P124E 2014 GMC Sierra Code - Cylinder 7 Injector High Control Circuit Shorted to Control Circuit
Quick Answer
The P124E diagnostic trouble code (DTC) indicates a malfunction in the fuel injection system, specifically concerning the injector for cylinder 7. Common causes include Shorted Wiring: Damaged or frayed wiring in the injector circuit that leads to a short, Faulty Injector: A malfunctioning injector that may be stuck open or closed, causing abnormal resistance in the circuit, Corroded Connectors: Corrosion at the electrical connectors can lead to poor connectivity and short circuits. 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
- P124E 2014 GMC Sierra indicates Cylinder 7 Injector High Control Circuit Shorted to Control Circuit.
- Common causes
- Common causes include Shorted Wiring: Damaged or frayed wiring in the injector circuit that leads to a short, Faulty Injector: A malfunctioning injector that may be stuck open or closed, causing abnormal resistance in the circuit, Corroded Connectors: Corrosion at the electrical connectors can lead to poor connectivity and short circuits.
- 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 P124E 2014 GMC Sierra Description
The P124E diagnostic trouble code (DTC) indicates a malfunction in the fuel injection system, specifically concerning the injector for cylinder 7. This code signifies that the control circuit for the injector has shorted to the control circuit, which means that there is an unintended connection between the injector's control wire and another circuit. This can lead to excessive current flow to the injector, potentially causing it to operate improperly or remain in a constant open or closed position.
Common Causes of P124E 2014 GMC Sierra
- Shorted Wiring: Damaged or frayed wiring in the injector circuit that leads to a short.
- Faulty Injector: A malfunctioning injector that may be stuck open or closed, causing abnormal resistance in the circuit.
- Corroded Connectors: Corrosion at the electrical connectors can lead to poor connectivity and short circuits.
- ECM Issues: A faulty Engine Control Module that misinterprets signals or fails to control the injector correctly.
- Moisture Intrusion: Water or moisture entering the wiring harness or connectors, leading to electrical shorts.
Symptoms of P124E 2014 GMC Sierra
- Engine Misfire: The vehicle may exhibit rough idling or stalling due to improper fuel delivery to cylinder 7.
- Check Engine Light: The illumination of the check engine light on the dashboard, indicating a fault in the fuel injection system.
- Poor Fuel Economy: A noticeable decrease in fuel efficiency as the engine struggles to maintain optimal performance.
- Increased Emissions: The vehicle may produce higher levels of exhaust emissions, potentially leading to failed emissions tests.
- Rough Acceleration: Hesitation or lack of power during acceleration, particularly when the vehicle is under load.
How to Fix P124E 2014 GMC Sierra
- Visual Inspection: Begin with a thorough visual inspection of the wiring harness and connectors associated with cylinder 7's injector for signs of damage, corrosion, or wear.
- Electrical Testing: Use a multimeter to test the resistance and voltage at the injector connector to determine if the circuit is functioning correctly.
- Replace Damaged Components: If any damaged wiring or connectors are found, repair or replace them as necessary to restore proper function.
- Injector Replacement: If the injector is determined to be faulty, replace it with a new or refurbished unit to ensure proper fuel delivery.
- ECM Reprogramming: If the ECM is suspected to be at fault, consider reprogramming or replacing it, ensuring that it is calibrated for the specific vehicle and engine type.
Cost to Fix P124E 2014 GMC Sierra
The typical repair costs for addressing a P124E code can vary widely based on the specific diagnosis and repairs needed. Generally, the cost may range from $150 to $600, including parts and labor. This estimate includes the potential replacement of wiring, connectors, or the injector itself. Labor rates at auto repair shops can vary significantly based on location, vehicle make and model, and engine type. Most shops charge between $80 and $150 per hour; however, rates may be higher in metropolitan areas or at dealerships, while independent shops may offer lower rates. It is advisable to check local rates for a more precise estimate and to obtain quotes from multiple repair facilities to ensure a fair price.
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Frequently Asked Questions about P124E 2014 GMC Sierra Code
1. What does the OBDII code P124E mean on a 2014 GMC Sierra?
The code P124E indicates a problem with the Cylinder 7 injector high control circuit, specifically that it is shorted to the control circuit.
2. What are the common symptoms of the P124E code?
Symptoms may include rough idling, reduced engine performance, misfires in cylinder 7, poor fuel efficiency, or the Check Engine Light being illuminated.
3. What causes the P124E code to appear?
The main causes include damaged or shorted wiring in the injector circuit, a faulty cylinder 7 fuel injector, a malfunctioning engine control module (ECM), or corroded electrical connections.
4. Can I drive my 2014 GMC Sierra with the P124E code?
It’s not recommended to drive with this code active, as it can lead to further engine damage, misfires, or reduced performance.
5. How do I diagnose the P124E code?
Diagnose the code by inspecting the wiring and connectors for cylinder 7’s injector, testing the injector resistance, checking for shorts to ground, and using a scan tool to analyze live data.
6. How do I fix the P124E code on my GMC Sierra?
Fixes may include repairing or replacing damaged wiring, cleaning or replacing corroded connectors, replacing the cylinder 7 fuel injector, or reprogramming the ECM if needed.
7. How much does it cost to repair the P124E code?
Repair costs vary but typically range from $200 to $600 depending on whether wiring repairs, injector replacement, or ECM reprogramming is required.
8. Can a bad fuel injector cause the P124E code?
Yes, a faulty fuel injector in cylinder 7 can cause the P124E code by creating a short in the control circuit.
9. What tools are needed to troubleshoot the P124E code?
You’ll need a multimeter to check for electrical shorts, a diagnostic scan tool for live data analysis, and possibly a noid light to test injector operation.
10. Does the P124E code require ECM replacement?
ECM replacement is not usually required unless the ECM is confirmed to be damaged or unable to control the injector circuit properly.
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