P0122 Fault Code

Throttle/Pedal Position Sensor/Switch A Circuit Low Input

• What does that mean?
• Symptoms
• Causes
• Solutions

The P0122 code indicates a low input signal from the throttle or pedal position sensor switch A. This sensor plays a crucial role in relaying the position of the throttle to the engine control unit (ECU), affecting engine performance and response. A low input signal means the ECU isn't receiving the correct voltage, which may lead to various engine performance issues.

What are the symptoms of the P0122 code?

Common symptoms associated with the P0122 code might include:

• Reduced engine performance or power
• Poor acceleration response
• Rough idling or stalling
• Check Engine Light illuminating on the dashboard
• Difficulty in starting the vehicle

What causes the P0122 code?

Several factors can trigger the P0122 fault code, such as:

• A faulty throttle position sensor (TPS)
• Corroded or damaged wiring or connectors in the throttle position sensor circuit
• A poor electrical connection or insufficient ground
• Problems in the engine control module (ECM)
• Mechanical issues in the throttle body that may restrict movement

How to fix P0122?

To resolve the P0122 fault code, the following steps can be taken:

• Inspect and, if necessary, replace the throttle position sensor (TPS)
• Check for damaged wiring or connectors in the TPS circuit and replace or repair as needed
• Ensure proper ground connections and voltage supply to the TPS
• Clean or replace components of the throttle body if mechanical issues are identified
• Clear the fault code and test drive the vehicle to ensure the problem does not return