OBD-II Generic Error Code P2124: How to Fix It

Medium 45 minutes to 2 hours Medium Severity Verified June 2026
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Error Code
P2124
Brand
OBD-II Generic
Product Type
automotive
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
45 minutes to 2 hours
Error code P2124 indicates that the Engine Control Module (ECM) has detected an intermittent signal from the accelerator pedal position sensor D. This can cause issues with throttle response, such as hesitation, surging, or limp mode. The problem is often due to a faulty sensor, wiring issues, or a poor connection.
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Tools You'll Need

How to Fix Error Code P2124

  1. Safety First and Initial Checks

    Always disconnect the battery before working on electrical components to avoid injury or damage.

  2. Retrieve and Clear Codes

  3. Check Accelerator Pedal Connector

    Do not force the connector; use a small pick if needed to adjust pins.

  4. Test Sensor Voltage

    Be careful not to short pins; use back-probing technique if possible.

  5. Inspect Wiring and Grounds

    Do not perform continuity tests on live circuits; always disconnect the negative battery cable.

  6. Replace Accelerator Pedal Position Sensor (if necessary)

    Some vehicles require recalibration after sensor replacement; consult the service manual.

Parts You May Need

Accelerator pedal position sensor (or pedal assembly)
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Accelerator pedal position sensor (or pedal assembly)
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Accelerator pedal position sensor (or pedal assembly)
Check Price on Amazon
Accelerator pedal position sensor (or pedal assembly)
Check Price on Amazon
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When to Call a Professional

If the steps above do not resolve the code, or if you are uncomfortable working with electronics, consult a professional mechanic. Intermittent issues can be tricky; a dealer or shop may have advanced diagnostic tools to pinpoint the cause.

Frequently Asked Questions

Can I drive with error code P2124?
It is not recommended. The vehicle may enter limp mode, limiting speed and acceleration, which can be dangerous in traffic. Fix the issue promptly.
Will clearing the code fix P2124?
Clearing the code only temporarily removes the warning. If the underlying issue is not fixed, the code will return.
How much does it cost to fix code P2124?
If you DIY, a new accelerator pedal sensor costs $50-$200. A shop diagnosis and repair can range from $150 to $500.
Is P2124 the same as P2122 or P2123?
No. P2122 is circuit low, P2123 is circuit high. P2124 indicates intermittent signal. Each may have different causes.
What other codes commonly appear with P2124?
Related throttle position sensor or accelerator pedal sensor codes like P2120, P2121, P2122, or P2123 may also appear.

Related Error Codes