AutoCodes – Infiniti – P1229 Infiniti

P1229 Infiniti Code - Sensor Power Supply Circuit Shorted

Quick Answer

The Engine Control Module (ECM) detects the voltage of the power source for the sensor is excessively low or high. Common causes include Check harness body ground, Faulty Accelerator Pedal Position (APP) sensor, Faulty Power Steering Pressure (PSP) 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: P1229 Infiniti indicates Sensor Power Supply Circuit Shorted.
Common causes: Common causes include Check harness body ground, Faulty Accelerator Pedal Position (APP) sensor, Faulty Power Steering Pressure (PSP) 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 14,508

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Nov 05, 2022

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P1229 Infiniti Description

The Engine Control Module (ECM) detects the voltage of the power source for the sensor is excessively low or high. The ECM stops the electric throttle control actuator control, and the throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return spring. The Diagnostic Trouble Code (DTC) will be set when the ECM detects the voltage of the power source for the sensor is excessively low or high.

OBDII Code P1229 Infiniti - Sensor Power Supply Circuit Shorted - AutoCodes.com — P1229 Infiniti Code - Sensor Power Supply Circuit Shorted

What does this mean?

What are the Possible Causes of the DTC P1229 Infiniti?

Check harness body ground
Faulty Accelerator Pedal Position (APP) sensor
Faulty Power Steering Pressure (PSP) sensor
Faulty Refrigerant Pressure sensor
Faulty EVAP Control System Pressure sensor

How to Fix the DTC P1229 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 does this mean?

Code Tech Notes

Start by inspecting the connections of the harness to the body grounds.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1229 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 P1229 Infiniti code?

Need more information on how to fix the P1229 Infiniti code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1229 Infiniti code diagnosed by a professional: Find a repair shop in your area

Information for Specific Infiniti Models

P1229 2003 Infiniti G35 — Sensor Power Supply Circuit Shorted
P1229 2004 Infiniti G35 — Sensor Power Supply Circuit Shorted
P1229 2005 Infiniti G35 — Sensor Power Supply Circuit Shorted

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.