AutoCodes – Infiniti – P0605 Infiniti

P0605 Infiniti Code - Engine Control Module Fault

Quick Answer

The Engine Control Module (ECM) continuously monitors its own internal memory status, internal circuits, and output signals transmitted to the throttle actuator. Common causes include Engine Control Module (ECM) may be faulty, ECM harness power supply circuit is open or shorted, ECM harness ground circuit is open or shorted. 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: P0605 Infiniti indicates Engine Control Module Fault.
Common causes: Common causes include Engine Control Module (ECM) may be faulty, ECM harness power supply circuit is open or shorted, ECM harness ground circuit is open or shorted.
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 25,212

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 May 22, 2019

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0605 Infiniti Description

The Engine Control Module (ECM) continuously monitors its own internal memory status, internal circuits, and output signals transmitted to the throttle actuator. This self-check insures that the ECM is functioning properly. If any malfunction is detected, the ECM sets the P0605 code and illuminates the MIL.

OBDII Code P0605 Infiniti - Engine Control Module Fault - AutoCodes.com — P0605 Infiniti Code - Engine Control Module Fault

What does this mean?

What are the Possible Causes of the DTC P0605 Infiniti?

Engine Control Module (ECM) may be faulty
ECM harness power supply circuit is open or shorted
ECM harness ground circuit is open or shorted

How to Fix the DTC P0605 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

Try erasing the code first, if the light comes back ON you may have to replace the ECM to repair the problem.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0605 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 P0605 Infiniti code?

Need more information on how to fix the P0605 Infiniti code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0605 Infiniti code diagnosed by a professional: Find a repair shop in your area

Information for Specific Infiniti Models

P0605 2003 Infiniti G35 — Engine Control Module Fault
P0605 2004 Infiniti G35 — Engine Control Module Fault
P0605 2005 Infiniti G35 — Engine Control Module Fault
P0605 2006 Infiniti G35 — Engine Control Module Fault

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 P0605 Infiniti Code

1. What does the OBDII code P0605 mean for an Infiniti?

P0605 indicates an internal fault in the Engine Control Module (ECM), specifically related to the ECM's Read-Only Memory (ROM).

2. What are the common symptoms of a P0605 code in an Infiniti?

Symptoms may include poor engine performance, difficulty starting, stalling, reduced fuel efficiency, or the vehicle going into limp mode.

3. What causes the P0605 code to appear in an Infiniti?

The code can be caused by a faulty ECM, software corruption, electrical issues like a bad ground or wiring short, or damage from water or heat.

4. Can I drive my Infiniti with a P0605 code?

While the car may still run, driving with a P0605 code is not recommended as it can cause further damage to the engine or related systems.

5. How is the P0605 code diagnosed in an Infiniti?

A technician will use a scan tool to read the code, inspect the ECM for physical or electrical damage, and test the related circuits and connectors.

6. Does a P0605 code mean the ECM must be replaced?

Not always. Sometimes the issue can be resolved with reprogramming or repairing wiring, but if the ECM is irreparably damaged, replacement is necessary.

7. How much does it cost to fix a P0605 code in an Infiniti?

Repair costs can vary widely, from $100 for minor electrical repairs to $1,000 or more for ECM replacement and programming.

8. Can a P0605 code be triggered by a weak battery?

Yes, a weak or failing battery can cause voltage irregularities that might trigger the P0605 code.

9. What tools are needed to fix a P0605 code in an Infiniti?

Tools may include an OBDII scanner, multimeter, and sometimes a specialized ECM reprogramming tool if re-flashing is required.

10. How can I prevent the P0605 code from recurring in my Infiniti?

Maintain the vehicle's electrical system, avoid prolonged exposure to moisture near the ECM, and ensure any software updates are performed as recommended by the manufacturer.