AutoCodes – Infiniti – P1128 Infiniti

P1128 Infiniti Code - Throttle Control Motor Circuit Short

Quick Answer

The throttle control motor is operated by the Engine Control Module (ECM) and it opens and closes the throttle valve. Common causes include Faulty Throttle Control Motor, Throttle Control Motor harness is open or shorted, Throttle Control Motor 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: P1128 Infiniti indicates Throttle Control Motor Circuit Short.
Common causes: Common causes include Faulty Throttle Control Motor, Throttle Control Motor harness is open or shorted, Throttle Control Motor 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.

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Code Popularity 7,256

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 04, 2023

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P1128 Infiniti Description

The throttle control motor is operated by the Engine Control Module (ECM) and it opens and closes the throttle valve.
The current opening angle of the throttle valve is detected by the throttle position sensor and it provides feedback to the ECM to control the throttle control motor to make the throttle valve opening angle properly in response to driving condition.

OBDII Code P1128 Infiniti - Throttle Control Motor Circuit Short - AutoCodes.com — P1128 Infiniti Code - Throttle Control Motor Circuit Short

What does this mean?

What are the Possible Causes of the DTC P1128 Infiniti?

Faulty Throttle Control Motor
Throttle Control Motor harness is open or shorted
Throttle Control Motor circuit poor electrical connection

How to Fix the DTC P1128 Infiniti?

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 P1128 Infiniti 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.

Need more information about the P1128 Infiniti code?

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Information for Specific Infiniti Models

P1128 2003 Infiniti G35 — Throttle Control Motor Circuit Short
P1128 2004 Infiniti G35 — Throttle Control Motor Circuit Short
P1128 2005 Infiniti G35 — Throttle Control Motor Circuit Short

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.