AutoCodes – GMC – P2157 2014 GMC Sierra

P2157 2014 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 2014 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 226

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 2014 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 2014 GMC Sierra - Cylinder 4 Injector High Control Circuit High Voltage - AutoCodes.com — P2157 2014 GMC Sierra Code - Cylinder 4 Injector High Control Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P2157 2014 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 2014 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 2014 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 2014 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 2014 GMC Sierra Code

1. What does the OBDII code P2157 mean on a 2014 GMC Sierra?

P2157 indicates a problem with the Cylinder 4 Injector High Control Circuit, specifically a high voltage issue.

2. What are the symptoms of a P2157 code?

Symptoms may include reduced engine performance, rough idling, misfires, poor fuel economy, and an illuminated check engine light.

3. What causes the P2157 code on a GMC Sierra?

Common causes include a faulty fuel injector, damaged wiring or connectors in the injector circuit, a malfunctioning engine control module (ECM), or corrosion in the electrical system.

4. Can I drive my 2014 GMC Sierra with a P2157 code?

Itâ€™s not recommended to drive with this code active, as it can lead to engine damage, poor performance, and increased emissions.

5. How do I diagnose the P2157 code?

Start by visually inspecting the wiring and connectors for Cylinder 4â€™s injector, check the fuel injectorâ€™s resistance with a multimeter, and use a scan tool to monitor voltage readings.

6. How can I fix the P2157 code?

Repairs may include replacing the faulty injector, repairing or replacing damaged wiring, cleaning corroded connectors, or reprogramming or replacing the ECM if needed.

7. How much does it cost to fix a P2157 code on a GMC Sierra?

The cost varies but typically ranges from $150 to $400 for parts and labor, depending on whether the injector or wiring needs replacement.

8. Can a bad ECM cause the P2157 code?

Yes, a malfunctioning ECM can send incorrect voltage signals to the fuel injector, triggering the P2157 code.

9. How do I prevent the P2157 code from recurring?

Regular maintenance, such as inspecting the wiring harness and connectors for corrosion or damage and ensuring proper injector operation, can help prevent this issue.

10. Will clearing the code fix the P2157 issue?

Clearing the code might turn off the check engine light temporarily, but the underlying problem must be repaired to prevent the code from returning.