P124D 2018 GMC Sierra Code - Injector 6 Positive Voltage Control Circuit Shorted to Control Circuit
Quick Answer
The P124D diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates that there is a short circuit between the positive voltage control circuit and the control circuit of injector 6. Common causes include Wiring harness damage or wear, Faulty fuel injector, Corrosion or poor connections in the injector circuit. 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 Wiring harness damage or wear, Faulty fuel injector, Corrosion or poor connections in the injector circuit.
- 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.
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Code P124D 2018 GMC Sierra Description
The P124D diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates that there is a short circuit between the positive voltage control circuit and the control circuit of injector 6. In simpler terms, this means that there is an electrical issue in the fuel injector system of the vehicle. The fuel injector is responsible for delivering the right amount of fuel into the combustion chamber at the correct time. When there is a short circuit between the positive voltage control circuit and the control circuit of injector 6, it can disrupt the fuel injection process, leading to poor engine performance and potential long-term damage if not addressed promptly.
Common Causes of P124D 2018 GMC Sierra
- Wiring harness damage or wear
- Faulty fuel injector
- Corrosion or poor connections in the injector circuit
- Issues with the Engine Control Module (ECM) or Powertrain Control Module (PCM)
- Water or debris intrusion in the injector system
Symptoms of P124D 2018 GMC Sierra
- Check Engine Light illuminated on the dashboard
- Reduced fuel efficiency
- Rough idling or engine vibrations
- Engine misfires
- Engine stalling or hesitation during acceleration
How to Fix P124D 2018 GMC Sierra
- Begin by conducting a visual inspection of the wiring harness connected to injector 6 to check for any visible damage, wear, or corrosion. Repair or replace any damaged wires.
- Test the fuel injector using a multimeter to check for proper resistance and continuity. Replace the injector if it fails the test.
- Inspect the connections in the injector circuit for corrosion or poor contact. Clean or replace any faulty connections.
- Scan the vehicle's ECM or PCM for any error codes related to the injector system. Reset or reprogram the module if necessary.
- Clear the DTC using an OBD-II scanner and test drive the vehicle to ensure that the issue has been resolved.
Cost to Fix P124D 2018 GMC Sierra
The cost of repairing a P124D code on a 2018 GMC Sierra can vary depending on the specific cause of the issue. On average, the parts required for this repair, such as a new fuel injector or wiring harness, can range from $100 to $500. Labor costs at an auto repair shop typically range from $80 to $150 per hour. The total repair cost, including parts and labor, could amount to $200 to $800. It's important to note that prices may vary based on the location, dealership rates, and the extent of the repair needed. It is recommended to consult with a professional mechanic for an accurate estimate based on the specific circumstances of the vehicle.
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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.
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