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P2147 2018 GMC Sierra Code - Cylinder 1 Injector High Control Circuit Low Voltage

Quick Answer

The diagnostic trouble code P2147 for a 2018 GMC Sierra indicates an issue with the Cylinder 1 Injector High Control Circuit having low voltage. Common causes include Faulty fuel injector, Damaged wiring or connectors in the control circuit, Malfunctioning 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
P2147 2018 GMC Sierra indicates Cylinder 1 Injector High Control Circuit Low Voltage.
Common causes
Common causes include Faulty fuel injector, Damaged wiring or connectors in the control circuit, Malfunctioning 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 15, 2024
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Code P2147 2018 GMC Sierra Description

The diagnostic trouble code P2147 for a 2018 GMC Sierra indicates an issue with the Cylinder 1 Injector High Control Circuit having low voltage. This code is typically triggered when the Engine Control Module (ECM) detects that the voltage in the control circuit for the fuel injector in cylinder 1 is lower than the specified range. This can lead to improper fuel delivery to the cylinder, resulting in poor engine performance, reduced fuel efficiency, and potential drivability issues.

OBDII Code P2147 2018 GMC Sierra - Cylinder 1 Injector High Control Circuit Low Voltage
P2147 2018 GMC Sierra Code - Cylinder 1 Injector High Control Circuit Low Voltage

Common Causes of P2147 2018 GMC Sierra

  1. Faulty fuel injector
  2. Damaged wiring or connectors in the control circuit
  3. Malfunctioning ECM
  4. Power supply issues to the injector

Symptoms of P2147 2018 GMC Sierra

  1. Rough idling
  2. Misfires
  3. Hesitation during acceleration
  4. Reduced fuel efficiency
  5. Engine stalling

How to Fix P2147 2018 GMC Sierra

  1. Diagnose the issue using a scan tool to verify the P2147 code and check the voltage in the control circuit.
  2. Inspect the wiring and connectors for any damage or corrosion, repairing or replacing as necessary.
  3. Test the fuel injector for proper operation and replace if found to be faulty.
  4. Clear the code from the ECM memory and perform a test drive to ensure the issue has been resolved.

Cost to Fix P2147 2018 GMC Sierra

The typical repair costs for addressing a Cylinder 1 Injector High Control Circuit Low Voltage issue can range from $150 to $500, depending on the specific cause of the problem and the cost of parts and labor. 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 P2147 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code P2147 in a 2018 GMC Sierra?

- Common symptoms include rough idling, engine misfires, poor fuel efficiency, and the illumination of the Check Engine light.

2. What can cause the OBDII code P2147 to trigger in a 2018 GMC Sierra?

- The code P2147 typically triggers due to issues with the cylinder 1 injector high control circuit experiencing low voltage, which can be caused by wiring issues, a faulty injector, or a problem with the PCM.

3. How can I diagnose the cause of OBDII code P2147 in my 2018 GMC Sierra?

- Diagnosis involves inspecting the wiring harness for any damage, testing the injector for proper function, checking the voltage supply to the injector, and scanning the PCM for any related fault codes.

4. Can I still drive my 2018 GMC Sierra with OBDII code P2147?

- It is not recommended to drive the vehicle with code P2147 actively present, as it can lead to engine performance issues and potential damage. It is best to address the underlying problem promptly.

5. Is it possible to reset OBDII code P2147 in a 2018 GMC Sierra by disconnecting the battery?

- While disconnecting the battery may temporarily clear the code, it will not solve the underlying issue causing code P2147. Proper diagnosis and repair are necessary to prevent the code from reoccurring.

6. How much does it typically cost to repair OBDII code P2147 in a 2018 GMC Sierra?

- The cost of repairing code P2147 can vary depending on the exact cause of the issue. It may involve replacing a faulty injector, repairing wiring harnesses, or addressing PCM problems. Costs can range from a few hundred to over a thousand dollars.

7. Can a DIY enthusiast repair OBDII code P2147 in a 2018 GMC Sierra?

- While some enthusiasts may have the skills to diagnose and repair simple wiring issues related to code P2147, addressing injector or PCM problems may require specialized tools and expertise best handled by a professional mechanic.

8. Will OBDII code P2147 cause permanent damage to the engine of a 2018 GMC Sierra if left unaddressed?

- Ignoring code P2147 can lead to engine performance issues, reduced fuel efficiency, and potential damage over time if the root cause of the problem is not resolved promptly.

9. Are there any preventive measures to avoid OBDII code P2147 in a 2018 GMC Sierra?

- Regular maintenance, such as checking and cleaning fuel injectors, inspecting wiring harnesses for damage, and using high-quality fuel, can help prevent issues that may trigger code P2147.

10. Can a faulty fuel pump cause OBDII code P2147 in a 2018 GMC Sierra?

- While a faulty fuel pump is not a common cause of code P2147, it can indirectly affect the fuel delivery system and lead to issues that may trigger the code. It is essential to diagnose the specific cause accurately.

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