P0122 Throttle Pedal Position Sensor Switch A Circuit Low Input

OBD-II Code: P0122

Description: Throttle Pedal Position Sensor/Switch A Circuit Low Input

Definition: This code indicates that the Engine Control Module (ECM) has detected a low voltage input from the throttle position sensor/switch A circuit, which is below the expected range.

p0122 – Throttle/Pedal Position Sensor/Switch A Circuit Low Input

Severity: Moderate

Common Causes

P0122 – Throttle/Pedal Position Sensor/Switch A Circuit Low Input

Common causes:

• Faulty throttle position sensor
• Short circuit in the wiring of the throttle position sensor
• Corrosion or poor connection at the throttle position sensor connector
• Issues with the powertrain control module (PCM)

 

Common Misdiagnosis

OBD2 Code: P0122

Description: Throttle Pedal Position Sensor/Switch A Circuit Low Input

Common Misdiagnosis: Replacing the throttle pedal position sensor without checking for wiring issues or connector problems.

 

Common Diagnostic Steps

OBD2 Code: P0122

Description: Throttle Pedal Position Sensor/Switch A Circuit Low Input

Common Diagnostic Steps:

• Check for any additional trouble codes that may be present and address them first.
• Inspect the throttle pedal position sensor and its wiring for damage or disconnection.
• Test the voltage at the throttle pedal position sensor using a multimeter to ensure it is within specifications.
• Examine the connector pins for corrosion, bent pins, or poor connections.
• Verify that the ground connection is secure and free of rust or paint interference.
• If equipped, check the operation of the throttle body and related components for proper function.
• Replace the throttle pedal position sensor if it fails testing or shows signs of physical damage.
• Clear all codes after repairs are made and perform a road test to confirm resolution of the issue.