AutoCodes – Nissan – P0605 2005 Nissan Altima Sedan

P0605 2005 Nissan Altima Sedan 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 2005 Nissan Altima Sedan 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 6,346

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 Jun 23, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0605 2005 Nissan Altima Sedan 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 2005 Nissan Altima Sedan - Engine Control Module Fault - AutoCodes.com — P0605 2005 Nissan Altima Sedan Code - Engine Control Module Fault

What does this mean?

What are the Possible Causes of the DTC P0605 2005 Nissan Altima Sedan?

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 2005 Nissan Altima Sedan?

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.

There is a factory service bulletin for the 2005 Nissan Altima:
2005 Nissan Altima Factory Service Bulletin OBDII Code P0605

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0605 2005 Nissan Altima Sedan 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 2005 Nissan Altima Sedan code?

Need more information on how to fix the P0605 2005 Nissan Altima Sedan code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 P0605 2005 Nissan Altima Sedan Code

1. What does the OBDII code P0605 mean on a 2005 Nissan Altima Sedan?

P0605 indicates an Engine Control Module (ECM) fault, meaning the ECM's internal memory or programming has encountered an error.

2. What are the symptoms of a P0605 code in a 2005 Nissan Altima?

Common symptoms include the Check Engine Light turning on, poor engine performance, stalling, rough idling, or failure to start.

3. What causes the P0605 code to appear in a 2005 Nissan Altima?

The code can be triggered by a malfunctioning ECM, corrupted software, electrical issues like poor wiring or connections, or even a failing battery.

4. Can a bad battery cause a P0605 code in my 2005 Nissan Altima?

Yes, a weak or failing battery can cause voltage irregularities that may trigger the P0605 code by affecting ECM operation.

5. How do I fix a P0605 code on a 2005 Nissan Altima?

Start by checking the battery, wiring, and ECM connections. If no issues are found, the ECM may need reprogramming or replacement.

6. Can I drive my 2005 Nissan Altima with a P0605 code?

Driving with a P0605 code is not recommended, as the ECM fault could lead to unpredictable engine performance or stalling.

7. How much does it cost to fix a P0605 code on a 2005 Nissan Altima?

Repair costs vary; ECM reprogramming may cost $100â€“$200, while ECM replacement could range from $500 to $1,200, including labor.

8. Can a P0605 code clear itself on a 2005 Nissan Altima?

The code is unlikely to clear itself. It typically requires diagnosing and repairing the underlying issue, followed by clearing the code with a scan tool.

9. Is reprogramming the ECM a common fix for the P0605 code on a 2005 Nissan Altima?

Yes, reprogramming is often a first step if the ECM software is corrupted. However, if the ECM hardware is damaged, it may need replacement.

10. How is the P0605 code diagnosed in a 2005 Nissan Altima?

A technician will use a scan tool to confirm the code, inspect wiring and connections, test the battery and alternator, and evaluate the ECM for hardware or software issues.