P124B 2015 GMC Sierra Code - Injector 4 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 4, Fuel Injector 4 harness is open or shorted, Fuel Injector 4 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
- P124B 2015 GMC Sierra indicates Injector 4 Positive Voltage Control Circuit Shorted to Control Circuit.
- Common causes
- Common causes include Faulty Fuel Injector 4, Fuel Injector 4 harness is open or shorted, Fuel Injector 4 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 P124B 2015 GMC Sierra Description
What are the Possible Causes of the DTC P124B 2015 GMC Sierra?
- Faulty Fuel Injector 4
- Fuel Injector 4 harness is open or shorted
- Fuel Injector 4 circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P124B 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 P124B 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 P124B 2015 GMC Sierra Code
1. What does the OBDII code P124B mean on a 2015 GMC Sierra?
P124B indicates an issue with Injector 4’s positive voltage control circuit, specifically a short to the control circuit.
2. What are the common symptoms of code P124B?
Symptoms may include rough idling, reduced engine performance, misfires, poor fuel economy, and the check engine light being illuminated.
3. What causes code P124B to appear on a 2015 GMC Sierra?
Common causes include damaged wiring or connectors for Injector 4, a faulty fuel injector, or a malfunctioning powertrain control module (PCM).
4. Can a faulty injector cause the P124B code?
Yes, a faulty Injector 4 can cause the P124B code if it is internally shorted or otherwise malfunctioning.
5. How can I diagnose the P124B code?
Start by inspecting Injector 4’s wiring and connections for damage or corrosion. Use a multimeter to check for shorts or continuity issues in the circuit, and test the injector itself for proper operation.
6. Is it safe to drive a 2015 GMC Sierra with the P124B code?
Driving with the P124B code is not recommended as it can lead to engine misfires, reduced performance, and potential engine damage over time.
7. How can I fix the P124B code on my GMC Sierra?
Repairs may include replacing damaged wiring or connectors, replacing Injector 4 if it is faulty, or reprogramming or replacing the PCM if necessary.
8. How much does it cost to repair the P124B code?
Repair costs can vary, but replacing a fuel injector typically costs $200–$400, while wiring repairs or PCM replacement can increase costs depending on the extent of the issue.
9. Can a bad PCM cause the P124B code on a 2015 GMC Sierra?
Yes, a malfunctioning PCM can cause the P124B code if it fails to properly control Injector 4’s voltage circuit.
10. Will clearing the code fix the P124B issue?
Clearing the code will turn off the check engine light temporarily, but if the underlying issue isn’t resolved, the code will return.
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