AutoCodes – Nissan – P0603 2012 Nissan Pathfinder

P0603 2012 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 2012 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 3,385

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 2012 Nissan Pathfinder Description

OBDII Code P0603 2012 Nissan Pathfinder - Engine Control Module Power Supply Circuit - AutoCodes.com — P0603 2012 Nissan Pathfinder Code - Engine Control Module Power Supply Circuit

What does this mean?

What are the Possible Causes of the DTC P0603 2012 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ECM Outdated Program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 2012 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 2012 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 2012 Nissan Pathfinder code?

Need more information on how to fix the P0603 2012 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 2012 Nissan Pathfinder Code

1. What does the OBDII code P0603 mean on a 2012 Nissan Pathfinder?

P0603 indicates an issue with the Engine Control Module (ECM) Power Supply Circuit, often related to a loss of power or memory retention in the ECM.

2. What are the common symptoms of the P0603 code in a 2012 Nissan Pathfinder?

Common symptoms include the check engine light turning on, poor fuel efficiency, engine stalling, difficulty starting, or loss of memory settings like radio presets.

3. What causes the P0603 code on a 2012 Nissan Pathfinder?

Causes may include a faulty ECM, a weak or failing battery, poor electrical connections, corroded wiring, or issues with the ECM power or ground supply.

4. Can a weak battery trigger the P0603 code?

Yes, a weak or failing battery can cause intermittent power loss to the ECM, leading to the P0603 code.

5. How is the P0603 code diagnosed on a 2012 Nissan Pathfinder?

A technician will inspect the battery, wiring, and ECM connections, test the alternator, and check for any other electrical system issues using a multimeter and diagnostic tools.

6. Can I drive my 2012 Nissan Pathfinder with a P0603 code?

While the vehicle may still be drivable, it is not recommended as the issue could worsen over time, potentially causing poor performance or stalling.

7. How do you fix the P0603 code on a 2012 Nissan Pathfinder?

Repairs may include replacing or reprogramming the ECM, repairing damaged wiring or connections, replacing the battery, or ensuring proper voltage to the ECM.

8. Does the P0603 code always mean the ECM is faulty?

No, the ECM is not always the culprit. The issue could be related to the battery, wiring, or other electrical components.

9. How much does it cost to fix the P0603 code on a 2012 Nissan Pathfinder?

The cost varies depending on the cause, ranging from $100 for minor wiring repairs to over $1,000 if the ECM needs replacement or reprogramming.

10. Can a DIYer fix the P0603 code on a 2012 Nissan Pathfinder?

If the issue is related to a loose connection or battery replacement, a DIYer may be able to fix it. However, ECM-related issues often require professional tools and expertise.