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Engine-Codes – GMC – P124A 2017 GMC Sierra

P124A 2017 GMC Sierra Code - Injector 3 Positive Voltage Control Circuit Shorted to Control Circuit

Quick Answer

The P124A diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates a problem with the Injector 3 Positive Voltage Control Circuit being shorted to the Control Circuit. Common causes include Short circuit in the wiring harness, Faulty fuel injector, Issue 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
P124A 2017 GMC Sierra indicates Injector 3 Positive Voltage Control Circuit Shorted to Control Circuit.
Common causes
Common causes include Short circuit in the wiring harness, Faulty fuel injector, Issue 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.
What is this?
Table of contents Created and updated by William Orellana on Sep 11, 2024
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Code P124A 2017 GMC Sierra Description

The P124A diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates a problem with the Injector 3 Positive Voltage Control Circuit being shorted to the Control Circuit. In simpler terms, this means that there is an issue with the electrical signals that control the fuel injector for cylinder 3 in the engine. The fuel injector is responsible for delivering the precise amount of fuel into the combustion chamber at the right time to ensure optimal engine performance.

OBDII Code P124A 2017 GMC Sierra - Injector 3 Positive Voltage Control Circuit Shorted to Control Circuit
P124A 2017 GMC Sierra Code - Injector 3 Positive Voltage Control Circuit Shorted to Control Circuit

Common Causes of P124A 2017 GMC Sierra

  1. Short circuit in the wiring harness
  2. Faulty fuel injector
  3. Issue with the engine control module (ECM)
  4. Poor connection in the electrical system
  5. Corrosion or damage to the electrical components

Symptoms of P124A 2017 GMC Sierra

  1. Engine misfires or runs rough
  2. Reduced power or acceleration
  3. Poor fuel economy
  4. Engine may fail to start
  5. Check Engine Light illuminated on the dashboard

How to Fix P124A 2017 GMC Sierra

  1. Begin by conducting a thorough inspection of the wiring harness, connectors, and fuel injector for any visible damage or signs of a short circuit.
  2. Use a multimeter to test the continuity and resistance of the wiring to identify any issues with the circuit.
  3. Inspect the fuel injector for proper operation and replace it if necessary.
  4. Check the engine control module (ECM) for any faults or errors and reprogram or replace it as needed.
  5. Clear the DTC from the vehicle's memory using a diagnostic scan tool and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P124A 2017 GMC Sierra

The cost of repairing a P124A code on a 2017 GMC Sierra can vary depending on the specific cause of the issue. In general, the cost of parts such as a new fuel injector or engine control module can range from $200 to $600. Labor costs at an auto repair shop typically range from $80 to $150 per hour, with the total repair time estimated at 1-2 hours. Therefore, the total repair cost could range from $300 to $900, including parts and labor. It's advisable to consult with a professional mechanic for a more accurate estimate based on your specific vehicle and location.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P124A 2017 GMC Sierra Code

1. What does the OBDII code P124A mean on a 2017 GMC Sierra?

P124A indicates that the Injector 3 Positive Voltage Control Circuit is shorted to the control circuit, meaning there is an electrical issue affecting the injector's function.

2. What are the common symptoms of code P124A in a 2017 GMC Sierra?

Symptoms include rough idling, engine misfires, reduced fuel efficiency, decreased engine performance, or the engine failing to start.

3. What causes the P124A code to appear in a 2017 GMC Sierra?

Common causes include damaged wiring or connectors for injector 3, a faulty fuel injector, a short circuit, or an issue with the Powertrain Control Module (PCM).

4. Can a faulty injector cause the P124A code?

Yes, a malfunctioning fuel injector, particularly Injector 3, can cause this code due to electrical issues within the injector.

5. How do I diagnose the P124A code on a 2017 GMC Sierra?

Start by inspecting the wiring and connectors for Injector 3, check for signs of damage or corrosion, and use a multimeter to test for continuity or short circuits. If no issues are found, test the injector itself or the PCM.

6. Can I drive my 2017 GMC Sierra with a P124A code?

It’s not recommended to drive with this code, as it may lead to engine misfires, reduced performance, and potentially damage other components.

7. How much does it cost to fix the P124A code on a 2017 GMC Sierra?

Repair costs vary depending on the root cause. Replacing a damaged injector can cost $200–$500, while wiring repairs may be less. PCM replacement is more expensive, ranging from $500–$1200.

8. Does the P124A code mean the PCM is faulty?

Not necessarily. While a faulty PCM can cause the P124A code, it’s less common. Electrical issues like damaged wiring or a bad injector are more likely.

9. How do I reset the P124A code after repairs?

After fixing the issue, clear the code using an OBDII scanner. Drive the vehicle to ensure the code does not return.

10. Can cleaning the injector fix the P124A code?

Cleaning alone may not resolve the issue if the problem is electrical. However, if the injector is clogged and causing related symptoms, cleaning could help improve performance.

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