P124B 2016 GMC Sierra Code - Injector 4 Positive Voltage Control Circuit Shorted to Control Circuit
Quick Answer
The diagnostic trouble code P124B for a 2016 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 in the positive voltage control circuit, Faulty fuel injector, Malfunctioning 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 2016 GMC Sierra indicates Injector 4 Positive Voltage Control Circuit Shorted to Control Circuit.
- Common causes
- Common causes include Damaged wiring in the positive voltage control circuit, Faulty fuel injector, Malfunctioning 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 2016 GMC Sierra Description
The diagnostic trouble code P124B for a 2016 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 fuel injector system that is causing a disruption in the communication between the injector and the vehicle's engine control module (ECM).
Common Causes of P124B 2016 GMC Sierra
- Damaged wiring in the positive voltage control circuit
- Faulty fuel injector
- Malfunctioning engine control module (ECM)
- Corrosion in the electrical connections
- Poor electrical grounding
Symptoms of P124B 2016 GMC Sierra
- Engine misfires
- Rough idling
- Decreased fuel efficiency
- Loss of power
- Check Engine Light illuminated
How to Fix P124B 2016 GMC Sierra
- Diagnose the issue using a scan tool to confirm the P124B code and pinpoint the exact cause of the short circuit.
- Inspect the wiring harness and connections for any damage or corrosion. Repair or replace as needed.
- Test the fuel injector to determine if it is functioning properly. Replace if necessary.
- Check the engine control module (ECM) for any faults or malfunctions. Repair or replace as required.
- Clear the trouble code and test drive the vehicle to ensure that the issue has been resolved.
Cost to Fix P124B 2016 GMC Sierra
The typical repair costs for addressing a P124B code on a 2016 GMC Sierra can vary depending on the specific cause of the issue. In general, the cost of parts such as a new fuel injector or ECM, along with labor for diagnosis and repair, can range from $200 to $800. It's important to note that the actual cost may be higher or lower based on the shop's labor rates, the location, and the extent of the damage. It's recommended to obtain quotes from different auto repair shops to get a more accurate estimate.
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Frequently Asked Questions about P124B 2016 GMC Sierra Code
1. What does the OBDII code P124B mean on a 2016 GMC Sierra?
P124B indicates that the powertrain control module (PCM) has detected a short circuit between the positive voltage control circuit and the control circuit for fuel injector 4.
2. What are the common symptoms of the P124B code?
Common symptoms include rough idling, misfires, reduced engine performance, poor fuel efficiency, and an illuminated check engine light.
3. What causes the P124B code to appear?
Possible causes include damaged or shorted wiring to injector 4, a faulty fuel injector, a defective PCM, or poor electrical connections in the injector circuit.
4. Can I drive my 2016 GMC Sierra with the P124B code?
It’s not recommended to drive with this code active, as it can lead to engine damage, poor performance, or unsafe driving conditions.
5. How do I diagnose the P124B code?
Diagnosis typically involves inspecting the wiring harness for damage, testing the injector 4 circuit for continuity or shorts, and using a scan tool to monitor fuel injector operation.
6. How can I fix the P124B code?
Repairs may involve replacing damaged wiring, repairing electrical connections, replacing the faulty injector 4, or reprogramming/repairing the PCM if necessary.
7. How much does it cost to repair the P124B code?
Repair costs vary depending on the issue. Fixing wiring or connections may cost $100-$300, while replacing an injector or PCM can cost $500-$1000 or more.
8. Can a dirty or clogged injector cause the P124B code?
No, this code specifically refers to an electrical issue in the injector circuit, not a mechanical clogging issue.
9. What tools are needed to troubleshoot the P124B code?
You’ll need a multimeter to test wiring, a scan tool to read live data and codes, and possibly a wiring diagram for the vehicle.
10. Can a bad PCM cause the P124B code?
Yes, a faulty PCM could potentially cause this code if it fails to properly control the injector 4 circuit. However, this is less common and should be diagnosed after ruling out wiring and injector issues.
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