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P124A 2015 GMC Sierra Code - Injector 3 Positive Voltage Control Circuit Shorted to Control Circuit

Quick Answer

The P124A diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates that there is a short circuit between the positive voltage control circuit and the control circuit of injector 3. Common causes include Damaged wiring, Faulty fuel injector, Malfunctioning 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 2015 GMC Sierra indicates Injector 3 Positive Voltage Control Circuit Shorted to Control Circuit.
Common causes
Common causes include Damaged wiring, Faulty fuel injector, Malfunctioning 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 17, 2024
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Code P124A 2015 GMC Sierra Description

The P124A diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates that there is a short circuit between the positive voltage control circuit and the control circuit of injector 3. In simpler terms, this means that there is an electrical issue in the wiring that controls the fuel injector for cylinder 3. The fuel injector is responsible for delivering the precise amount of fuel into the combustion chamber at the right time, ensuring proper engine performance.

OBDII Code P124A 2015 GMC Sierra - Injector 3 Positive Voltage Control Circuit Shorted to Control Circuit
P124A 2015 GMC Sierra Code - Injector 3 Positive Voltage Control Circuit Shorted to Control Circuit

Common Causes of P124A 2015 GMC Sierra

  1. Damaged wiring
  2. Faulty fuel injector
  3. Malfunctioning ECM
  4. Poor electrical connection

Symptoms of P124A 2015 GMC Sierra

  1. Rough idling
  2. Misfires
  3. Poor acceleration
  4. Decreased fuel efficiency
  5. Stalling

How to Fix P124A 2015 GMC Sierra

  1. Perform a visual inspection of the wiring harness connected to injector 3 to check for any visible damage or corrosion.
  2. Test the fuel injector for proper functioning and replace if necessary.
  3. Use a multimeter to check the voltage on the positive control circuit and control circuit to identify the short.
  4. Repair or replace any damaged wiring or connectors.
  5. Clear the DTC and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P124A 2015 GMC Sierra

The typical repair costs for addressing a P124A code in a 2015 GMC Sierra can vary depending on the specific cause of the issue. On average, the parts for this repair could range from $50 to $200, while labor costs could be between $100 and $300. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate.

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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 2015 GMC Sierra Code

What does the OBDII code P124A mean for a 2015 GMC Sierra?

P124A indicates that there is a problem with the injector 3 positive voltage control circuit, suggesting a short circuit in the control circuit.

What are the common symptoms of a P124A code?

Common symptoms include poor engine performance, rough idling, increased fuel consumption, and potential engine misfires.

What could cause the P124A code to trigger?

Causes may include a shorted wire in the injector control circuit, a faulty injector, issues with the engine control module (ECM), or poor electrical connections.

How can I diagnose the P124A code?

To diagnose P124A, check the wiring and connectors for damage or corrosion, test the injector for proper operation, and use a multimeter to check for voltage and ground at the injector.

What should I check first if I encounter a P124A code?

Start by visually inspecting the wiring and connectors related to injector 3 for any signs of damage or short circuits.

Can I drive my GMC Sierra with a P124A code?

It's not recommended to drive with a P124A code, as it can lead to engine performance issues and potential damage if not addressed.

What repairs might be needed to fix the P124A code?

Repairs may include replacing damaged wiring, repairing connectors, replacing the faulty injector, or addressing issues within the ECM.

Is it necessary to clear the code after repairs?

Yes, after repairs are made, it's important to clear the code using an OBDII scanner and then perform a test drive to ensure the issue is resolved.

How can I prevent a P124A code from recurring?

To prevent recurrence, regularly inspect electrical connections and wiring for wear and tear, and ensure that maintenance on the fuel system is performed as needed.

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