AutoCodes – GMC – P2157 GMC

P2157 GMC 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 GMC 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 1,089

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 Mar 23, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2157 GMC 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 GMC - Cylinder 4 Injector High Control Circuit High Voltage - AutoCodes.com — P2157 GMC Code - Cylinder 4 Injector High Control Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P2157 GMC?

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 GMC?

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 GMC 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 GMC code?

Need more information on how to fix the P2157 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

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Information for Specific GMC Models

P2157 2014 GMC Sierra — Cylinder 4 Injector High Control Circuit High Voltage
P2157 2015 GMC Sierra — Cylinder 4 Injector High Control Circuit High Voltage
P2157 2016 GMC Sierra — Cylinder 4 Injector High Control Circuit High Voltage
P2157 2017 GMC Sierra — Cylinder 4 Injector High Control Circuit High Voltage
P2157 2018 GMC Sierra — Cylinder 4 Injector High Control Circuit High Voltage

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 GMC Code

1. What are the common symptoms of OBDII code P2157 in a GMC vehicle?

- Common symptoms include poor engine performance, rough idling, decreased fuel efficiency, and possible engine misfires.

2. What can cause the OBDII code P2157 to trigger in a GMC vehicle?

- The code P2157 is typically triggered by a high voltage condition in the control circuit for the fuel injector in cylinder 4.

3. How serious is the OBDII code P2157 in a GMC vehicle?

- While the vehicle may still be drivable with this code, it is important to address it promptly to prevent potential damage to the engine and ensure optimal performance.

4. How can I diagnose the cause of OBDII code P2157 in my GMC vehicle?

- Diagnosing the issue may involve inspecting the wiring harness for any damage, testing the fuel injector, and checking for any loose connections or corrosion.

5. Can a DIY enthusiast repair OBDII code P2157 in a GMC vehicle?

- Repairing this code may require advanced knowledge and tools. It is recommended to consult a professional mechanic for an accurate diagnosis and proper repair.

6. Is it safe to continue driving with the OBDII code P2157 present in a GMC vehicle?

- It is generally not recommended to drive with this code as it can lead to further issues and potential engine damage. It is best to address the problem as soon as possible.

7. How much does it typically cost to repair OBDII code P2157 in a GMC vehicle?

- The cost of repairing this code can vary depending on the specific underlying issue, parts needed, and labor costs. It is advisable to get a few quotes from reputable repair shops.

8. Can a faulty fuel injector cause the OBDII code P2157 to appear in a GMC vehicle?

- Yes, a faulty fuel injector in cylinder 4 can cause the high voltage condition that triggers the OBDII code P2157.

9. Are there any preventive maintenance measures to avoid OBDII code P2157 in a GMC vehicle?

- Regularly servicing the fuel injection system, ensuring proper fuel quality, and addressing any engine performance issues promptly can help prevent this code from appearing.

10. Will resetting the OBDII system clear the P2157 code in a GMC vehicle?

- While resetting the system may temporarily clear the code, it is important to diagnose and address the underlying issue to prevent the code from reappearing.