AutoCodes – Ford – P0603 2009 Ford Fusion

P0603 2009 Ford Fusion Code - ECM Keep Alive Memory Test Error

Quick Answer

Indicates the Powertrain Control Module (PCM) has experienced an internal memory concern. Common causes include Loose or poor battery terminal connection, Low battery charge, ECM power supply circuit is open or shorted. 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 2009 Ford Fusion indicates ECM Keep Alive Memory Test Error.
Common causes: Common causes include Loose or poor battery terminal connection, Low battery charge, ECM power supply circuit is open or shorted.
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.

Save to My Repairs Step-by-Step Diagnostic Guide My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 3,008

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P0603 2009 Ford Fusion Description

Indicates the Powertrain Control Module (PCM) has experienced an internal memory concern. However, there are external items that can cause this DTC.

OBDII Code P0603 2009 Ford Fusion - ECM Keep Alive Memory Test Error - AutoCodes.com — P0603 2009 Ford Fusion Code - ECM Keep Alive Memory Test Error

What does this mean?

What are the Possible Causes of the DTC P0603 2009 Ford Fusion?

Loose or poor battery terminal connection
Low battery charge
ECM power supply circuit is open or shorted
ECM Programing
Faulty ECM

How to Fix the DTC P0603 2009 Ford Fusion?

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 2009 Ford Fusion 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 2009 Ford Fusion code?

Need more information on how to fix the P0603 2009 Ford Fusion code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0603 2009 Ford Fusion code diagnosed by a professional: Find a repair shop in your area

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 2009 Ford Fusion Code

1. What does the OBDII code P0603 for a 2009 Ford Fusion mean?

The code P0603 indicates an ECM Keep Alive Memory Test Error on the 2009 Ford Fusion.

2. What are the common symptoms of ECM Keep Alive Memory Test Error (P0603) on a Ford Fusion?

Common symptoms include engine stalling, rough idle, poor acceleration, and potential issues with starting the vehicle.

3. What causes the ECM Keep Alive Memory Test Error (P0603) on a 2009 Ford Fusion?

The error is often caused by a faulty ECM (Engine Control Module), a weak car battery, or a poor electrical connection to the ECM.

4. How can I diagnose the ECM Keep Alive Memory Test Error (P0603) on my 2009 Ford Fusion?

Diagnosing the error involves using an OBDII scanner to read the code, checking the battery voltage, inspecting the ECM connections, and testing the ECM itself.

5. Can I drive my 2009 Ford Fusion with the ECM Keep Alive Memory Test Error (P0603) code?

It is not recommended to drive the vehicle with this error as it can lead to further engine performance issues and potential safety concerns.

6. How can I repair the ECM Keep Alive Memory Test Error (P0603) on my 2009 Ford Fusion?

Repair options may include replacing the ECM, ensuring a strong battery connection, or seeking professional help for further diagnostics and repairs.

7. Is it possible to reset the ECM Keep Alive Memory Test Error (P0603) code on a 2009 Ford Fusion?

Resetting the code may temporarily clear the error, but it is crucial to address the underlying issue causing the P0603 code for a lasting repair.

8. Can a DIY enthusiast fix the ECM Keep Alive Memory Test Error (P0603) on a 2009 Ford Fusion?

Depending on your skill level and access to tools, some individuals may be able to diagnose and repair the error themselves, but professional assistance is recommended for complex issues.

9. Are there any preventive measures to avoid the ECM Keep Alive Memory Test Error (P0603) on a 2009 Ford Fusion?

Regular maintenance, such as checking the battery health, ensuring proper electrical connections, and promptly addressing any engine performance issues, can help prevent this error.

10. How much does it typically cost to repair the ECM Keep Alive Memory Test Error (P0603) on a 2009 Ford Fusion?

The repair costs for this error can vary depending on the exact cause, parts needed, and labor charges, so it is advisable to obtain quotes from reputable mechanics or service centers.