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P0221 2003 Infiniti G35 Code - Throttle/Pedal Position Sensor Circuit Range/Performance Problem

Quick Answer

The P0221 diagnostic trouble code (DTC) for a 2003 Infiniti G35 indicates a Throttle/Pedal Position Sensor Circuit Range/Performance Problem. Common causes include Faulty throttle position sensor, Damaged wiring or connectors in the sensor circuit, Malfunctioning accelerator pedal position sensor. 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
P0221 2003 Infiniti G35 indicates Throttle/Pedal Position Sensor Circuit Range/Performance Problem.
Common causes
Common causes include Faulty throttle position sensor, Damaged wiring or connectors in the sensor circuit, Malfunctioning accelerator pedal position sensor.
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 16, 2024
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Code P0221 2003 Infiniti G35 Description

The P0221 diagnostic trouble code (DTC) for a 2003 Infiniti G35 indicates a Throttle/Pedal Position Sensor Circuit Range/Performance Problem. This code is triggered when the Engine Control Module (ECM) detects that the voltage signal from the throttle position sensor (TPS) or pedal position sensor (PPS) is outside the expected range or is not performing as it should. The TPS and PPS are crucial components that provide feedback to the ECM about the position of the throttle and accelerator pedal, allowing the ECM to adjust fuel delivery and engine performance accordingly.

OBDII Code P0221 2003 Infiniti G35 - Throttle/Pedal Position Sensor Circuit Range/Performance Problem
P0221 2003 Infiniti G35 Code - Throttle/Pedal Position Sensor Circuit Range/Performance Problem

Common Causes of P0221 2003 Infiniti G35

  1. Faulty throttle position sensor
  2. Damaged wiring or connectors in the sensor circuit
  3. Malfunctioning accelerator pedal position sensor
  4. Issues with the ECM
  5. Corrosion or contamination in the sensor components

Symptoms of P0221 2003 Infiniti G35

  1. Hesitation or lack of response when pressing the accelerator pedal
  2. Rough idling or stalling
  3. Reduced fuel efficiency
  4. Engine going into limp mode
  5. Check Engine Light illuminated on the dashboard

How to Fix P0221 2003 Infiniti G35

  1. Diagnose the issue using a scan tool to retrieve the DTC and check the voltage signal from the throttle/ pedal position sensors.
  2. Inspect the wiring and connectors for any damage or corrosion, repairing or replacing as needed.
  3. Test the throttle position sensor and accelerator pedal position sensor for proper functionality, replacing if faulty.
  4. Clear the DTC from the ECM memory and perform a test drive to ensure the issue has been resolved.
  5. If the problem persists, further diagnostic testing may be required to identify any underlying issues with the ECM or other components.

Cost to Fix P0221 2003 Infiniti G35

The typical repair costs for addressing a P0221 code on a 2003 Infiniti G35 can range from $200 to $500, depending on the specific cause of the issue and the cost of parts and labor. It's important to note that diagnosis time and labor rates at auto repair shops can vary, with hourly rates typically ranging between $80 and $150. Factors such as location, vehicle make and model, and engine type can also impact the overall repair costs. For a more accurate estimate, it's recommended to check with local auto repair shops for pricing specific to your situation.

When is the Code Detected?

An excessively high voltage from the Throttle Position Sensor (TPS) 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.

Frequently Asked Questions about P0221 2003 Infiniti G35 Code

1. What does the OBDII code P0221 mean on a 2003 Infiniti G35?

P0221 indicates a "Throttle/Pedal Position Sensor Circuit Range/Performance Problem," meaning the ECM detected an issue with the throttle or accelerator pedal position sensor signals.

2. What are the common symptoms of code P0221 in a 2003 Infiniti G35?

Symptoms may include reduced engine power, poor acceleration, hesitation, stalling, or the vehicle entering "limp mode."

3. What causes the P0221 code to appear on a 2003 Infiniti G35?

Common causes include a faulty throttle position sensor (TPS), damaged or corroded wiring in the throttle circuit, a faulty accelerator pedal position sensor, or a failing ECM.

4. Can I still drive my 2003 Infiniti G35 with the P0221 code active?

While the car may still operate, it could have reduced power and hesitation. Driving in this condition can be unsafe and may cause further damage, so addressing the issue promptly is recommended.

5. How do I diagnose the P0221 code on my 2003 Infiniti G35?

Start by using an OBDII scanner to confirm the code. Then inspect the throttle position sensor, accelerator pedal position sensor, and their wiring for damage or corrosion. Testing sensor output with a multimeter may also help.

6. How can I fix the P0221 code on a 2003 Infiniti G35?

Repairs may involve replacing the throttle position sensor, repairing or replacing damaged wiring, cleaning electrical connections, or replacing the accelerator pedal position sensor if faulty.

7. Is a faulty throttle position sensor a common issue for code P0221 on a 2003 Infiniti G35?

Yes, a faulty throttle position sensor is one of the most common causes of the P0221 code.

8. How much does it cost to fix the P0221 code on a 2003 Infiniti G35?

Repair costs vary, but replacing the throttle position sensor typically costs $150–$300 for parts and labor. Wiring repairs may cost less, depending on the extent of damage.

9. Can a dirty throttle body cause the P0221 code on a 2003 Infiniti G35?

While less common, a dirty throttle body can cause issues with throttle position readings, potentially triggering the P0221 code.

10. Does the P0221 code require reprogramming the ECM after repairs on a 2003 Infiniti G35?

In most cases, ECM reprogramming isn't required, but clearing the code with an OBDII scanner and performing a throttle relearn procedure may be necessary.

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