P124B Buick 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 Buick 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 Buick Description
What are the Possible Causes of the DTC P124B Buick?
- 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 Buick?
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 Buick 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 Buick Code
1. What does the OBDII code P124B mean on a Buick?
P124B indicates an issue with the injector 4 positive voltage control circuit, specifically a short between the control circuit and the positive voltage circuit.
2. What are the common symptoms of code P124B in a Buick?
Common symptoms include rough idling, engine misfires, reduced power, poor fuel economy, and the Check Engine Light illuminating.
3. What causes the P124B code to appear in a Buick?
The code can be caused by a shorted injector, damaged wiring or connectors, a malfunctioning Engine Control Module (ECM), or corrosion in the injector circuit.
4. How do you diagnose a P124B code in a Buick?
Diagnosis involves inspecting the injector 4 wiring and connectors for damage, testing the injector for proper resistance, and checking for shorts or continuity issues in the circuit.
5. Can I drive my Buick with a P124B code?
Driving with this code is not recommended, as it can lead to poor performance, potential engine damage, and reduced fuel efficiency.
6. How can I fix the P124B code on my Buick?
Repairs may include replacing the faulty injector, repairing or replacing damaged wiring or connectors, cleaning corroded connections, or updating/replacing the ECM if necessary.
7. How much does it cost to fix a P124B code in a Buick?
Repair costs vary but typically range from $150 to $500, depending on whether you need a new injector, wiring repairs, or ECM replacement.
8. Can a dirty fuel injector cause the P124B code?
No, a dirty injector usually causes performance issues but doesn’t cause this code. P124B specifically relates to a short in the injector 4 circuit.
9. Will resetting the Check Engine Light fix code P124B?
Resetting the light without addressing the issue will not fix the problem, and the code will likely return.
10. Is code P124B specific to Buick vehicles?
No, the code can occur on other vehicles with similar injector circuit designs, but the troubleshooting steps may vary slightly by make and model.
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