P0123 – Throttle Position Sensor (TPS) "A" Circuit High Input

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P0123 Code – Throttle Position Sensor (TPS) Circuit High Input | Complete OBD-II Diagnostic Guide

Introduction

P0123 is a generic OBD-II Diagnostic Trouble Code (DTC) that stands for:

P0123 – Throttle Position Sensor (TPS) "A" Circuit High Input

This code indicates that the Engine Control Unit (ECU) has detected a voltage signal from the Throttle Position Sensor (TPS) that is higher than the manufacturer's specified range.

The TPS is a critical sensor that tells the ECU how far the throttle plate is open. The ECU uses this information to control fuel injection, ignition timing, transmission shifting, and engine performance.

When the P0123 code appears, the Check Engine Light will usually illuminate and the vehicle may enter limp mode.

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What is a Throttle Position Sensor (TPS)?

The Throttle Position Sensor is mounted on:

• Throttle Body

• Electronic Throttle Assembly

Its job is to measure:

• Throttle plate angle

• Accelerator demand

• Engine load

The TPS sends a voltage signal to the ECU.

Typical voltage:

Closed Throttle

0.4V – 0.9V

Wide Open Throttle

4.0V – 4.8V

When voltage exceeds the expected range, the ECU stores code P0123.

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P0123 Meaning in English

The ECU detects a higher-than-normal voltage signal from the TPS circuit.

This may indicate:

• Faulty TPS

• Short circuit to power

• Wiring damage

• Throttle body problems

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P0123 Meaning in Hindi

P0123 ka matlab hai ki Throttle Position Sensor ECU ko normal se zyada voltage signal bhej raha hai.

Is wajah se ECU throttle position ko galat read karta hai aur Check Engine Light ON ho sakti hai.

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P0123 Meaning in Urdu

P0123 ka matlab hai ke Throttle Position Sensor ECU ko had se zyada voltage signal bhej raha hai.

ECU throttle ki position ko sahi tarah samajh nahi pata aur engine performance mutasir ho sakti hai.

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Common Symptoms of P0123

Check Engine Light ON

Sabse common symptom.

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Poor Acceleration

Vehicle sluggish ho sakti hai.

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Engine Hesitation

Accelerator dabane par delay mehsoos hota hai.

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High Idle Speed

Engine RPM normal se zyada ho sakta hai.

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Rough Running

Engine smoothly operate nahi karta.

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Limp Mode Activated

Kai modern vehicles safety mode mein chale jate hain.

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Transmission Shifting Problems

Automatic transmission gear changes affect ho sakte hain.

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Reduced Fuel Economy

Fuel consumption barh sakti hai.

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Common Causes of P0123

Faulty Throttle Position Sensor

Sabse common cause.

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Short Circuit to Battery Voltage

TPS signal wire power se short ho sakti hai.

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Damaged Wiring Harness

Broken ya melted wires.

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Corroded Connector

Poor electrical connection.

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Faulty Electronic Throttle Body

Internal sensor failure.

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ECU Problems

Rare but possible.

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Vehicles Commonly Affected

Toyota

• Corolla

• Innova

• Fortuner

• Camry

Honda

• City

• Civic

• Amaze

Hyundai

• i20

• Creta

• Verna

Kia

• Sonet

• Seltos

Nissan

• Sunny

• Micra

• Magnite

Maruti Suzuki

• Swift

• WagonR

• Baleno

Volkswagen

• Polo

• Vento

• Ameo

• Virtus

Ford

• EcoSport

• Figo

BMW

• 3 Series

• X1

Mercedes-Benz

• C-Class

• E-Class

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How to Diagnose P0123

Step 1

Connect an OBD-II Scanner.

Read stored codes.

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Step 2

Inspect TPS Connector.

Check for:

• Loose terminals

• Corrosion

• Water ingress

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Step 3

Check Live Data.

Monitor TPS percentage.

Normal:

• Idle: 0–10%

• Wide Open Throttle: 90–100%

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Step 4

Measure TPS Voltage.

Closed throttle:

0.4V–0.9V

Open throttle:

4.0V–4.8V

If voltage remains excessively high:

TPS or wiring is faulty.

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Step 5

Inspect Wiring Harness.

Check for:

• Short circuits

• Open circuits

• Damaged insulation

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How to Fix P0123

Clean TPS Connector

Remove corrosion.

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Repair Wiring

Fix damaged wires.

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Replace TPS Sensor

If testing confirms failure.

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Replace Throttle Body

If TPS is integrated into throttle body.

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Clear DTC Codes

After repair:

• Clear codes

• Perform road test

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Related Trouble Codes

Code	Description
P0120	TPS Circuit Malfunction
P0121	TPS Range/Performance
P0122	TPS Circuit Low Input
P0123	TPS Circuit High Input
P0124	TPS Intermittent Signal

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Can You Drive with P0123?

Possible for short distances.

However:

⚠ Reduced engine performance

⚠ Poor fuel economy

⚠ Limp mode activation

⚠ Unstable acceleration

Vehicle should be repaired as soon as possible.

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Prevention Tips

• Inspect throttle body regularly.

• Keep connectors clean.

• Avoid water intrusion.

• Repair damaged wiring immediately.

• Use OEM-quality sensors.

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Conclusion

P0123 – Throttle Position Sensor (TPS) Circuit High Input indicates that the ECU is receiving an excessively high voltage signal from the throttle position sensor circuit. Common causes include a faulty TPS, damaged wiring, corroded connectors, short circuits, or throttle body issues. Proper diagnosis using a scan tool and multimeter can accurately identify the fault and restore normal engine performance.

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