AutoCodes – Nissan – P0603 2011 Nissan Pathfinder

P0603 2011 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 2011 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 2,996

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 2011 Nissan Pathfinder Description

OBDII Code P0603 2011 Nissan Pathfinder - Engine Control Module Power Supply Circuit - AutoCodes.com — P0603 2011 Nissan Pathfinder Code - Engine Control Module Power Supply Circuit

What does this mean?

What are the Possible Causes of the DTC P0603 2011 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ECM Outdated Program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 2011 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 2011 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 2011 Nissan Pathfinder code?

Need more information on how to fix the P0603 2011 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 2011 Nissan Pathfinder Code

1. What does OBDII code P0603 mean for a 2011 Nissan Pathfinder?

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

2. What are common symptoms associated with OBDII code P0603 in a Nissan Pathfinder?

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

3. What are possible causes of the P0603 code in a 2011 Nissan Pathfinder?

- The code may be triggered by a faulty ECM power supply relay, damaged wiring in the power supply circuit, or a defective ECM itself.

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

- A thorough inspection of the ECM power supply circuit, including checking the relay, wiring, and connections, is necessary. Testing the voltage output is also recommended.

5. Can I continue driving my Nissan Pathfinder with OBDII code P0603?

- It is not recommended to drive the vehicle with this code present, as it can lead to further damage and potential safety hazards. It is best to address the issue promptly.

6. How can I repair OBDII code P0603 in my 2011 Nissan Pathfinder?

- Repair options include replacing a faulty ECM power supply relay, repairing damaged wiring, or replacing the ECM if deemed necessary.

7. Are there any DIY tips for fixing OBDII code P0603 in a Nissan Pathfinder?

- DIY enthusiasts with automotive repair knowledge can attempt to inspect and test the ECM power supply circuit components, but professional diagnosis and repair are recommended for accurate resolution.

8. Is it necessary to reset the OBDII code P0603 after repairs are made on a Nissan Pathfinder?

- Yes, it is important to clear the code using an OBDII scanner after repairs to reset the ECM and ensure the issue has been resolved.

9. Will OBDII code P0603 cause my Nissan Pathfinder to fail an emissions test?

- Yes, this code can cause your vehicle to fail an emissions test due to the impact on engine performance and emissions control systems.

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

- Regular maintenance, including checking and ensuring the proper functioning of the ECM power supply circuit components, can help prevent the reoccurrence of this code.