AutoCodes – Toyota – P2128 2003 Toyota Highlander

P2128 2003 Toyota Highlander Code - Throttle Pedal Position Sensor/Switch 'E' Circuit Input High

Quick Answer

The Accelerator Pedal Position (APP) sensor is mounted on the accelerator pedal to detect the angle of the accelerator pedal. Common causes include Faulty Accelerator Pedal Position (APP) Sensor, Accelerator Pedal Position (APP) Sensor harness is open or shorted, Accelerator Pedal Position (APP) 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: P2128 2003 Toyota Highlander indicates Throttle Pedal Position Sensor/Switch 'E' Circuit Input High.
Common causes: Common causes include Faulty Accelerator Pedal Position (APP) Sensor, Accelerator Pedal Position (APP) Sensor harness is open or shorted, Accelerator Pedal Position (APP) 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 1,971

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 Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2128 2003 Toyota Highlander Description

The Accelerator Pedal Position (APP) sensor is mounted on the accelerator pedal to detect the angle of the accelerator pedal. This sensor is electronically controlled and uses Hall-effect elements.
In the accelerator pedal position sensor, the voltage applied to terminals VPA and VPA2 of the Engine Control Module (ECM) changes between 0 V and 5 V in proportion to the angle of the accelerator pedal. The VPA is a signal to indicate the actual accelerator pedal angle and is used for the engine control. VPA2 is used to detect malfunctions of the sensor itself.
The ECM monitors the accelerator pedal angle from VPA and VPA2 signal outputs, and controls the throttle motor based on these signals.

OBDII Code P2128 2003 Toyota Highlander - Throttle Pedal Position Sensor/Switch 'E' Circuit Input High - AutoCodes.com — P2128 2003 Toyota Highlander Code - Throttle Pedal Position Sensor/Switch 'E' Circuit Input High

What does this mean?

What are the Possible Causes of the DTC P2128 2003 Toyota Highlander?

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

How to Fix the DTC P2128 2003 Toyota Highlander?

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 P2128 2003 Toyota Highlander 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 P2128 2003 Toyota Highlander code?

Need more information on how to fix the P2128 2003 Toyota Highlander code? Get Access to Factory Service Manuals

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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 P2128 2003 Toyota Highlander Code

1. What are the common symptoms of OBDII code P2128 in a 2003 Toyota Highlander?

The common symptoms of OBDII code P2128 in a 2003 Toyota Highlander include reduced engine power, acceleration hesitation, and the vehicle going into "limp mode."

2. What can cause the Throttle Pedal Position Sensor/Switch 'E' Circuit Input High code (P2128) in a 2003 Toyota Highlander?

The P2128 code in a 2003 Toyota Highlander is usually triggered by a faulty throttle pedal position sensor/switch, damaged wiring or connectors, or a problem with the engine control module (ECM).

3. How can I diagnose the cause of OBDII code P2128 in my 2003 Toyota Highlander?

To diagnose the cause of code P2128, you can start by checking the throttle pedal position sensor/switch for proper operation, inspecting the wiring and connectors for any damage, and using a scan tool to read live data from the ECM.

4. Can I drive my 2003 Toyota Highlander with the Throttle Pedal Position Sensor/Switch 'E' Circuit Input High code (P2128)?

It is not recommended to drive your 2003 Toyota Highlander with code P2128, as it can lead to reduced engine power and potential safety hazards. It's best to have the issue diagnosed and repaired before driving the vehicle.

5. How do I repair OBDII code P2128 in my 2003 Toyota Highlander?

To repair code P2128 in a 2003 Toyota Highlander, you may need to replace the throttle pedal position sensor/switch, repair any damaged wiring or connectors, or reprogram the ECM. It's advisable to consult a professional mechanic for a proper diagnosis and repair.

6. Will resetting the OBDII code P2128 in my 2003 Toyota Highlander make it go away permanently?

Simply resetting the code may temporarily clear the check engine light, but if the underlying issue causing code P2128 is not addressed, the code is likely to return. It's important to diagnose and fix the root cause of the problem.

7. How much does it typically cost to repair OBDII code P2128 in a 2003 Toyota Highlander?

The cost of repairing OBDII code P2128 in a 2003 Toyota Highlander can vary depending on the exact cause of the issue, labor rates in your area, and whether you choose to go to a dealership or an independent mechanic. It's best to get estimates from different sources.

8. Can a DIY enthusiast fix OBDII code P2128 in a 2003 Toyota Highlander?

Depending on your skill level and access to tools, a DIY enthusiast may be able to fix code P2128 by replacing the throttle pedal position sensor/switch or repairing damaged wiring. However, for more complex issues or if you're unsure, it's recommended to seek professional help.

9. Is OBDII code P2128 a common issue in 2003 Toyota Highlanders?

While OBDII code P2128 related to the throttle pedal position sensor/switch 'E' circuit input high is not one of the most common issues in 2003 Toyota Highlanders, it can still occur due to sensor failures or wiring problems.

10. How long does it typically take to repair OBDII code P2128 in a 2003 Toyota Highlander?

The repair time for OBDII code P2128 in a 2003 Toyota Highlander can vary depending on the exact cause of the issue and the availability of parts. In general, it may take a few hours to a full day for a mechanic to diagnose and fix the problem.