P124F 2018 GMC Sierra Code - Cylinder 8 Injector High Control Circuit Shorted to Control Circuit
Quick Answer
The Engine Control Module (ECM) supplies voltage to each fuel injector on the injector high voltage supply circuits. Common causes include Faulty Fuel Injector 8, Fuel Injector 8 harness is open or shorted, Fuel Injector 8 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
- P124F 2018 GMC Sierra indicates Cylinder 8 Injector High Control Circuit Shorted to Control Circuit.
- Common causes
- Common causes include Faulty Fuel Injector 8, Fuel Injector 8 harness is open or shorted, Fuel Injector 8 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 P124F 2018 GMC Sierra Description
What are the Possible Causes of the DTC P124F 2018 GMC Sierra?
- Faulty Fuel Injector 8
- Fuel Injector 8 harness is open or shorted
- Fuel Injector 8 circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P124F 2018 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 P124F 2018 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.
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Frequently Asked Questions about P124F 2018 GMC Sierra Code
1. What does OBDII code P124F mean on a 2018 GMC Sierra?
Code P124F indicates that the Cylinder 8 Injector High Control Circuit is shorted to the control circuit, signaling an electrical issue in the fuel injector system.
2. What are the symptoms of code P124F in a 2018 GMC Sierra?
Common symptoms include rough idling, reduced engine performance, misfires, poor fuel economy, and the Check Engine Light being illuminated.
3. What causes the P124F code to appear?
Potential causes include a shorted or damaged injector wiring harness, a faulty fuel injector, a defective engine control module (ECM), or poor electrical connections.
4. Can I drive my 2018 GMC Sierra with a P124F code?
Driving with this code is not recommended as it can lead to poor engine performance, misfires, or potential damage to other engine components.
5. How do I diagnose the P124F code on my GMC Sierra?
Start by inspecting the wiring and connectors for Cylinder 8's fuel injector, check for shorts or damage, and test the injector itself for proper resistance and function.
6. How can I fix the P124F code on my 2018 GMC Sierra?
Repairs may include replacing the faulty fuel injector, repairing or replacing damaged wiring, cleaning corroded connections, or reprogramming or replacing the ECM if necessary.
7. How much does it cost to fix a P124F code on a GMC Sierra?
Repair costs can vary but typically range from $150 to $600 depending on whether the issue is with the wiring, injector, or ECM.
8. Can a bad fuel injector cause a P124F code?
Yes, a faulty or shorted fuel injector in Cylinder 8 can trigger the P124F code due to electrical circuit issues.
9. What tools are needed to troubleshoot the P124F code?
You'll need an OBDII scanner, a digital multimeter, and possibly an injector tester to properly diagnose the issue.
10. Will clearing the P124F code with a scanner fix the problem?
Clearing the code will temporarily turn off the Check Engine Light, but the underlying issue must be resolved to prevent the code from returning.
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