P124F 2015 GMC Sierra Code - Cylinder 8 Injector High Control Circuit Shorted to Control Circuit
Quick Answer
When the diagnostic trouble code P124F appears on a 2015 GMC Sierra, it indicates that there is a problem with the Cylinder 8 Injector High Control Circuit being shorted to the Control Circuit. Common causes include Short circuit in the wiring harness, Faulty fuel injector for cylinder 8, Issues with the engine control module (ECM). 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 Short circuit in the wiring harness, Faulty fuel injector for cylinder 8, Issues with the engine control module (ECM).
- 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.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code P124F 2015 GMC Sierra Description
When the diagnostic trouble code P124F appears on a 2015 GMC Sierra, it indicates that there is a problem with the Cylinder 8 Injector High Control Circuit being shorted to the Control Circuit. In simpler terms, this means that there is an issue with the fuel injector for cylinder 8, specifically with the control circuit wiring. The fuel injector is responsible for delivering the correct amount of fuel into the combustion chamber for ignition. When the control circuit is shorted, it can lead to improper fuel delivery, which can significantly impact the engine's performance.
Common Causes of P124F 2015 GMC Sierra
- Short circuit in the wiring harness.
- Faulty fuel injector for cylinder 8.
- Issues with the engine control module (ECM).
- Corrosion or poor connection in the wiring connectors.
- Physical damage to the wiring or components.
Symptoms of P124F 2015 GMC Sierra
- Engine misfires or hesitation during acceleration.
- Rough idling or stalling at idle.
- Decreased fuel efficiency.
- Check Engine Light illuminated on the dashboard.
- Reduced power and performance.
How to Fix P124F 2015 GMC Sierra
- Begin by conducting a visual inspection of the wiring harness and connectors for any signs of damage, corrosion, or loose connections.
- Use a multimeter to test the continuity of the wiring and check for any short circuits.
- Test the fuel injector for cylinder 8 to ensure it is functioning correctly. If necessary, replace the faulty injector.
- Clear the diagnostic trouble codes and reset the engine control module (ECM) to see if the issue persists.
- If the problem persists, further diagnostic testing may be required to pinpoint the exact cause of the short circuit in the control circuit.
Cost to Fix P124F 2015 GMC Sierra
The typical repair costs for addressing the P124F code on a 2015 GMC Sierra can vary depending on the specific cause of the issue. In general, replacing a faulty fuel injector can cost between $150 to $300 per injector, not including labor costs. Diagnostic testing and troubleshooting may add to the overall repair costs. Labor rates at auto repair shops can vary between $80 and $150 per hour, so it's advisable to check with local shops for a more precise estimate based on your location and the specific vehicle make and model.
Need more information about the P124F 2015 GMC Sierra code?
Need more information on how to fix the P124F 2015 GMC Sierra code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P124F 2015 GMC Sierra code diagnosed by a professional: Find a repair shop in your area
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.
Discuss the causes and fixes for P124F 2015 GMC Sierra OBDII Code
Code P124F 2015 GMC Sierra comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.