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P1223 Infiniti Code - Throttle Position Sensor 2 Circuit Low Input

Quick Answer

The P1223 code for Infiniti vehicles indicates a problem with the Throttle Position Sensor 2 Circuit, specifically a low input signal. Common causes include Faulty Throttle Position Sensor 2, Wiring issues or shorts in the TPS 2 circuit, Corrosion or poor connections in the sensor wiring. 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
P1223 Infiniti indicates Throttle Position Sensor 2 Circuit Low Input.
Common causes
Common causes include Faulty Throttle Position Sensor 2, Wiring issues or shorts in the TPS 2 circuit, Corrosion or poor connections in the sensor wiring.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 08, 2024
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Code P1223 Infiniti Description

The P1223 code for Infiniti vehicles indicates a problem with the Throttle Position Sensor 2 Circuit, specifically a low input signal. The throttle position sensor (TPS) is a crucial component that monitors the position of the throttle valve in the engine. This information is used by the engine control module (ECM) to determine the amount of air entering the engine, which in turn affects the fuel delivery and ignition timing.

OBDII Code P1223 Infiniti - Throttle Position Sensor 2 Circuit Low Input
P1223 Infiniti Code - Throttle Position Sensor 2 Circuit Low Input

Common Causes of P1223 Infiniti

  1. Faulty Throttle Position Sensor 2
  2. Wiring issues or shorts in the TPS 2 circuit
  3. Corrosion or poor connections in the sensor wiring
  4. ECM software or hardware issues
  5. Mechanical issues with the throttle body

Symptoms of P1223 Infiniti

  1. Reduced engine power
  2. Poor acceleration
  3. Rough idling
  4. Stalling or hesitation during acceleration
  5. Check Engine Light illuminated on the dashboard

How to Fix P1223 Infiniti

  1. Begin by performing a visual inspection of the TPS 2 wiring and connections to check for any visible damage, corrosion, or loose connections.
  2. Use a multimeter to test the voltage output of the Throttle Position Sensor 2. Compare the readings to the manufacturer's specifications to determine if the sensor is functioning correctly.
  3. If the sensor is faulty, replace it with a new, OEM-approved part. Calibrate the new sensor according to the manufacturer's instructions.
  4. Clear the diagnostic trouble codes from the ECM using an OBD-II scanner and test drive the vehicle to ensure the issue has been resolved.
  5. If the problem persists, further diagnosis may be required to check for wiring issues, ECM malfunctions, or mechanical problems with the throttle body.

Cost to Fix P1223 Infiniti

The typical repair costs for addressing a Throttle Position Sensor 2 Circuit Low Input issue can vary depending on the specific cause of the problem and the cost of parts and labor in your area. On average, the cost of replacing a throttle position sensor ranges from $100 to $300, including parts and labor. Additional diagnostic time and labor rates at auto repair shops can vary between $80 and $150 per hour. It's recommended to consult with a professional mechanic to get an accurate estimate based on your vehicle's make and model.

When is the Code Detected?

An excessively low voltage from the Throttle Position (TP) sensor 2 is sent to Engine Control Module (ECM).

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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.

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