P124B 2018 GMC Sierra Code - Injector 4 Positive Voltage Control Circuit Shorted to Control Circuit
Quick Answer
The diagnostic trouble code P124B for a 2018 GMC Sierra indicates that there is a problem with the injector 4 positive voltage control circuit being shorted to the control circuit. Common causes include Damaged wiring or connectors related to injector 4, Malfunctioning injector, Issues 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
- P124B 2018 GMC Sierra indicates Injector 4 Positive Voltage Control Circuit Shorted to Control Circuit.
- Common causes
- Common causes include Damaged wiring or connectors related to injector 4, Malfunctioning injector, Issues 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.
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Code P124B 2018 GMC Sierra Description
The diagnostic trouble code P124B for a 2018 GMC Sierra indicates that there is a problem with the injector 4 positive voltage control circuit being shorted to the control circuit. Injectors are crucial components of a vehicle's fuel system as they are responsible for delivering the right amount of fuel into the engine cylinders for combustion. In this case, the issue is specifically related to injector 4, which can lead to various performance issues.
Common Causes of P124B 2018 GMC Sierra
- Damaged wiring or connectors related to injector 4
- Malfunctioning injector
- Issues with the Engine Control Module (ECM)
- Corrosion or water damage in the electrical system
- Short circuit in the wiring harness
Symptoms of P124B 2018 GMC Sierra
- Engine misfires
- Rough idling
- Poor acceleration
- Decreased fuel efficiency
- Stalling
How to Fix P124B 2018 GMC Sierra
- Perform a thorough inspection of the wiring and connectors related to injector 4.
- Test the injector for proper operation and replace if necessary.
- Check the Engine Control Module (ECM) for any faults and reprogram if needed.
- Repair any damaged wiring or connectors in the circuit.
- Clear the fault codes and test drive the vehicle to ensure the issue has been resolved.
Cost to Fix P124B 2018 GMC Sierra
The typical repair costs for resolving a P124B code can vary depending on the extent of the issue and the specific components that need to be replaced. In general, the repair costs for this type of issue can range from $200 to $500, including parts and labor. However, it is important to note that labor rates and part prices can vary significantly based on the location of the auto repair shop, the make and model of the vehicle, and the complexity of the repair. It is recommended to obtain quotes from multiple repair shops to get a more accurate estimate for this repair.
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Frequently Asked Questions about P124B 2018 GMC Sierra Code
1. What does the OBDII code P124B mean on a 2018 GMC Sierra?
P124B indicates that the Injector 4 Positive Voltage Control Circuit is shorted to its Control Circuit, preventing proper operation of injector 4.
2. What are the common symptoms of code P124B in a 2018 GMC Sierra?
Symptoms may include engine misfires, rough idling, reduced power, poor fuel efficiency, and the check engine light turning on.
3. What causes the P124B code to appear in a 2018 GMC Sierra?
Common causes include damaged wiring or connectors for injector 4, a faulty injector, short circuits, or issues with the Powertrain Control Module (PCM).
4. Can I drive my 2018 GMC Sierra with a P124B code?
Driving with this code is not recommended, as it may lead to poor engine performance, further damage to the injector system, or increased emissions.
5. How do I diagnose the P124B code in a 2018 GMC Sierra?
Start by inspecting the wiring and connectors for injector 4 for damage or corrosion. Use a multimeter to check for short circuits, and test the injector for proper operation.
6. How can I fix the P124B code on my 2018 GMC Sierra?
Repairs may include replacing damaged wiring, repairing corroded connectors, replacing injector 4, or reprogramming or replacing the PCM if it's determined to be faulty.
7. How much does it cost to repair a P124B code on a 2018 GMC Sierra?
Repair costs can vary depending on the issue. Injector replacements may cost $200-$500, while PCM repairs or replacements may cost $500-$1,200, excluding labor.
8. Can a bad fuel injector cause the P124B code in a 2018 GMC Sierra?
Yes, a faulty injector 4 can cause this code by disrupting the voltage or control circuit operation.
9. Does clearing the P124B code solve the problem in a 2018 GMC Sierra?
Clearing the code without addressing the underlying issue will not fix the problem, and the code will likely return.
10. What tools are needed to diagnose and fix the P124B code on a 2018 GMC Sierra?
You’ll need an OBDII scanner, a multimeter, and possibly wiring repair tools or an injector tester to diagnose and resolve the issue.
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