P0124 medium Severity

P0124: Throttle/Pedal Position Sensor/Switch "A" Circuit Intermittent

May cause erratic throttle response, hesitation, reduced power, unstable idle, or limp-home mode due to intermittent sensor signal

Overview

P0124 Throttle/Pedal Position Sensor A Circuit Intermittent fault code meaning causes intermittent signal from throttle or accelerator pedal position sensor to PCM

Common Symptoms

  • Check Engine Light illuminated
  • Erratic throttle response or hesitation during acceleration
  • Reduced engine power or unstable idle
  • Occasional stalling or improved limp mode behavior

Most Common Causes

Faulty throttle position sensor (TPS) or pedal position sensor (PPS) high

Intermittent output from sensor due to internal wear or failure

Damaged or corroded wiring/connectors in the TPS/PPS circuit high

Loose, frayed, or corroded connector terminals leading to intermittent signals

Intermittent power or ground supply to the sensor medium

Poor ground or intermittent 5V reference feed can trigger intermittent readings

PCM internal fault or calibration issue low

Less common but possible, especially after firmware updates or electrical events

Diagnostic Steps

  1. Connect an OBD-II scanner and confirm P0124 plus check for other related codes
    Expected: P0124 present and freeze frame/live data available
    Interpretation: Confirms code and gives context for diagnostic focus
  2. Visually inspect wiring harness and connectors for the throttle/pedal position sensor
    Expected: No frayed wires, corrosion, or loose connector pins
    Interpretation: If defects found, likely cause; repair and retest
  3. Perform a wiggle test on wiring/connectors while monitoring live TPS voltage
    Expected: Stable voltage signal without dropouts
    Interpretation: Voltage dropouts indicate intermittent wiring/connector issue
  4. Measure TPS output voltage from closed to open throttle with a multimeter
    Expected: Smooth linear voltage change ~0.5V to ~4.5V
    Interpretation: Non-linear or sudden jumps indicate sensor fault
  5. Replace TPS/PPS if sensor output tests out of specification and retest
    Expected: TPS voltage behavior normal and code does not reappear
    Interpretation: Successful repair if code clears and symptoms resolved

Repair Solutions

Repair wiring harness/connectors (clean, secure, replace damaged wiring) medium
Estimated Cost: $50 - $200

Effective if intermittent signal is due to electrical connection faults

Replace throttle position sensor (TPS) or pedal position sensor (PPS) medium
Estimated Cost: $100 - $300

Replace only after verifying sensor failure via testing

Reprogram or replace PCM (if confirmed faulty) hard
Estimated Cost: $300 - $800

Only if all other causes eliminated and manufacturer guidance supports it

Common Misdiagnoses

Avoid these common diagnostic mistakes:

  • Replacing the TPS without addressing wiring or connector issues first

Frequently Asked Questions

What does the P0124 code mean?

When your OBD-II scanner reads P0124, it means: Throttle/Pedal Position Sensor/Switch "A" Circuit Intermittent. This code is related to the vehicle's Air Intake.

Is it safe to drive with a P0124 code?

The P0124 code is considered medium severity. May cause erratic throttle response, hesitation, reduced power, unstable idle, or limp-home mode due to intermittent sensor signal

How do I know if I have code P0124?

Common symptoms include: Check Engine Light illuminated, Erratic throttle response or hesitation during acceleration, Reduced engine power or unstable idle. You might also notice the Check Engine Light is on.

What causes the P0124 code?

It can be caused by several factors, most notably: Faulty throttle position sensor (TPS) or pedal position sensor (PPS), Damaged or corroded wiring/connectors in the TPS/PPS circuit, Intermittent power or ground supply to the sensor.

Is P0124 expensive to fix?

Repair costs depend on the specific failure. A simple Repair wiring harness/connectors (clean, secure, replace damaged wiring) replacement is relatively affordable ($50-$200), whereas a Reprogram or replace PCM (if confirmed faulty) repair is more expensive, potentially reaching $800.

Does code P0124 apply to Honda vehicles?

P0124 is not specific to any one brand. It can appear on Ford, Dodge, Toyota, Honda, Jeep, and other vehicles.

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