AutoCodes – GMC – P2147 2018 GMC Sierra

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

Quick Answer

The Engine Control Module (ECM) supplies voltage to each fuel injector on the high control circuits. Common causes include Faulty Fuel Injector 1, Fuel Injector 1 harness is open or shorted, Fuel Injector 1 circuit poor electrical connection. 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 1, Fuel Injector 1 harness is open or shorted, Fuel Injector 1 circuit poor electrical connection.
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.

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Code Popularity 217

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 08, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2147 2018 GMC Sierra Description

The Engine Control Module (ECM) supplies voltage to each fuel injector on the high control circuits. The ECM energizes each fuel injector by grounding the low control circuit of the fuel injector. The ECM monitors the status of the fuel injector circuits. When a fuel injector circuit condition is detected by the ECM, the affected fuel injector(s) is disabled. The Diagnostic Trouble Code (DTC) will be set when the ECM detects the fuel injector high voltage supply circuit is shorted to ground for greater than 2 s.

OBDII Code P2147 2018 GMC Sierra - Cylinder 1 Injector High Control Circuit Low Voltage - AutoCodes.com — P2147 2018 GMC Sierra Code - Cylinder 1 Injector High Control Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P2147 2018 GMC Sierra?

Faulty Fuel Injector 1
Fuel Injector 1 harness is open or shorted
Fuel Injector 1 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P2147 2018 GMC Sierra?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2147 2018 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P2147 2018 GMC Sierra code?

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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.