DTC P0124 Throttle/Pedal Position Sensor ‘A’ Intermittent

In the intricate world of automotive diagnostics, diagnostic trouble codes (DTCs) serve as guiding lights, leading mechanics towards potential issues within a vehicle’s systems. Among these, DTC P0124 takes center stage as a significant indicator of problems related to the intermittent behavior of the Throttle/Pedal Position Sensor ‘A’. This comprehensive article delves into the causes, symptoms, inspection procedures, and effective solutions for addressing and resolving DTC P0124.

1. Causes of DTC P0124:

DTC P0124 surfaces when the Engine Control Module (ECM) detects intermittent fluctuations within the Throttle/Pedal Position Sensor ‘A’ circuit. The underlying causes can encompass:

– Faulty Throttle/Pedal Position Sensor: A sensor with sporadic malfunctions or intermittent connections can lead to erratic data transmission.

– Wiring and connector issues: Damaged, corroded, or loose wiring and connectors within the sensor circuit can cause intermittent signal disruptions.

– Accelerator pedal linkage problems: Mechanical issues with the accelerator pedal’s linkage can affect sensor readings.

– ECM communication problems: Intermittent ECM malfunctions or communication breakdowns can result in inconsistent sensor data.

2. Symptoms of DTC P0124:

Recognizing the symptoms associated with DTC P0124 aids mechanics in accurately diagnosing the issue:

– Reduced engine power: The ECM may activate a “limp mode” to restrict engine performance and prevent potential damage.

– Unresponsive throttle: The accelerator pedal may have delayed or no response due to erratic sensor readings.

– Poor fuel efficiency: Inconsistent throttle position readings can result in varying fuel consumption patterns.

– Illuminated Check Engine Light (CEL): DTC P0124 triggers the CEL to alert the driver of a potential intermittent problem.

3. Inspection of DTC P0124:

Thorough inspection techniques are crucial for accurate diagnosis:

– OBD-II scan: Utilize an OBD-II scanner to retrieve the DTC and accompanying freeze frame data, providing insight into the conditions that activated the code.

– Visual examination: Inspect the Throttle/Pedal Position Sensor, wiring, and connectors for visible signs of damage, contamination, or corrosion.

– Sensor testing: Verify the sensor’s output using a multimeter or scan tool during both normal and intermittent conditions.

4. Resolving Causes of DTC P0124:

Addressing DTC P0124 involves specific steps tailored to the underlying issue:

– Throttle/Pedal Position Sensor replacement: Replace a malfunctioning sensor with a new, high-quality unit that meets manufacturer specifications.

– Wiring and connector repair: Repair or replace damaged wiring and connectors to ensure consistent signal transmission.

– Accelerator pedal linkage inspection: Ensure the accelerator pedal linkage is functioning smoothly and without obstructions.

– ECM diagnosis: If an ECM malfunction is suspected, diagnose and rectify the issue through reprogramming or replacement.

5. Clearing DTC P0124:

After successfully addressing the root cause, clear the DTC from the ECM’s memory using an OBD-II scanner. This step confirms the issue’s resolution and prevents the recurrence of the CEL.


DTC P0124, indicative of an intermittent Throttle/Pedal Position Sensor ‘A’ circuit, requires meticulous attention. Through a comprehensive understanding of its causes, recognition of its symptoms, thorough inspection techniques, and effective solutions, mechanics can accurately diagnose and rectify this issue. Maintaining consistent and reliable throttle position readings remains pivotal for ensuring optimal engine operation, smooth acceleration, and overall vehicle functionality.