AutoCodes – GMC – P0203 2016 GMC Sierra

P0203 2016 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 2016 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 303

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P0203 2016 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 2016 GMC Sierra - Cylinder 3 Injector Control Circuit - AutoCodes.com — P0203 2016 GMC Sierra Code - Cylinder 3 Injector Control Circuit

What does this mean?

What are the Possible Causes of the DTC P0203 2016 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 2016 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 2016 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 2016 GMC Sierra code?

Need more information on how to fix the P0203 2016 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0203 2016 GMC Sierra code diagnosed by a professional: Find a repair shop in your area

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 2016 GMC Sierra Code

What does OBD-II code P0203 mean for a 2016 GMC Sierra?

Code P0203 indicates a malfunction in the cylinder 3 injector control circuit, which means the engine control module (ECM) is detecting an issue with the electrical signal to the fuel injector on cylinder 3.

What are common symptoms of code P0203 in a 2016 GMC Sierra?

Symptoms can include rough idling, reduced engine performance, misfires, poor fuel efficiency, and the check engine light illuminating.

What causes code P0203 to appear in a 2016 GMC Sierra?

Common causes include a faulty cylinder 3 fuel injector, damaged wiring or connectors in the injector circuit, or a malfunctioning engine control module (ECM).

Can driving with code P0203 damage my 2016 GMC Sierra?

Driving with this code can lead to engine misfires, poor performance, and potential damage to other engine components if left unresolved. Itâ€™s best to address the issue promptly.

How do you diagnose code P0203 in a 2016 GMC Sierra?

A mechanic will use a scan tool to confirm the code, inspect the wiring and connectors for damage, test the cylinder 3 injector for proper function, and check the ECM for faults.

What tools are required to fix code P0203 in a 2016 GMC Sierra?

You may need a digital multimeter, a diagnostic scan tool, and basic hand tools for wire repairs or injector replacement.

How do you fix code P0203 in a 2016 GMC Sierra?

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

Can a dirty fuel injector cause code P0203 in a 2016 GMC Sierra?

Yes, a clogged or dirty injector can restrict fuel flow and cause the ECM to detect a fault in the injector circuit. Cleaning or replacing the injector may resolve the issue.

How much does it cost to repair code P0203 in a 2016 GMC Sierra?

The cost can vary depending on the cause, ranging from $50-$150 for wiring repairs to $200-$500 for injector replacement. ECM repairs can exceed $1,000.

Is code P0203 a common issue for the 2016 GMC Sierra?

While not extremely common, this code can occur if there is an electrical or mechanical fault with the fuel injector system, especially after high mileage or poor maintenance.