P2128 Lexus Code - Throttle Pedal Position Sensor/Switch 'E' 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
- P2128 Lexus indicates Throttle Pedal Position Sensor/Switch 'E' 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.
Code P2128 Lexus Description
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).
What are the Possible Causes of the DTC P2128 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 P2128 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 P2128 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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Frequently Asked Questions about P2128 Lexus Code
1. What are common symptoms of OBDII code P2128 in a Lexus related to the Throttle Pedal Position Sensor/Switch 'E' Circuit Input High?
- Common symptoms include reduced engine power, acceleration issues, and the vehicle going into limp mode.
2. What are possible causes of OBDII code P2128 in a Lexus?
- Possible causes include a faulty throttle pedal position sensor, damaged wiring or connectors, or issues with the engine control module.
3. How can I diagnose the Throttle Pedal Position Sensor/Switch 'E' Circuit Input High issue in my Lexus?
- Use a diagnostic scanner to read the OBDII trouble code, visually inspect the throttle pedal sensor and related wiring, and perform testing according to the manufacturer's service manual.
4. Can I continue driving my Lexus with OBDII code P2128 present?
- It is not recommended to continue driving with this code as it can lead to unsafe driving conditions and potential further damage to the vehicle.
5. How can I repair OBDII code P2128 related to the Throttle Pedal Position Sensor/Switch 'E' Circuit Input High in my Lexus?
- Repair options may include replacing the throttle pedal position sensor, repairing damaged wiring or connectors, or reprogramming the engine control module.
6. Are there any DIY tips for fixing OBDII code P2128 in a Lexus?
- DIY tips include checking for loose connections, ensuring proper sensor installation, and following the manufacturer's repair guidelines.
7. Will resetting the OBDII code P2128 in my Lexus make the issue go away?
- Resetting the code may temporarily clear the warning light, but it will not fix the underlying issue causing the Throttle Pedal Position Sensor/Switch 'E' Circuit Input High problem.
8. How much does it typically cost to repair OBDII code P2128 in a Lexus at a professional mechanic?
- Repair costs can vary depending on the specific issue, but expect to pay for parts and labor, with the total cost ranging from $100 to $500 or more.
9. Can a faulty Throttle Pedal Position Sensor cause other OBDII codes to appear in a Lexus?
- Yes, a faulty sensor can trigger other related OBDII codes such as P2127, P2129, or P2138 in addition to code P2128.
10. Is it possible to prevent OBDII code P2128 from occurring in my Lexus?
- Regular maintenance, including checking and replacing worn sensors or components, can help prevent the occurrence of code P2128 related to the Throttle Pedal Position Sensor/Switch 'E' Circuit Input High.
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