What Is Car Fault Code P0124? Diagnose & Clear It with iCarsoft CR Pro S
If your check engine light illuminates and your diagnostic tool retrieves P0124, you’re facing an issue with your vehicle’s Throttle Position Sensor (TPS) or electronic throttle control system. The TPS monitors the throttle valve’s position to optimize fuel injection and engine performance—this code signals an intermittent or erratic signal from the sensor circuit. Ignoring P0124 can lead to rough idling, hesitation during acceleration, poor fuel efficiency, or even engine stalling. In this guide, we’ll break down what P0124 means, why it occurs, and how the iCarsoft CR Pro S—your all-in-one diagnostic solution—can help you resolve it efficiently.
iCarsoft CR Pro S testing TPS circuit & electronic throttle control system to diagnose P0124 fault code
What Exactly Is Fault Code P0124?
P0124 is a generic OBD-II trouble code defined as “Throttle Position Sensor (TPS) A Circuit Intermittent”. The TPS sends real-time voltage signals to the ECU (Engine Control Unit) as the throttle opens or closes. When the ECU detects inconsistent, fluctuating, or unexpected signals from the TPS circuit (not a constant high or low, but intermittent disruptions), it triggers P0124.
This code applies to gasoline, diesel, and hybrid vehicles with electronic throttle control systems. Left unaddressed, it may cause the ECU to default to a safe mode, limiting engine power to protect critical components.
Why Does P0124 Happen? Common Causes
P0124 typically stems from issues with the TPS or its related control system:
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Faulty Throttle Position Sensor (TPS): Internal wear, contamination, or electrical defects cause intermittent signal transmission.
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Wiring/Connector Issues: Damaged, frayed, or shorted wires, or a loose/corroded connector between the TPS and ECU.
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Dirty or Stuck Throttle Body: Carbon buildup restricts throttle valve movement, disrupting the TPS’s ability to detect position.
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Failed Electronic Throttle Control Module: Malfunctions in the module that regulates throttle operation affect TPS signal processing.
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Low Battery Voltage: Unstable electrical power causes erratic TPS readings.
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ECU Malfunction: Rarely, the engine control unit fails to interpret the TPS signal correctly.
Why the iCarsoft CR Pro S Is Ideal for P0124
When it comes to diagnosing and fixing P0124, the iCarsoft CR Pro S outperforms basic scanners by offering deep throttle control system insights and global compatibility. Here’s why it’s your best tool:
Full Throttle System Scans
Unlike basic scanners that only read the code, the CR Pro S dives into the TPS circuit, checking the sensor, wiring, throttle body, and control module.
Live Data Monitoring
View real-time TPS voltage fluctuations and throttle position data to verify intermittent signal issues.
Bi-directional Control
Test the TPS and electronic throttle body by sending commands—confirm if components operate consistently without disassembly.
Global Vehicle Support
Works with over 60 makes (Ford, Toyota, BMW, Mercedes-Benz, VW, etc.)—P0124 is no match for its wide compatibility with gasoline, diesel, and hybrid vehicles.
One-Click Code Clear
After fixing the issue, erase P0124 and turn off the check engine light in seconds.
Lifetime Free Updates
Stay compatible with new throttle control system designs and code definitions.
Feedback Function
Get customized repair suggestions from certified professionals tailored to your car’s make and model.
How to Diagnose & Fix P0124 with the CR Pro S (Step-by-Step)
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1. Connect the CR Pro S
Plug the tool into your car’s OBD-II port (under the dashboard) and turn on the ignition.
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2. AutoVIN Identify
The tool automatically detects your vehicle’s details—no manual entry needed.
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3. Scan for Codes
Select “Full System Scan” or “Engine System Scan” to retrieve P0124 and related codes (e.g., P0121 for TPS circuit range issues, P0122 for low input).
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4. Check Live Data
Monitor TPS voltage while operating the throttle—fluctuating or inconsistent values confirm an intermittent signal problem.
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5. Test Components
Use bi-directional control to activate the throttle body and TPS—if the signal remains erratic with intact wiring, the TPS or throttle body is faulty.
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6. Fix the Root Cause
Replace the TPS, repair wiring, clean the throttle body, or service the electronic throttle control module (based on your findings).
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7. Clear the Code
Use the “Erase Codes” function to reset P0124 and the check engine light.
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8. Re-Scan & Verify
Run a follow-up scan after driving to ensure the code doesn’t return—confirm the throttle control system is working consistently.
FAQs About P0124 & the iCarsoft CR Pro S
Q: Can I drive with P0124?
A: You can drive short distances, but stalling or acceleration hesitation risks make long trips unsafe. Diagnose promptly with the CR Pro S.
Q: Will the CR Pro S work with my car to diagnose P0124?
A: Yes! The CR Pro S supports over 60 global makes and all 1996+ OBD-II compliant vehicles with electronic throttle control systems.
Q: Do I need mechanical experience to use the CR Pro S for P0124?
A: No! The tool’s 5-inch touchscreen, AutoVIN function, and clear instructions make it user-friendly for beginners. It highlights throttle system components for easy reference.
Q: Can the CR Pro S distinguish between a faulty TPS and wiring issues?
A: Absolutely. Live data shows TPS voltage—intermittent signals with wire movement indicate wiring problems; erratic values with intact wires point to a faulty TPS.
Q: After fixing P0124, will the CR Pro S clear the code permanently?
A: Yes—once the root cause (e.g., faulty TPS, dirty throttle body) is addressed, the “Erase Codes” function clears P0124 permanently. If it returns, the issue wasn’t fully resolved.
Q: Is the CR Pro S better than a basic scanner for P0124?
A: Basic scanners only show P0124—they can’t monitor live TPS voltage or test throttle components. The CR Pro S identifies why the signal is intermittent, saving you from unnecessary part replacements.
Q: Does the CR Pro S support hybrid vehicles with P0124?
A: Yes! Hybrids rely on electronic throttle control, and the CR Pro S includes specialized hybrid diagnostic functions to handle P0124.
Q: How often should I update the CR Pro S for P0124 diagnostics?
A: The CR Pro S offers lifetime free Wi-Fi updates—update every 3–6 months to ensure compatibility with new throttle control technologies and code definitions.
Final Thoughts: Don’t Let P0124 Disrupt Your Engine’s Performance
Fault code P0124 directly impacts your vehicle’s acceleration and efficiency. With the iCarsoft CR Pro S, you can diagnose and fix it from your garage—no expensive dealership visits required. Its deep throttle system coverage, live data monitoring, and bi-directional control take the guesswork out of resolving intermittent signal issues, whether you’re a DIY enthusiast or professional mechanic.
Invest in the iCarsoft CR Pro S today to tackle P0124 and hundreds of other engine-related codes—keep your car accelerating smoothly and running reliably.
