AutoCodes – Toyota – P2123 Toyota

P2123 Toyota Code - Throttle Pedal Position Sensor/Switch 'D' Circuit Input High

Quick Answer

The Accelerator Pedal Position (APP) sensor is built into the accelerator pedal sensor assembly and has 2 sensor circuits: VPA (main) and VPA2 (sub). Common causes include Faulty Accelerator Pedal Position (APP) Sensor, Accelerator Pedal Position Sensor harness is open or shorted, Accelerator Pedal 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: P2123 Toyota indicates Throttle Pedal Position Sensor/Switch 'D' Circuit Input High.
Common causes: Common causes include Faulty Accelerator Pedal Position (APP) Sensor, Accelerator Pedal Position Sensor harness is open or shorted, Accelerator Pedal 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 14,161

How popular is this code, among other codes? Low

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 Sep 17, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P2123 Toyota Description

The Accelerator Pedal Position (APP) sensor is built into the accelerator pedal sensor assembly and has 2 sensor circuits: VPA (main) and VPA2 (sub). This sensor is a non-contact type sensor and uses Hall-effect elements in order to yield accurate signals even in extreme driving conditions, such as at high speeds as well as very low speeds. The voltage, which is applied to terminals VPA and VPA2 of the Engine Control Module (ECM), varies between 0.5 V and 4.75 V in proportion to the operating angle of the accelerator pedal (throttle valve). A signal from VPA indicates the actual accelerator pedal opening angle (throttle valve opening angle) and is used for engine control. A signal from VPA2 conveys the status of the VPA circuit and is used to check the accelerator pedal position sensor itself.
The ECM monitors the actual accelerator pedal opening angle (throttle valve opening angle) through the signals from VPA and VPA2 and controls the throttle actuator according to these signals.
When either the output voltage of VPA or VPA2 deviates from the standard range, or the difference between the output voltages of the 2 sensor circuits is more than the threshold, the ECM determines that there is a malfunction in the accelerator pedal position sensor. The ECM then illuminates the MIL and stores a Diagnostic Trouble Code (DTC).

OBDII Code P2123 Toyota - Throttle Pedal Position Sensor/Switch 'D' Circuit Input High - AutoCodes.com — P2123 Toyota Code - Throttle Pedal Position Sensor/Switch 'D' Circuit Input High

What does this mean?

What are the Possible Causes of the DTC P2123 Toyota?

Faulty Accelerator Pedal Position (APP) Sensor
Accelerator Pedal Position Sensor harness is open or shorted
Accelerator Pedal Position Sensor circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P2123 Toyota?

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 P2123 Toyota 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.

Need more information about the P2123 Toyota code?

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Information for Specific Toyota Models

P2123 2006 Toyota Camry — Throttle Pedal Position Sensor/Switch 'D' Circuit Input High
P2123 2007 Toyota Camry — Throttle Pedal Position Sensor/Switch 'D' Circuit Input High
P2123 2008 Toyota Camry — Throttle Pedal Position Sensor/Switch 'D' Circuit Input High
P2123 2009 Toyota Camry — Throttle Pedal Position Sensor/Switch 'D' Circuit Input High
P2123 2010 Toyota Camry — Throttle Pedal Position Sensor/Switch 'D' Circuit Input High
P2123 2011 Toyota Camry — Throttle Pedal Position Sensor/Switch 'D' Circuit Input High
P2123 2001 Toyota Highlander — Throttle Pedal Position Sensor/Switch 'D' Circuit Input High
P2123 2002 Toyota Highlander — Throttle Pedal Position Sensor/Switch 'D' Circuit Input High
P2123 2003 Toyota Highlander — Throttle Pedal Position Sensor/Switch 'D' Circuit Input High
P2123 2004 Toyota Highlander — Throttle Pedal Position Sensor/Switch 'D' Circuit Input High
P2123 2005 Toyota Highlander — Throttle Pedal Position Sensor/Switch 'D' Circuit Input High
P2123 2006 Toyota Highlander — Throttle Pedal Position Sensor/Switch 'D' Circuit Input High
P2123 2007 Toyota Highlander — Throttle Pedal Position Sensor/Switch 'D' Circuit Input High
P2123 2013 Toyota RAV4 — Throttle Pedal Position Sensor/Switch 'D' Circuit Input High
P2123 2014 Toyota RAV4 — Throttle Pedal Position Sensor/Switch 'D' Circuit Input High
P2123 2015 Toyota RAV4 — Throttle Pedal Position Sensor/Switch 'D' Circuit Input High
P2123 2016 Toyota RAV4 — Throttle Pedal Position Sensor/Switch 'D' Circuit Input High
P2123 2017 Toyota RAV4 — Throttle Pedal Position Sensor/Switch 'D' Circuit Input High
P2123 2018 Toyota RAV4 — Throttle Pedal Position Sensor/Switch 'D' Circuit Input 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.