AutoCodes – Nissan – P0603 2007 Nissan Maxima

P0603 2007 Nissan Maxima 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 2007 Nissan Maxima 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 4,940

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 2007 Nissan Maxima Description

OBDII Code P0603 2007 Nissan Maxima - Engine Control Module Power Supply Circuit - AutoCodes.com — P0603 2007 Nissan Maxima Code - Engine Control Module Power Supply Circuit

What does this mean?

What are the Possible Causes of the DTC P0603 2007 Nissan Maxima?

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ECM Outdated Program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 2007 Nissan Maxima?

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 2007 Nissan Maxima 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 2007 Nissan Maxima code?

Need more information on how to fix the P0603 2007 Nissan Maxima 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 P0603 2007 Nissan Maxima Code

1. What are the common symptoms of OBDII code P0603 in a 2007 Nissan Maxima?

The common symptoms include the Check Engine light being illuminated, the vehicle going into limp mode, and potential issues with engine performance.

2. What does OBDII code P0603 on a 2007 Nissan Maxima indicate?

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

3. What are the possible causes of OBDII code P0603 in a 2007 Nissan Maxima?

Possible causes include a faulty ECM power supply, damaged wiring or connectors in the power supply circuit, or issues with the ECM itself.

4. How can I diagnose the cause of OBDII code P0603 in my 2007 Nissan Maxima?

Diagnosing the issue may involve checking the power supply to the ECM, inspecting the wiring and connectors for damage, and testing the ECM for proper functionality.

5. Can OBDII code P0603 in a 2007 Nissan Maxima be repaired without professional help?

While some basic troubleshooting steps can be performed by DIY enthusiasts, diagnosing and repairing the specific cause of P0603 may require professional automotive expertise.

6. Is it safe to continue driving my 2007 Nissan Maxima with OBDII code P0603 present?

It is not recommended to continue driving your vehicle with OBDII code P0603 present, as it can lead to further damage or performance issues.

7. How much does it typically cost to repair OBDII code P0603 in a 2007 Nissan Maxima?

The cost of repairing OBDII code P0603 can vary depending on the cause of the issue, but it may involve replacing the ECM, repairing wiring, or addressing other related problems.

8. Can resetting the ECM clear OBDII code P0603 in a 2007 Nissan Maxima?

Resetting the ECM may temporarily clear the code, but if the underlying issue causing P0603 is not addressed, the code is likely to reappear.

9. Are there any preventive measures to avoid OBDII code P0603 in a 2007 Nissan Maxima?

Regular maintenance, checking for any signs of wiring damage, and addressing any electrical issues promptly can help prevent the occurrence of OBDII code P0603.

10. How important is it to address OBDII code P0603 in a 2007 Nissan Maxima promptly?

It is important to address OBDII code P0603 promptly to prevent potential damage to the ECM and ensure the proper functioning of the engine control system in your 2007 Nissan Maxima.