AutoCodes – Nissan – P0603 2012 Nissan Sentra

P0603 2012 Nissan Sentra 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 Sentra 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 6,091

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 Sentra Description

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

What does this mean?

What are the Possible Causes of the DTC P0603 2012 Nissan Sentra?

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ECM Outdated Program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 Sentra?

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 Sentra 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 Sentra code?

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

What does the OBDII code P0603 mean for a 2012 Nissan Sentra?

P0603 indicates a malfunction in the Engine Control Module (ECM) power supply circuit, which suggests that the ECM is detecting an issue with its internal power supply.

What are common symptoms associated with the P0603 code?

Common symptoms may include check engine light illumination, reduced engine performance, stalling, or failure to start.

What can cause the P0603 code to trigger in a 2012 Nissan Sentra?

Possible causes include faulty ECM, poor electrical connections, blown fuses, or issues with the vehicle's wiring harness related to the ECM.

How can I diagnose the P0603 code?

To diagnose, start with a visual inspection of the ECM connections and wiring. Use a multimeter to check for proper voltage and continuity in the power supply circuit, and check for any blown fuses.

What repair steps can be taken to fix the P0603 code?

Repair steps may include replacing the ECM if it is defective, repairing or replacing damaged wiring or connectors, and ensuring all electrical connections are secure and free of corrosion.

Can I continue to drive my 2012 Nissan Sentra with the P0603 code?

While it may be possible to drive, it is not recommended as it can lead to further damage or performance issues. It's best to address the code promptly.

Will clearing the P0603 code without repairs help?

Clearing the code may turn off the check engine light temporarily, but the underlying issue will remain, and the code is likely to return.

Is the P0603 code specific to the Nissan Sentra?

No, the P0603 code is a generic OBDII code that can appear in various makes and models, although the specific symptoms and repair procedures may vary.

What should I do if the P0603 code keeps coming back after repairs?

If the code persists, further diagnostics may be needed to check for other related issues such as grounding problems, or potentially a faulty replacement ECM.