AutoCodes – Generic – P0123

P0123 Code - Throttle Position Sensor/Switch 'A' Circuit High Input

Quick Answer

The Throttle Position Sensor (TPS) responds to the accelerator pedal movement. Common causes include Faulty throttle position sensor, Throttle position sensor harness is open or shorted, Throttle position sensor circuit 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: P0123 indicates Throttle Position Sensor/Switch 'A' Circuit High Input.
Common causes: Common causes include Faulty throttle position sensor, Throttle position sensor harness is open or shorted, Throttle position sensor circuit 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.

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Code Popularity 66,997

How popular is this code, among other codes? Medium

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P0123 Description

The Throttle Position Sensor (TPS) responds to the accelerator pedal movement. This sensor is a kind of potentiometer which transforms the throttle position into output voltage, and emits the voltage signal to the Engine Control Module (ECM). In addition, the sensor detects the opening and closing speed of the throttle valve and feeds the voltage signal to the ECM.
Idle position of the throttle valve is determined by the ECM receiving the signal from the throttle position sensor. This sensor controls engine operation such as fuel cut. On the other hand, the Wide open and closed throttle position switch, which is built into the throttle position sensor unit, is not used for engine control.

OBDII Code P0123 - Throttle Position Sensor/Switch 'A' Circuit High Input - AutoCodes.com — P0123 Code - Throttle Position Sensor/Switch 'A' Circuit High Input

What does this mean?

What are the Possible Causes of the DTC P0123?

Faulty throttle position sensor
Throttle position sensor harness is open or shorted
Throttle position sensor circuit poor electrical connection

How to Fix the DTC P0123?

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 P0123 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 Makes

P0123 Acura — Throttle Position Sensor 'A' Circuit High Voltage
P0123 Audi — Throttle Pedal Position Sensor/Switch 'A' Circuit High
P0123 BMW — Throttle/Pedal Position Sensor/Switch 'A' Circuit High
P0123 Buick — Throttle Position Sensor Circuit High Voltage
P0123 Cadillac — Throttle Position Sensor Circuit High Voltage
P0123 Chevrolet — Throttle Position Sensor Circuit High Voltage
P0123 Chrysler — Throttle Position Sensor/Accelerator Position Pedal Circuit High Input
P0123 Dodge — Throttle Position Sensor/Accelerator Position Pedal Circuit High Input
P0123 Ford — Throttle/Pedal Position Sensor 'A' Circuit High
P0123 GMC — Throttle Position Sensor Circuit High Voltage
P0123 Honda — Throttle Position Sensor 'A' Circuit High Voltage
P0123 Hyundai — Throttle/Pedal Position Sensor 'A' Circuit High Input
P0123 Infiniti — Throttle Position Sensor/Switch '1' Circuit High Input
P0123 Isuzu — Throttle Position Sensor 1 High Voltage
P0123 Jeep — Throttle Position Sensor/Accelerator Position Pedal Circuit High Input
P0123 KIA — Throttle/Pedal Position Sensor 'A' Circuit High Input
P0123 Lexus — Throttle / Pedal Position Sensor / Switch 'A' Circuit High Input
P0123 Mazda — Throttle Position Sensor 1 Circuit High Input
P0123 Mercedes-Benz — Throttle/Pedal Position Sensor/Switch 'A' Circuit High Input
P0123 MINI — Throttle/Pedal Position Sensor/Switch 'A' Circuit High
P0123 Mitsubishi — Throttle Position Sensor Circuit High Input
P0123 Nissan — Throttle Position Sensor/Switch '1' Circuit High Input
P0123 Pontiac — Throttle Position Sensor Circuit High Voltage
P0123 Saturn — Throttle Position Sensor Circuit High Voltage
P0123 Scion — Throttle / Pedal Position Sensor / Switch 'A' Circuit High Input
P0123 Subaru — Throttle Position Sensor/Switch 'A' Circuit High Input
P0123 Toyota — Throttle / Pedal Position Sensor / Switch 'A' Circuit High Input
P0123 Volkswagen — Throttle Pedal Position Sensor/Switch 'A' Circuit High

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.