AutoCodes – Nissan – P0603 2009 Nissan Pathfinder

P0603 2009 Nissan Pathfinder Code - Engine Control Module Power Supply Circuit

Quick Answer

Battery voltage is supplied to the Engine Control Module (ECM) even when the ignition switch is turned OFF for the ECM memory function of the DTC memory, the air-fuel ratio feedback compensation value memory, the idle air volume learning value memory, etc. Common causes include Loose or poor battery terminal connection, Low battery charge, Faulty Engine Control Module (ECM). 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: P0603 2009 Nissan Pathfinder indicates Engine Control Module Power Supply Circuit.
Common causes: Common causes include Loose or poor battery terminal connection, Low battery charge, Faulty Engine Control Module (ECM).
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 3,052

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 14, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0603 2009 Nissan Pathfinder Description

OBDII Code P0603 2009 Nissan Pathfinder - Engine Control Module Power Supply Circuit - AutoCodes.com — P0603 2009 Nissan Pathfinder Code - Engine Control Module Power Supply Circuit

What does this mean?

What are the Possible Causes of the DTC P0603 2009 Nissan Pathfinder?

Loose or poor battery terminal connection
Low battery charge
Faulty Engine Control Module (ECM)
ECM power supply circuit is open or shorted
ECM Outdated Program

How to Fix the DTC P0603 2009 Nissan Pathfinder?

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 charging the vehicles battery and clean terminal, once the battery is charged and the terminals are clean and secure, erase code. If the code comes back ON you may have to reprogram or replaced ECM

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0603 2009 Nissan Pathfinder 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 P0603 2009 Nissan Pathfinder code?

Need more information on how to fix the P0603 2009 Nissan Pathfinder code? Get Access to Factory Service Manuals

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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 P0603 2009 Nissan Pathfinder Code

1. What does OBDII code P0603 on a 2009 Nissan Pathfinder indicate?

The code P0603 in a 2009 Nissan Pathfinder indicates a malfunction in the Engine Control Module (ECM) power supply circuit.

2. What are the common symptoms of OBDII code P0603 on a 2009 Nissan Pathfinder?

Common symptoms of code P0603 may include engine stalling, rough idling, poor acceleration, and illuminated Check Engine Light.

3. What are the possible causes of OBDII code P0603 on a 2009 Nissan Pathfinder?

Potential causes of code P0603 can include a faulty ECM, wiring issues in the power supply circuit, blown fuses, or a weak battery.

4. How can I diagnose OBDII code P0603 on my 2009 Nissan Pathfinder?

Diagnosing code P0603 may involve checking the power supply to the ECM, inspecting wiring for damage, testing fuses, and performing a thorough ECM scan using a diagnostic tool.

5. Can I still drive my 2009 Nissan Pathfinder with OBDII code P0603?

It is not recommended to drive your vehicle with code P0603 as it can lead to potential engine performance issues and further damage if left unaddressed.

6. How do I repair OBDII code P0603 on a 2009 Nissan Pathfinder?

Repairing code P0603 may involve replacing a faulty ECM, repairing damaged wiring, ensuring proper power supply, and clearing the trouble code with a diagnostic tool.

7. Is it safe to reset the OBDII code P0603 on my 2009 Nissan Pathfinder without fixing the underlying issue?

Resetting the code without addressing the underlying problem may temporarily turn off the Check Engine Light, but the issue will likely resurface, causing potential engine problems.

8. Can a DIY enthusiast fix OBDII code P0603 on a 2009 Nissan Pathfinder?

While some aspects of diagnosing and repairing code P0603 can be done by a DIY enthusiast with the right tools and knowledge, it is recommended to seek professional help for accurate diagnosis and repair.

9. How much does it typically cost to fix OBDII code P0603 on a 2009 Nissan Pathfinder?

The cost of fixing code P0603 can vary depending on the cause of the issue, but it may involve expenses for parts replacement, wiring repairs, and labor charges at a repair shop.

10. How can I prevent OBDII code P0603 from occurring on my 2009 Nissan Pathfinder in the future?

To prevent code P0603, it is essential to maintain your vehicle's electrical system, ensure regular battery checks, address any wiring issues promptly, and follow the manufacturer's recommended maintenance schedule.