damaged wiring or connectors in the control circuit
  3. Malfunctioning engine control module (ECM)
  4. Issues with the power supply to the injector
  5. Corrosion or poor connections in the electrical system

Symptoms of P2151 2018 GMC Sierra

  1. Rough idling or engine misfires
  2. Decreased fuel efficiency
  3. Engine hesitation or stalling
  4. Illumination of the check engine light
  5. Engine performance issues such as lack of power or acceleration

How to Fix P2151 2018 GMC Sierra

  1. Begin by conducting a thorough inspection of the fuel injector, wiring, and connectors to identify any visible damage or issues.
  2. Test the fuel injector and control circuit using a multimeter to check for proper voltage and continuity.
  3. Replace the faulty fuel injector if necessary and repair or replace any damaged wiring or connectors.
  4. Clear the DTC from the vehicle's ECM using a diagnostic scan tool and perform a test drive to ensure the issue has been resolved.
  5. If the problem persists, further diagnostics may be required to identify any underlying issues with the ECM or power supply.

Cost to Fix P2151 2018 GMC Sierra

The typical repair costs for addressing a P2151 code on a 2018 GMC Sierra can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, the cost of replacing a fuel injector can range from $150 to $300 per injector, while the cost of labor for diagnosis and repair can range from $80 to $150 per hour. Additional costs may include replacement wiring or connectors, as well as any necessary diagnostic tests or tools. It's recommended to consult with a qualified mechanic or auto repair shop for a more accurate estimate based on the specific circumstances of the 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 P2151 2018 GMC Sierra Code

1. What are common symptoms of OBDII code P2151 in a 2018 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 the Check Engine light illuminating.

2. What are the possible causes of OBDII code P2151 in a 2018 GMC Sierra indicating an issue with the Cylinder 2 Injector High Control Circuit High Voltage?

Potential causes include a faulty fuel injector in cylinder 2, wiring issues in the injector circuit, a defective fuel injector driver in the engine control module, or a poor electrical connection.

3. How can I diagnose OBDII code P2151 in a 2018 GMC Sierra to confirm the Cylinder 2 Injector High Control Circuit High Voltage issue?

Diagnose the code by inspecting the wiring and connectors related to the cylinder 2 fuel injector, testing the injector's resistance, and checking for any signs of damage or corrosion in the circuit.

4. Can I drive my 2018 GMC Sierra with OBDII code P2151 due to the Cylinder 2 Injector High Control Circuit High Voltage problem?

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

5. What is the typical repair process for resolving OBDII code P2151 in a 2018 GMC Sierra linked to the Cylinder 2 Injector High Control Circuit High Voltage?

The repair process usually involves replacing the faulty fuel injector in cylinder 2, repairing any damaged wiring or connectors, and resetting the Check Engine light after the issue is resolved.

6. Are there any DIY repair tips for fixing OBDII code P2151 in a 2018 GMC Sierra associated with the Cylinder 2 Injector High Control Circuit High Voltage?

While some basic diagnosis tasks can be performed by DIY enthusiasts, it's recommended to seek professional help for repairing this specific issue due to the complexity of the fuel injector and electrical components involved.

7. How much does it typically cost to repair OBDII code P2151 in a 2018 GMC Sierra caused by the Cylinder 2 Injector High Control Circuit High Voltage issue?

The repair cost can vary depending on the root cause of the problem, but it may range from $200 to $500 for parts and labor, excluding diagnostic fees.

8. Can resetting the Check Engine light resolve OBDII code P2151 in a 2018 GMC Sierra related to the Cylinder 2 Injector High Control Circuit High Voltage?

Simply resetting the light will not fix the underlying issue causing the code. It's essential to diagnose and address the root cause of the problem to prevent it from reoccurring.

9. Is OBDII code P2151 in a 2018 GMC Sierra due to the Cylinder 2 Injector High Control Circuit High Voltage a common issue?

While not as common as some other OBDII codes, issues with injector circuits can occur in vehicles, including the 2018 GMC Sierra. Proper maintenance and timely repairs can help prevent such problems.

10. How can I prevent OBDII code P2151 from occurring in my 2018 GMC Sierra related to the Cylinder 2 Injector High Control Circuit High Voltage in the future?

Regular maintenance, including checking and cleaning fuel injectors, inspecting wiring harnesses for damage, and using quality fuel, can help prevent issues leading to this code.

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