P124C 2015 GMC Sierra Code - Injector 5 Positive Voltage 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 5, Fuel Injector 5 harness is open or shorted, Fuel Injector 5 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
- P124C 2015 GMC Sierra indicates Injector 5 Positive Voltage Control Circuit Shorted to Control Circuit.
- Common causes
- Common causes include Faulty Fuel Injector 5, Fuel Injector 5 harness is open or shorted, Fuel Injector 5 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 P124C 2015 GMC Sierra Description
What are the Possible Causes of the DTC P124C 2015 GMC Sierra?
- Faulty Fuel Injector 5
- Fuel Injector 5 harness is open or shorted
- Fuel Injector 5 circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P124C 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 P124C 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 P124C 2015 GMC Sierra Code
1. What does the OBDII code P124C mean on a 2015 GMC Sierra?
P124C indicates that the Injector 5 Positive Voltage Control Circuit is shorted to the control circuit, meaning there is an electrical issue affecting the fifth fuel injector.
2. What are the common symptoms of code P124C on a 2015 GMC Sierra?
Symptoms may include rough idling, misfiring, reduced engine power, poor fuel economy, or the Check Engine Light being illuminated.
3. What causes the P124C code to appear on a 2015 GMC Sierra?
Common causes include a short circuit in the injector wiring, a damaged or faulty injector, poor electrical connections, or a malfunctioning powertrain control module (PCM).
4. Can I keep driving my 2015 GMC Sierra with the P124C code?
It’s not recommended to drive the vehicle for an extended period with this code, as it can lead to further engine damage or reduced performance.
5. How do I diagnose the P124C code on a 2015 GMC Sierra?
Diagnosis typically involves inspecting the wiring and connectors for Injector 5, testing the injector itself, and using a multimeter to check for shorts or open circuits.
6. How can I fix the P124C code on a 2015 GMC Sierra?
Repairs may involve replacing the faulty injector, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the PCM if necessary.
7. How much does it cost to repair the P124C code on a 2015 GMC Sierra?
The cost depends on the specific issue but can range from $150 to $500 for wiring repairs or injector replacement, and more for PCM-related issues.
8. Can a bad PCM cause the P124C code on a 2015 GMC Sierra?
Yes, a malfunctioning PCM can cause this code, though it’s less common than wiring or injector issues. It should only be replaced after ruling out other causes.
9. How can I prevent the P124C code from reoccurring on my 2015 GMC Sierra?
Regularly inspect and maintain the fuel injector wiring harness, ensure proper electrical connections, and address any engine performance issues promptly.
10. Is the P124C code specific to Injector 5 on a 2015 GMC Sierra?
Yes, this code specifically refers to an electrical issue with the positive voltage control circuit for Injector 5.
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