AutoCodes – Nissan – P0603 2008 Nissan Pathfinder

P0603 2008 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 2008 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 4,399

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 2008 Nissan Pathfinder Description

OBDII Code P0603 2008 Nissan Pathfinder - Engine Control Module Power Supply Circuit - AutoCodes.com — P0603 2008 Nissan Pathfinder Code - Engine Control Module Power Supply Circuit

What does this mean?

What are the Possible Causes of the DTC P0603 2008 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ECM Outdated Program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 2008 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 2008 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 2008 Nissan Pathfinder code?

Need more information on how to fix the P0603 2008 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 2008 Nissan Pathfinder Code

1. What does OBDII code P0603 mean for a 2008 Nissan Pathfinder?

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

2. What are the common symptoms of OBDII code P0603 in a 2008 Nissan Pathfinder?

Common symptoms include engine stalling, rough idling, poor acceleration, and the illumination of the Check Engine light.

3. What are the possible causes of OBDII code P0603 in a 2008 Nissan Pathfinder?

Potential causes of this code include a faulty ECM power supply circuit, loose or corroded wiring connections, or a defective ECM.

4. How can I diagnose the OBDII code P0603 in my 2008 Nissan Pathfinder?

Diagnosing this code involves checking the ECM power supply circuit for continuity, inspecting wiring connections for damage, and testing the ECM for proper functionality.

5. Can a DIYer repair OBDII code P0603 in a 2008 Nissan Pathfinder?

While some basic troubleshooting steps can be performed by a DIYer, repairing this code may require specialized tools and expertise. It is recommended to consult a professional mechanic for accurate diagnosis and repair.

6. What are the potential consequences of ignoring OBDII code P0603 in a 2008 Nissan Pathfinder?

Ignoring this code can lead to further engine performance issues, decreased fuel efficiency, and potential damage to other components of the vehicle.

7. Is it safe to drive my 2008 Nissan Pathfinder with OBDII code P0603?

It is not recommended to drive the vehicle with this code present, as it can affect the engine's performance and reliability. Have the issue diagnosed and repaired promptly.

8. How much does it typically cost to repair OBDII code P0603 in a 2008 Nissan Pathfinder?

The cost of repairing this code can vary depending on the extent of the issue and the specific repairs needed. It is advisable to obtain quotes from different mechanics for an accurate estimate.

9. Can a reset or clearing of the code fix OBDII code P0603 in a 2008 Nissan Pathfinder?

Clearing the code may temporarily turn off the Check Engine light, but it will not fix the underlying issue causing the code. Proper diagnosis and repair are necessary to resolve the problem.

10. How can I prevent OBDII code P0603 from occurring in my 2008 Nissan Pathfinder?

Regular maintenance, such as checking and cleaning electrical connections, inspecting wiring harnesses for damage, and ensuring proper voltage supply to the ECM, can help prevent this code from appearing.