P0124 – OBD-II DTC

OBD-II DTC P0124 – Throttle Position Sensor/Switch A Circuit Intermittent

DTC P0124 meaning

DTC P0124 refers to an issue with the Throttle Position Sensor (TPS) or switch A circuit, indicating that there is an intermittent problem. The TPS is crucial for monitoring the position of the throttle plate in the engine, which helps the engine control module (ECM) manage air intake and fuel delivery. An intermittent fault suggests that the signal from the TPS is not consistently reliable, which can lead to erratic engine performance.

DTC P0124 symptoms

Common symptoms associated with DTC P0124 may include:

• Check Engine Light (CEL) illuminated
• Erratic engine idle
• Reduced engine power or acceleration
• Stalling or hesitation during acceleration
• Poor fuel economy

DTC P0124 causes

Several factors can lead to the triggering of DTC P0124, including:

• Faulty Throttle Position Sensor
• Wiring issues, such as frayed or damaged wires
• Corroded or loose electrical connectors
• Faulty engine control module (ECM)
• Vacuum leaks affecting throttle response

DTC P0124 seriousness

DTC P0124 can be considered serious as it may affect engine performance and drivability. If left unaddressed, it can lead to further complications, such as increased emissions, poor fuel efficiency, and potential engine damage. It is advisable to diagnose and repair the issue promptly to ensure safe and efficient vehicle operation.

How to diagnose DTC P0124

To diagnose DTC P0124, follow these steps:

1. Use an OBD-II scanner to confirm the DTC and check for any additional codes.
2. Inspect the Throttle Position Sensor and its wiring for visible damage or corrosion.
3. Check the electrical connectors for tightness and cleanliness.
4. Test the TPS using a multimeter to ensure it is functioning within specifications.
5. Examine the vacuum lines for leaks that may affect throttle performance.
6. Clear the DTC and take the vehicle for a test drive to see if the code reappears.

How to fix DTC P0124 step-by-step instructions

To fix DTC P0124, follow these steps:

1. Disconnect the battery to ensure safety while working on electrical components.
2. Inspect and repair any damaged wiring or connectors related to the TPS.
3. If the TPS is faulty, replace it with a new one, ensuring it is properly calibrated.
4. Reconnect any electrical connectors and ensure they are secure.
5. Reconnect the battery and clear the DTC using an OBD-II scanner.
6. Perform a test drive to verify that the issue has been resolved and the DTC does not reappear.

How to erase DTC P0124

To erase DTC P0124, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn on the ignition without starting the engine.
3. Navigate to the “Erase Codes” or “Clear DTCs” option on the scanner.
4. Confirm the action to clear the codes from the ECM.
5. Disconnect the scanner and start the engine to ensure the code does not return.

Recommended tools for OBD-II diagnostics

Explore our expert picks: The Best OBD2 Scanners for 2025

Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter

Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.