AutoCodes – Lexus – P2122 Lexus

P2122 Lexus Code - Throttle Pedal Position Sensor/Switch 'D' Circuit Input Low

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: P2122 Lexus indicates Throttle Pedal Position Sensor/Switch 'D' Circuit Input Low.
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 7,454

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
FAQs
Comments
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Code P2122 Lexus 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 P2122 Lexus - Throttle Pedal Position Sensor/Switch 'D' Circuit Input Low - AutoCodes.com — P2122 Lexus Code - Throttle Pedal Position Sensor/Switch 'D' Circuit Input Low

What does this mean?

What are the Possible Causes of the DTC P2122 Lexus?

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 P2122 Lexus?

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 P2122 Lexus 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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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.

Frequently Asked Questions about P2122 Lexus Code

What does the OBDII code P2122 mean on a Lexus?

1. P2122 indicates that the Throttle Pedal Position Sensor/Switch 'D' circuit has a low input signal, often caused by a fault in the sensor, wiring, or related components. 2.

What are the common symptoms of a P2122 code in a Lexus?

Symptoms may include reduced engine performance, limited throttle response, the vehicle entering limp mode, and the Check Engine Light illuminating. 3.

What causes the P2122 code in a Lexus?

Common causes include a faulty throttle pedal position sensor, damaged or corroded wiring, poor electrical connections, or a malfunctioning engine control module (ECM). 4.

Can I drive my Lexus with a P2122 code?

While the vehicle may still be drivable, reduced performance and throttle response can make it unsafe. Itâ€™s best to address the issue promptly to avoid further damage. 5.

How do I diagnose a P2122 code in a Lexus?

Start by inspecting the throttle pedal position sensor and its wiring for damage or corrosion. Use a scan tool to monitor sensor readings and check for continuity with a multimeter. 6.

How do I fix the P2122 code in a Lexus?

Repairs may include replacing the throttle pedal position sensor, repairing or replacing damaged wiring, cleaning corroded connectors, or updating/replacing the ECM if necessary. 7.

How much does it cost to fix a P2122 code on a Lexus?

Costs vary depending on the issue, but throttle pedal position sensor replacement typically ranges from $150 to $400, including parts and labor. 8.

Can a dirty throttle body cause the P2122 code on a Lexus?

While a dirty throttle body is not a direct cause, it can contribute to performance issues that might trigger related codes. Ensure the throttle body is clean during diagnostics. 9.

Will clearing the P2122 code with a scan tool fix the issue?

Clearing the code will reset the Check Engine Light temporarily, but the underlying issue must be resolved to prevent the code from returning. 10.

Is the P2122 code specific to Lexus vehicles?

No, the P2122 code is a generic OBDII code that can appear on many vehicles, but the diagnostic and repair process may vary depending on the make and model.