P0122 Scion Code - Throttle / Pedal Position Sensor / Switch 'A' Circuit Low Input
Quick Answer
The throttle position sensor is mounted on the throttle with motor body assembly and detects the opening angle of the throttle valve. Common causes include Faulty Throttle Position Sensor (built into Throttle Body Assembly), Throttle Position Sensor circuit is open or shorted, Throttle Position Sensor poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0122 Scion indicates Throttle / Pedal Position Sensor / Switch 'A' Circuit Low Input.
- Common causes
- Common causes include Faulty Throttle Position Sensor (built into Throttle Body Assembly), Throttle Position Sensor circuit is open or shorted, Throttle Position Sensor poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P0122 Scion Description
As the valve closes, the sensor output voltage decreases and as the valve opens, the sensor output voltage increases. The Engine Control Module (ECM) calculates the throttle valve opening angle according to these signals and controls the throttle actuator in response to driver inputs. These signals are also used in calculations such as air-fuel ratio correction, power increase correction, and fuel-cut control.
The ECM uses the throttle position sensor to monitor the throttle valve opening angle. There are several checks that the ECM performs to confirm the proper operation of the throttle position sensor.
This sensor transmits two signals, if the output voltage difference between the two signals deviates from the normal operating range, the ECM interprets this as a malfunction in the throttle position sensor. The ECM illuminates the MIL and stores the Diagnostic Trouble Code (DTC).
What are the Possible Causes of the DTC P0122 Scion?
- Faulty Throttle Position Sensor (built into Throttle Body Assembly)
- Throttle Position Sensor circuit is open or shorted
- Throttle Position Sensor poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P0122 Scion?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0122 Scion code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Information for Specific Scion Models
- P0122 2005 Scion xB — Throttle Position Sensor/Switch 'A' Circuit Low Input
- P0122 2006 Scion xB — Throttle Position Sensor/Switch 'A' Circuit Low Input
- P0122 2007 Scion xB — Throttle Position Sensor/Switch 'A' Circuit Low Input
Frequently Asked Questions about P0122 Scion Code
What does the OBDII code P0122 mean for a Scion?
P0122 indicates that the throttle or pedal position sensor/switch 'A' circuit is reporting a voltage input lower than expected by the engine control module (ECM).
What are the symptoms of code P0122 in a Scion?
Symptoms may include poor acceleration, engine hesitation, stalling, reduced fuel efficiency, and the illumination of the check engine light.
What causes the P0122 code in a Scion?
Common causes include a faulty throttle position sensor (TPS), damaged or corroded wiring, a bad electrical connection, or a malfunctioning ECM.
Can you drive a Scion with the P0122 code active?
It is not recommended to drive with this code active, as it may cause drivability issues like stalling or hesitation, which can be unsafe.
How do you diagnose the P0122 code on a Scion?
Diagnosis typically involves using an OBDII scanner to confirm the code, inspecting the throttle position sensor and related wiring, and testing the voltage output of the TPS.
How do you fix the P0122 code on a Scion?
Repairs may include replacing the throttle position sensor, repairing or replacing damaged wiring, cleaning corroded connections, or updating/reprogramming the ECM if needed.
Can a dirty throttle body cause the P0122 code?
Yes, a dirty throttle body can sometimes cause incorrect readings from the throttle position sensor, which may trigger the P0122 code.
How much does it cost to repair the P0122 code in a Scion?
Repair costs vary but typically range from $100 to $300, depending on whether the issue is with the TPS, wiring, or other components.
Can a failing pedal position sensor trigger the P0122 code?
Yes, if the pedal position sensor shares the same circuit or functionality, a failure in this component can also cause the code.
Will clearing the P0122 code fix the problem in a Scion?
Clearing the code may temporarily turn off the check engine light, but the underlying issue must be resolved to prevent the code from returning.
Discuss the causes and fixes for P0122 Scion OBDII Code
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