What does the P0122 error code mean?
The P0122 diagnostic trouble code stands for "Throttle Position Sensor (TPS) Circuit Low Input." This code is triggered when the engine control module detects a voltage signal from the throttle position sensor that is lower than the expected range. The throttle position sensor monitors the position of the throttle plate and sends this information to the engine control module to regulate fuel delivery, ignition timing and engine performance.
Why is the P0122 issue important?
The throttle position sensor plays a critical role in ensuring optimal engine performance by communicating throttle position to the engine control module. A low-voltage input can lead to incorrect air-fuel mixture calculations, causing poor engine performance, reduced fuel efficiency, and potential safety concerns such as stalling or hesitation during acceleration.
Can I safely drive my car with this error code?
Driving with the P0122 error code is not advisable. A malfunctioning throttle position sensor can result in unpredictable throttle response, leading to sudden acceleration or deceleration. This issue can compromise safety and cause further damage to engine components if left unresolved.
Common symptoms of the P0122 error ode
- Illuminated check engine light
- Hesitation or lag during acceleration
- Reduced engine power (limp mode)
- Engine stalling or rough idling
- Poor fuel efficiency
- Unresponsive or erratic throttle behavior
Diagnosing the P0122 error code
Diagnosing the P0122 code involves the following steps:
- Scan for codes: Use an OBD-II scanner to confirm the P0122 code and identify any related codes.
- Inspect the throttle position sensor: Check for physical damage, loose connections, or corrosion on the throttle position sensor and its wiring.
- Test voltage and ground signals: Use a multimeter to verify that the throttle position sensor receives proper voltage and ground signals.
- Check output signal: Measure the throttle position sensor output signal voltage while gradually opening and closing the throttle to ensure a smooth and continuous response.
- Examine related components: Inspect the throttle body and engine control module for potential issues affecting performance of the throttle position sensor.
Repairing the P0122 error code
Repairing the P0122 code typically includes:
- Replacing a faulty throttle position sensor.
- Repairing or replacing damaged or corroded wiring and connectors in the throttle position sensor circuit.
- Cleaning the throttle body to ensure proper operation of the throttle plate.
- Testing and, if necessary, replacing the engine control module.
- Clearing the code and conducting a test drive to confirm the issue is resolved.
Related reading
Follow the link below to reach our diagnostic check engine trouble codes catalog:
On-board diagnostics (OBD-II) trouble code directory