AutoCodes – GMC – P2157 2018 GMC Sierra

P2157 2018 GMC Sierra Code - Cylinder 4 Injector High Control Circuit High 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 4, Fuel Injector 4 harness is open or shorted, Fuel Injector 4 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: P2157 2018 GMC Sierra indicates Cylinder 4 Injector High Control Circuit High Voltage.
Common causes: Common causes include Faulty Fuel Injector 4, Fuel Injector 4 harness is open or shorted, Fuel Injector 4 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 173

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 P2157 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 voltage for greater than 2 s.

OBDII Code P2157 2018 GMC Sierra - Cylinder 4 Injector High Control Circuit High Voltage - AutoCodes.com — P2157 2018 GMC Sierra Code - Cylinder 4 Injector High Control Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P2157 2018 GMC Sierra?

Faulty Fuel Injector 4
Fuel Injector 4 harness is open or shorted
Fuel Injector 4 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P2157 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 P2157 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 P2157 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 P2157 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code P2157 on a 2018 GMC Sierra?

The common symptoms of code P2157 may include rough idling, engine misfires, decreased fuel efficiency, and in some cases, the Check Engine Light may be illuminated.

2. What does the OBDII code P2157 on a 2018 GMC Sierra mean?

Code P2157 indicates an issue with the high control circuit voltage of the fuel injector in cylinder 4 of the engine.

3. What are the possible causes of OBDII code P2157 on a 2018 GMC Sierra?

Possible causes of code P2157 can include a faulty fuel injector in cylinder 4, wiring or connector issues related to the injector, a malfunctioning Engine Control Module (ECM), or a poor electrical connection.

4. How can I diagnose the OBDII code P2157 on my 2018 GMC Sierra?

Diagnosing code P2157 typically involves using a scan tool to check for the code, inspecting the wiring and connectors around the fuel injector in cylinder 4, and testing the injector itself for proper function.

5. Can I drive my 2018 GMC Sierra with OBDII code P2157?

It is not recommended to drive your vehicle with code P2157 as it can lead to further engine damage or performance issues. It is best to address the underlying problem as soon as possible.

6. How can I repair OBDII code P2157 on my 2018 GMC Sierra?

Repairing code P2157 may involve replacing the fuel injector in cylinder 4 if it is faulty, repairing any damaged wiring or connectors, resetting the ECM, and clearing the trouble code.

7. Is it necessary to reset the ECM after repairing OBDII code P2157 on a 2018 GMC Sierra?

Yes, resetting the ECM is recommended after repairing code P2157 to clear the trouble code and ensure that the vehicle's computer recognizes the issue has been resolved.

8. Can a DIY enthusiast fix OBDII code P2157 on a 2018 GMC Sierra?

While some aspects of diagnosing and repairing code P2157 can be done by a DIY enthusiast, it is recommended to seek professional help for accurate diagnosis and proper repair to avoid any further complications.

9. How much does it cost to fix OBDII code P2157 on a 2018 GMC Sierra?

The cost of fixing code P2157 can vary depending on the root cause of the issue, the labor rates in your area, and whether any parts need to be replaced. It is advisable to get a quote from a qualified mechanic.

10. How can I prevent OBDII code P2157 from appearing on my 2018 GMC Sierra in the future?

Regular maintenance, such as fuel injector cleaning, checking wiring connections, and keeping up with scheduled servicing, can help prevent issues like code P2157 from occurring in the future.