P124B 2017 GMC Sierra Code - Injector 4 Positive Voltage Control Circuit Shorted to Control Circuit
Quick Answer
The P124B diagnostic trouble code (DTC) for a 2017 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 Damaged wiring or connectors, Faulty fuel injector, Defective 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
- P124B 2017 GMC Sierra indicates Injector 4 Positive Voltage Control Circuit Shorted to Control Circuit.
- Common causes
- Common causes include Damaged wiring or connectors, Faulty fuel injector, Defective 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.
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Code P124B 2017 GMC Sierra Description
The P124B diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates that there is a short circuit between the positive voltage control circuit and the control circuit of injector 4. In simpler terms, this means that there is an electrical issue in the wiring that controls the fuel injector for cylinder 4 of the engine. The fuel injector is responsible for delivering the precise amount of fuel into the combustion chamber at the right time. When there is a short circuit in the control circuit, it can disrupt this process and lead to various performance issues.
Common Causes of P124B 2017 GMC Sierra
- Damaged wiring or connectors
- Faulty fuel injector
- Defective engine control module (ECM)
- Poor electrical connection
- Corrosion or moisture in the wiring harness
Symptoms of P124B 2017 GMC Sierra
- Engine misfires
- Rough idling
- Hesitation or lack of power
- Decreased fuel efficiency
- Engine stalling or failure to start
How to Fix P124B 2017 GMC Sierra
- Perform a visual inspection of the wiring harness and connectors to check for any damage or corrosion.
- Test the fuel injector for proper operation using a multimeter.
- Check the ECM for any fault codes and ensure it is functioning correctly.
- Repair or replace any damaged wiring, connectors, or components as needed.
- Clear the DTC and test drive the vehicle to verify that the issue has been resolved.
Cost to Fix P124B 2017 GMC Sierra
The cost of repairing a P124B code on a 2017 GMC Sierra can vary depending on the specific cause of the issue and the labor rates in your area. In general, the repair may involve replacing damaged wiring, connectors, or the fuel injector, which can range from $200 to $500 for parts. Labor costs can add an additional $100 to $300, with total repair costs typically falling between $300 and $800. It's important to consult with a qualified mechanic to get an accurate estimate based on your vehicle's specific needs and local labor rates.
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Frequently Asked Questions about P124B 2017 GMC Sierra Code
1. What does the OBDII code P124B mean on a 2017 GMC Sierra?
P124B indicates that the Injector 4 Positive Voltage Control Circuit is shorted to the control circuit, meaning there is an electrical issue with the fuel injector's wiring or components.
2. What are the common symptoms of code P124B on a 2017 GMC Sierra?
Symptoms may include rough idling, reduced engine performance, misfiring, poor fuel economy, or the Check Engine Light being illuminated.
3. What causes the P124B code to appear on a 2017 GMC Sierra?
Common causes include damaged or corroded wiring, a short circuit in the injector circuit, a faulty fuel injector, or a malfunctioning powertrain control module (PCM).
4. Can I drive my 2017 GMC Sierra with a P124B code?
Driving with this code is not recommended, as it can cause poor performance, increased emissions, and potential engine damage if not addressed promptly.
5. How do I diagnose a P124B code on a 2017 GMC Sierra?
Start by inspecting the wiring and connections for Injector 4, looking for damage or corrosion. Use a multimeter to check continuity and voltage, and test the injector for proper function.
6. How do I fix the P124B code on a 2017 GMC Sierra?
Repair or replace any damaged wiring, connectors, or the injector itself. If the issue persists, further diagnostics may be needed to check the PCM or related circuits.
7. How much does it cost to repair the P124B code on a 2017 GMC Sierra?
Repair costs can vary but typically range from $150 to $500, depending on whether the issue is with wiring, the injector, or other components.
8. Can a bad PCM cause the P124B code on a 2017 GMC Sierra?
Yes, a malfunctioning PCM can cause this code, but it is less common. Always rule out wiring and injector issues before suspecting the PCM.
9. Will clearing the P124B code fix the issue on a 2017 GMC Sierra?
Clearing the code will temporarily turn off the Check Engine Light, but the issue will return if the underlying problem is not addressed.
10. Is the P124B code specific to Injector 4 on a 2017 GMC Sierra?
Yes, this code specifically pertains to the positive voltage control circuit for Injector 4. Other injectors would trigger similar codes with different numbers.
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