P124D 2018 GMC Sierra Code - Injector 6 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 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
- P124D 2018 GMC Sierra indicates Injector 6 Positive Voltage Control Circuit Shorted to Control 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 P124D 2018 GMC Sierra Description
What are the Possible Causes of the DTC P124D 2018 GMC Sierra?
- Faulty Fuel Injector 6
- Fuel Injector 6 harness is open or shorted
- Fuel Injector 6 circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P124D 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 P124D 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 P124D 2018 GMC Sierra Code
What does the OBDII code P124D mean on a 2018 GMC Sierra?
Code P124D indicates an issue with Injector 6, where the positive voltage control circuit is shorted to the control circuit.
What are the common symptoms of the P124D code?
Symptoms may include rough idling, misfire on cylinder 6, reduced engine performance, and an illuminated check engine light.
What causes the P124D code to appear?
Possible causes include damaged wiring or connectors for Injector 6, a faulty injector, or issues with the powertrain control module (PCM).
How can I diagnose the P124D code on my 2018 GMC Sierra?
Start by inspecting the wiring and connectors for Injector 6 for damage or loose connections. Use a multimeter to test for shorts or continuity issues.
Can a faulty fuel injector cause the P124D code?
Yes, a faulty Injector 6 can cause this code if it fails to properly regulate voltage or if it has an internal short.
Is it safe to drive with the P124D code?
Driving with this code can cause further engine damage or reduced performance. It’s best to address the issue as soon as possible.
How do I fix the P124D code on my GMC Sierra?
Repairs may involve replacing damaged wiring, repairing or replacing Injector 6, or reprogramming the PCM if needed.
Can a failing PCM trigger the P124D code?
Yes, a malfunctioning PCM can misinterpret voltage signals and trigger the P124D code, though this is less common.
What tools are needed to troubleshoot the P124D code?
You’ll need a scan tool to read live data, a multimeter to check circuits, and potentially specialized tools to test or replace the fuel injector.
How much does it cost to repair the P124D code?
Repair costs can vary, ranging from $100 for wiring repairs to $300-$500 for injector replacement, depending on parts and labor.
Discuss the causes and fixes for P124D 2018 GMC Sierra OBDII Code
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