P1238 GMC 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 GMC 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.
Code P1238 GMC Description
What are the Possible Causes of the DTC P1238 GMC?
- 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 GMC?
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.
Code Tech Notes
There is a factory service bulletin for the following models:
2004 GMC Sierra
2005 GMC Sierra
2004 GMC Topkick
2005 GMC Topkick
2004-2005 GMC Sierra, Topkick Factory Service Bulletin OBDII Code P1238
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1238 GMC 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 GMC code?
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Need Help with the Code?
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Frequently Asked Questions about P1238 GMC Code
1. What are the common symptoms of OBDII code P1238 GMC (Injector 6 Output Circuit)?
- Common symptoms include engine misfires, rough idling, decreased fuel efficiency, and potentially stalling while driving.
2. What can cause the OBDII code P1238 GMC to trigger?
- The code may be triggered by issues such as a faulty fuel injector, a damaged injector wiring harness, or a problem with the engine control module (ECM).
3. How can I diagnose the cause of OBDII code P1238 GMC?
- Diagnosing the code typically involves checking the wiring harness and connector for damage, testing the fuel injector, and inspecting the ECM for any faults.
4. Is it safe to continue driving with OBDII code P1238 GMC present?
- It is not recommended to drive with this code present, as it can lead to engine performance issues and potentially cause further damage if left unaddressed.
5. Can I repair OBDII code P1238 GMC on my own?
- Depending on your level of automotive knowledge, you may be able to repair this code on your own by replacing the faulty fuel injector, repairing the wiring harness, or addressing any ECM issues.
6. Will clearing the OBDII code P1238 GMC make it go away permanently?
- Clearing the code without addressing the underlying issue will not make it go away permanently. It is important to diagnose and repair the root cause to prevent the code from reoccurring.
7. How much does it typically cost to fix OBDII code P1238 GMC at a repair shop?
- The cost of fixing this code can vary depending on the specific issue, but it may range from a few hundred to a few thousand dollars, including parts and labor.
8. Are there any preventive measures I can take to avoid OBDII code P1238 GMC in the future?
- Regular maintenance of your vehicle, such as keeping up with fuel injector cleaning and inspecting wiring harnesses for wear, can help prevent issues that may trigger this code.
9. Can OBDII code P1238 GMC affect the overall performance of my vehicle?
- Yes, this code can significantly impact the performance of your vehicle by causing engine misfires, reduced power, and other drivability issues.
10. How urgent is it to address OBDII code P1238 GMC once it appears?
- It is recommended to address this code as soon as possible to prevent further damage to the engine and ensure optimal performance of your vehicle.
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