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P1128 2004 Infiniti G35 Code - Throttle Control Motor Circuit Short

Quick Answer

The P1128 code on a 2004 Infiniti G35 indicates a problem with the throttle control motor circuit. Common causes include Damaged or frayed wiring harness, Poor connections in the throttle control motor circuit, Water intrusion or corrosion in the 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
P1128 2004 Infiniti G35 indicates Throttle Control Motor Circuit Short.
Common causes
Common causes include Damaged or frayed wiring harness, Poor connections in the throttle control motor circuit, Water intrusion or corrosion in the 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 14, 2024
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Code P1128 2004 Infiniti G35 Description

The P1128 code on a 2004 Infiniti G35 indicates a problem with the throttle control motor circuit. This code is triggered when the Engine Control Module (ECM) detects a short in the circuit that controls the throttle motor. The throttle control motor is responsible for adjusting the throttle valve opening angle based on input from the accelerator pedal position sensor. When a short circuit occurs, it can disrupt communication between the ECM and the throttle control motor, leading to erratic throttle response and potentially unsafe driving conditions.

OBDII Code P1128 2004 Infiniti G35 - Throttle Control Motor Circuit Short
P1128 2004 Infiniti G35 Code - Throttle Control Motor Circuit Short

Common Causes of P1128 2004 Infiniti G35

  1. Damaged or frayed wiring harness
  2. Poor connections in the throttle control motor circuit
  3. Water intrusion or corrosion in the wiring
  4. Faulty throttle control motor
  5. ECM malfunction

Symptoms of P1128 2004 Infiniti G35

  1. Reduced engine power
  2. Hesitation or stalling during acceleration
  3. Rough idling
  4. Vehicle going into limp mode

How to Fix P1128 2004 Infiniti G35

  1. Diagnose the issue by using a scan tool to retrieve the trouble code and inspect the throttle control motor circuit for any visible damage.
  2. Check the wiring harness for any signs of damage, such as fraying or corrosion. Repair or replace any damaged wires.
  3. Test the throttle control motor and its connections to ensure proper functionality. Replace the throttle control motor if necessary.
  4. Clear the trouble code from the ECM's memory and perform a test drive to verify that the issue has been resolved.
  5. If the problem persists, further diagnostics may be required to identify any underlying issues with the ECM or other related components.

Cost to Fix P1128 2004 Infiniti G35

The typical repair costs for addressing a throttle control motor circuit short can range from $200 to $500, depending on the extent of the damage and the specific components that need to be replaced. This estimate includes parts and labor. However, it's important to note that the actual cost may vary based on factors such as location, vehicle make and model, and the rates charged by auto repair shops. It's advisable to consult with a qualified mechanic to get an accurate estimate for your specific situation.

When is the Code Detected?

Engine Control Module (ECM) detects short both circuits between ECM and throttle control motor.

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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 P1128 2004 Infiniti G35 Code

1. What does the OBDII code P1128 mean on a 2004 Infiniti G35?

P1128 indicates a short circuit in the throttle control motor circuit, which affects the electronic throttle system's ability to regulate airflow into the engine.

2. What are the common symptoms of the P1128 code on a 2004 Infiniti G35?

Symptoms may include reduced engine performance, poor throttle response, the engine going into limp mode, and illumination of the check engine light.

3. What causes the P1128 code to appear on a 2004 Infiniti G35?

Possible causes include a damaged throttle control motor, faulty wiring or connectors in the throttle control circuit, or a malfunctioning Engine Control Module (ECM).

4. Can I drive my 2004 Infiniti G35 with the P1128 code?

It’s not recommended to drive with this code, as the vehicle may enter limp mode and experience reduced throttle control, potentially leading to unsafe driving conditions.

5. How can I diagnose the P1128 code on my 2004 Infiniti G35?

Start by inspecting the throttle control motor wiring and connectors for damage, test the throttle control motor for proper function, and check the ECM for any related issues.

6. How do I fix the P1128 code on my 2004 Infiniti G35?

Repairs may include replacing damaged wiring or connectors, repairing or replacing the throttle control motor, or replacing a faulty ECM if necessary.

7. How much does it cost to repair the P1128 code on a 2004 Infiniti G35?

Repair costs can vary but typically range from $150 to $500, depending on whether the issue involves wiring repairs, throttle control motor replacement, or ECM replacement.

8. Can a dirty throttle body cause the P1128 code?

While unlikely, a dirty throttle body can contribute to throttle control issues. Cleaning it may help, but it’s more important to check for electrical shorts in the throttle motor circuit.

9. What tools do I need to troubleshoot the P1128 code on a 2004 Infiniti G35?

You’ll need an OBDII scanner, a multimeter to check the electrical circuit, and possibly a throttle body cleaning kit if debris is suspected.

10. What happens if I ignore the P1128 code on my 2004 Infiniti G35?

Ignoring the code can lead to poor engine performance, worsening throttle control problems, and potential damage to other components in the electronic throttle system.

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