AutoCodes – Chevrolet – P1238 Chevrolet

P1238 Chevrolet Code - Injector 6 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 6, Fuel Injector 6 harness is open or shorted, Fuel Injector 6 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: P1238 Chevrolet indicates Injector 6 Output Circuit.
Common causes: Common causes include Faulty Fuel Injector 6, Fuel Injector 6 harness is open or shorted, Fuel Injector 6 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 7,875

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 P1238 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 P1238 Chevrolet - Injector 6 Output Circuit - AutoCodes.com — P1238 Chevrolet Code - Injector 6 Output Circuit

What does this mean?

What are the Possible Causes of the DTC P1238 Chevrolet?

Faulty Fuel Injector 6
Fuel Injector 6 harness is open or shorted
Fuel Injector 6 circuit poor electrical connection
Faulty Fuel Injection Control Module (FICM)
Faulty Engine Control Module (ECM)

How to Fix the DTC P1238 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 P1238

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1238 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 P1238 Chevrolet code?

Need more information on how to fix the P1238 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1238 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 P1238 Chevrolet Code

1. What does OBDII code P1238 for Chevrolet mean?

The code P1238 indicates an issue with the Injector 6 Output Circuit in a Chevrolet vehicle.

2. What are the common symptoms of OBDII code P1238 in a Chevrolet?

Common symptoms include rough idling, engine misfires, poor acceleration, and potentially a Check Engine light.

3. What can cause the OBDII code P1238 to trigger in a Chevrolet?

Possible causes include a faulty fuel injector, wiring issues in the injector circuit, or a problem with the Engine Control Module (ECM).

4. How serious is the OBDII code P1238 in a Chevrolet?

Ignoring this code can lead to engine performance issues and potential long-term damage. It's best to address it promptly.

5. How can I diagnose the OBDII code P1238 in my Chevrolet?

A thorough inspection of the injector wiring, connector, and the injector itself can help pinpoint the issue. A professional diagnostic tool can also help identify the exact problem.

6. Can I drive my Chevrolet with the OBDII code P1238 active?

It's not recommended to drive the vehicle with this code active, as it can lead to poor engine performance and potential damage.

7. How can I repair the OBDII code P1238 in my Chevrolet?

Repair may involve replacing the faulty fuel injector, repairing damaged wiring, or addressing any ECM issues. It's best to consult a mechanic for a proper diagnosis and repair.

8. Are there any simple maintenance tips to prevent OBDII code P1238 in a Chevrolet?

Regularly servicing your vehicle, using high-quality fuel, and keeping an eye on any changes in engine performance can help prevent this code.

9. Is it possible to reset the OBDII code P1238 in a Chevrolet without repairs?

While clearing the code may temporarily turn off the Check Engine light, it's crucial to address the underlying issue to prevent further problems.

10. Can a DIY enthusiast fix the OBDII code P1238 in a Chevrolet?

Depending on your skill level and access to tools, you may be able to address simple wiring issues. However, complex problems may require professional assistance.