P124B 2015 GMC Sierra Code - Injector 4 Positive Voltage Control Circuit Shorted to Control Circuit
Quick Answer
The P124B 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 4. Common causes include Wiring or connector damage: The most common cause of this code is damage to the wiring or connectors associated with injector 4, This could be due to wear and tear, corrosion, or rodent damage, Injector 4 failure: A malfunctioning fuel injector itself could also be the cause of the short 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
- P124B 2015 GMC Sierra indicates Injector 4 Positive Voltage Control Circuit Shorted to Control Circuit.
- Common causes
- Common causes include Wiring or connector damage: The most common cause of this code is damage to the wiring or connectors associated with injector 4, This could be due to wear and tear, corrosion, or rodent damage, Injector 4 failure: A malfunctioning fuel injector itself could also be the cause of the short 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 P124B 2015 GMC Sierra Description
The P124B 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 4. This means that there is a problem with the wiring or connectors associated with the fuel injector for cylinder 4. Fuel injectors are essential components of a vehicle's fuel injection system that deliver fuel into the combustion chamber in precise amounts and at specific times. In this case, the short circuit is causing a disruption in the proper operation of the injector, leading to potential performance issues.
Common Causes of P124B 2015 GMC Sierra
- Wiring or connector damage: The most common cause of this code is damage to the wiring or connectors associated with injector 4. This could be due to wear and tear, corrosion, or rodent damage.
- Injector 4 failure: A malfunctioning fuel injector itself could also be the cause of the short circuit.
- Engine control module (ECM) failure: A fault in the ECM that controls the fuel injector circuits could trigger this code.
- Short circuit in the wiring harness: A short circuit in the wiring harness that connects the injector to the ECM could also be to blame.
- Electrical interference: External factors such as electromagnetic interference or poor grounding could also lead to a short circuit.
Symptoms of P124B 2015 GMC Sierra
- Engine misfires or rough idling
- Decreased fuel efficiency
- Poor acceleration
- Stalling
- Check engine light illuminated
How to Fix P124B 2015 GMC Sierra
- Diagnose the issue: Use a scan tool to confirm the presence of the P124B code and inspect the wiring, connectors, and injector 4 for any visible damage.
- Repair or replace damaged wiring or connectors: If any wiring or connectors are damaged, repair or replace them as needed.
- Test the fuel injector: Test the functionality of injector 4 to determine if it needs to be replaced.
- Check the ECM: Inspect the ECM for any faults or errors and address them accordingly.
- Clear the code: Clear the DTC from the vehicle's memory using a scan tool after completing the repairs.
Cost to Fix P124B 2015 GMC Sierra
The cost of repairing a P124B code on a 2015 GMC Sierra can vary depending on the extent of the damage and the specific repairs needed. In general, the cost of parts such as wiring, connectors, and a new fuel injector can range from $100 to $500. Labor costs can add another $100 to $300 to the total repair bill. Overall, the total cost of addressing this issue could fall between $200 and $800, but it's important to consult with a qualified mechanic or auto repair shop for a more accurate estimate based on your specific vehicle and location. Labor rates at auto repair shops typically range from $80 to $150 per hour, but rates may vary based on the shop's location and expertise.
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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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