P124F 2015 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 2015 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 2015 GMC Sierra Description
What are the Possible Causes of the DTC P124F 2015 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 2015 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 2015 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 2015 GMC Sierra Code
1. What does the OBDII code P124F mean on a 2015 GMC Sierra?
P124F indicates that the Cylinder 8 Injector High Control Circuit is shorted to the control circuit, meaning there’s an electrical issue in the injector circuit for cylinder 8.
2. What are the common symptoms of code P124F in a 2015 GMC Sierra?
Symptoms may include rough idling, misfires, reduced engine performance, poor fuel economy, and an illuminated check engine light.
3. What causes the P124F code on a 2015 GMC Sierra?
Common causes include damaged or shorted wiring, a faulty fuel injector for cylinder 8, a defective powertrain control module (PCM), or corroded electrical connectors.
4. Can I drive with the P124F code on my 2015 GMC Sierra?
Driving with this code is not recommended, as it could cause further engine damage or lead to poor performance and increased fuel consumption.
5. How do I diagnose the P124F code on a 2015 GMC Sierra?
Start by visually inspecting the wiring and connectors for cylinder 8’s fuel injector, then use a multimeter to check for shorts or continuity issues in the circuit.
6. What is the most likely fix for the P124F code on a 2015 GMC Sierra?
The most common fix is repairing or replacing damaged wiring or connectors, or replacing the cylinder 8 fuel injector if it’s faulty.
7. How much does it cost to fix the P124F code on a 2015 GMC Sierra?
Repair costs can vary from $150 to $500 depending on whether it’s a simple wiring repair or if the fuel injector needs replacement.
8. Can a bad PCM cause the P124F code on a 2015 GMC Sierra?
Yes, although less common, a malfunctioning PCM could cause the P124F code if it’s not properly controlling the injector circuit.
9. Do I need to replace the cylinder 8 fuel injector to fix the P124F code?
Not always. First, inspect and test the wiring and connectors. Only replace the injector if it’s confirmed to be faulty.
10. How can I prevent the P124F code from recurring on my 2015 GMC Sierra?
Regular maintenance, inspecting wiring for damage, and ensuring connectors are clean and secure can help prevent this code from returning.
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