P0124 — Throttle/Pedal Position Sensor/Switch A Circuit Intermittent

What P0124 means

P0124 is the standardized powertrain DTC for “Throttle/Pedal Position Sensor/Switch A Circuit Intermittent.” The code identifies the monitored condition; it does not by itself prove which part failed.

How to interpret the code wording

“Intermittent” means the signal fault is not continuously present. Preserve freeze-frame data, inspect harness movement/heat/vibration points, check terminal tension, and monitor the circuit while gently manipulating the harness when the service procedure permits.

Possible symptoms

• Check Engine Light or reduced-power warning
• Limited throttle response
• Unstable idle or hesitation
• Possible limp-home mode

Causes to test

These are diagnostic possibilities, not a statistical parts-replacement ranking. Vehicle-specific service information takes priority.

• Throttle/pedal sensor circuit, connector, or reference-voltage fault
• Sensor tracks that disagree or have dead spots
• Throttle body contamination or mechanical binding where applicable
• Actuator motor/control-circuit fault on electronic throttle systems
• Power/ground or control-module issue after external checks

Step-by-step diagnostic workflow

1. Record all throttle/pedal companion codes before clearing.
2. Compare redundant pedal/throttle position PIDs through a slow, smooth sweep; look for dropouts or disagreement.
3. Inspect connectors, reference voltage, grounds, and harness routing.
4. Check throttle plate movement/contamination only as allowed by the vehicle procedure; some systems require relearn after cleaning or replacement.
5. For actuator codes, compare commanded and actual throttle position and follow the OEM motor/circuit test.
6. Clear codes only after repair, then complete an appropriate drive cycle and verify the code and symptoms do not return.

Scan data worth checking

• APP sensor tracks
• Throttle position sensor tracks
• Commanded vs actual throttle angle
• Reference voltage
• Engine RPM and load

Severity and drivability

Moderate to high. Electronic throttle faults can trigger reduced-power mode and should be diagnosed before continued high-load driving.

Stop driving and investigate immediately if there is a flashing MIL, oil-pressure warning, overheating, fuel leakage, severe misfire, major loss of power, abnormal mechanical noise, or a transmission that is slipping badly.

Common diagnostic mistakes

• Forcing an electronic throttle plate against service instructions
• Replacing the throttle body when a pedal/reference-voltage fault is primary
• Skipping required throttle/idle relearn procedures

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