AutoCodes – GMC – P0203 2017 GMC Sierra

P0203 2017 GMC Sierra Code - Cylinder 3 Injector Control Circuit

Quick Answer

The Engine Control Module (ECM) supplies voltage to each fuel injector on the high control circuits. Common causes include Faulty Fuel Injector 3, Fuel Injector 3 harness is open or shorted, Fuel Injector 3 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: P0203 2017 GMC Sierra indicates Cylinder 3 Injector Control Circuit.
Common causes: Common causes include Faulty Fuel Injector 3, Fuel Injector 3 harness is open or shorted, Fuel Injector 3 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 233

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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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 P0203 2017 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 control circuit is open for greater than 2 s.

OBDII Code P0203 2017 GMC Sierra - Cylinder 3 Injector Control Circuit - AutoCodes.com — P0203 2017 GMC Sierra Code - Cylinder 3 Injector Control Circuit

What does this mean?

What are the Possible Causes of the DTC P0203 2017 GMC Sierra?

Faulty Fuel Injector 3
Fuel Injector 3 harness is open or shorted
Fuel Injector 3 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0203 2017 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 P0203 2017 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 P0203 2017 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 P0203 2017 GMC Sierra Code

What does the OBDII code P0203 mean on a 2017 GMC Sierra?

P0203 indicates an issue with the Cylinder 3 Injector Control Circuit, meaning the engine control module (ECM) has detected a malfunction in the electrical circuit responsible for controlling the fuel injector on cylinder 3.

What are the common symptoms of code P0203 on a 2017 GMC Sierra?

Symptoms may include rough idling, misfires, reduced engine power, poor fuel economy, and the Check Engine Light being illuminated.

What causes the P0203 code on a 2017 GMC Sierra?

Common causes include a faulty fuel injector, damaged wiring or connectors in the injector circuit, a malfunctioning ECM, or excessive carbon deposits affecting injector performance.

Can you drive with the P0203 code on a 2017 GMC Sierra?

Driving with this code is not recommended, as it can lead to further engine damage, poor performance, and unsafe driving conditions due to misfires or reduced power.

How do you diagnose the P0203 code on a 2017 GMC Sierra?

Diagnosis typically involves inspecting the wiring and connectors for damage, testing the injector for proper operation, and using a multimeter to check voltage and continuity in the injector circuit.

How can the P0203 code on a 2017 GMC Sierra be fixed?

Fixes may include repairing or replacing damaged wiring, replacing the faulty fuel injector, cleaning carbon buildup, or replacing the ECM if it is determined to be defective.

What tools are needed to fix the P0203 code on a 2017 GMC Sierra?

Common tools include a diagnostic scanner, multimeter, wiring repair tools, and potentially injector cleaning or replacement tools.

How much does it cost to repair a P0203 code on a 2017 GMC Sierra?

Repair costs vary depending on the issue. Replacing a fuel injector can cost $200-$400, while ECM replacement can exceed $500. Wiring repairs are typically less expensive.

Can a dirty fuel injector cause the P0203 code on a 2017 GMC Sierra?

Yes, excessive carbon buildup or clogging in the injector can lead to poor operation and trigger the P0203 code. Cleaning or replacing the injector may resolve the issue.

How can you prevent the P0203 code on a 2017 GMC Sierra?

Regular maintenance, such as using quality fuel, cleaning injectors periodically, and inspecting wiring and connectors for damage, can help prevent this code from occurring.