AutoCodes – Chevrolet – P1223 Chevrolet

P1223 Chevrolet Code - Injector 1 Output Circuit

Quick Answer

The Engine Control Module (ECM) enables the appropriate fuel injector on the compression stroke for each cylinder. Common causes include Faulty Fuel Injector 1, Fuel Injector 1 harness is open or shorted, Fuel Injector 1 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: P1223 Chevrolet indicates Injector 1 Output Circuit.
Common causes: Common causes include Faulty Fuel Injector 1, Fuel Injector 1 harness is open or shorted, Fuel Injector 1 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 4,220

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 25, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P1223 Chevrolet Description

The Engine Control Module (ECM) enables the appropriate fuel injector on the compression stroke for each cylinder. The ECM controls the Fuel Injection Control Module (FICM) by grounding the control circuit via a solid state device called a driver. The ECM monitors the state of the driver. If the ECM detects an incorrect voltage for the commanded state of an injector driver, Diagnostic Trouble Code (DTC) P1223, P1226, P1229, P1232, P1235, P1238, P1241, or P1244 will set.

OBDII Code P1223 Chevrolet - Injector 1 Output Circuit - AutoCodes.com — P1223 Chevrolet Code - Injector 1 Output Circuit

What does this mean?

What are the Possible Causes of the DTC P1223 Chevrolet?

Faulty Fuel Injector 1
Fuel Injector 1 harness is open or shorted
Fuel Injector 1 circuit poor electrical connection
Faulty Fuel Injection Control Module (FICM)
Faulty Engine Control Module (ECM)

How to Fix the DTC P1223 Chevrolet?

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 does this mean?

Code Tech Notes

If only 1 fuel injector Control circuit Diagnostic Trouble Code (DTC) is set, an open circuit or poor connection is the most likely cause. If groups of 4 fuel injector Control circuit DTCs are set, suspect a short to ground. Cylinder groups are 2, 3, 5, 8 or 1, 4, 6, 7. More than 4 fuel injector Control circuit DTCs set indicate short to voltage on fuel injector Control circuit is the most likely cause.

There is a factory service bulletin for the following Chevrolet models:

2004 Chevrolet Kodiak
2005 Chevrolet Kodiak
2004 Chevrolet Silverado
2005 Chevrolet Silverado
2004-2005 Chevrolet Kodiak, Silverado Factory Service Bulletin OBDII Code P1223

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1223 Chevrolet 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 P1223 Chevrolet code?

Need more information on how to fix the P1223 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1223 Chevrolet 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 P1223 Chevrolet Code

What does the OBDII code P1223 mean on a Chevrolet?

P1223 indicates an issue with the Injector 1 Output Circuit, meaning the engine control module (ECM) has detected a problem in the electrical circuit for fuel injector 1.

What are the common symptoms of code P1223 in a Chevrolet?

Common symptoms include rough idling, engine misfires, reduced power, poor fuel economy, or the engine failing to start.

What causes code P1223 to appear on a Chevrolet vehicle?

Causes may include a faulty fuel injector, damaged or corroded wiring, a loose or damaged injector connector, or a failing ECM.

Can I still drive my Chevrolet with code P1223 present?

Driving with this code is not recommended, as it can lead to engine misfires, reduced performance, and potential damage to other engine components.

How do I diagnose code P1223 on a Chevrolet?

Start by inspecting the wiring and connectors for Injector 1, check the resistance of the injector with a multimeter, and use a scan tool to monitor injector operation.

Can a dirty fuel injector cause code P1223 in a Chevrolet?

While a dirty injector may not directly trigger this code, it can contribute to injector performance issues. The code typically points to an electrical fault.

How can I fix code P1223 on my Chevrolet?

Repairs may include replacing the faulty injector, repairing damaged wires or connectors, or, in rare cases, replacing the ECM if it’s determined to be defective.

What tools are needed to troubleshoot P1223 on a Chevrolet?

You’ll typically need a scan tool, a multimeter, and possibly wiring diagrams for your vehicle to diagnose the issue accurately.

How much does it cost to repair code P1223 on a Chevrolet?

Costs vary depending on the repair. Replacing a fuel injector may cost $200-$400, while fixing wiring or connectors is usually less expensive. ECM replacement is significantly more.

Can code P1223 clear itself after the issue is fixed?

The code may clear itself after several successful drive cycles, but it’s best to use a scan tool to clear the code and verify the repair.