AutoCodes – Ford – P0603 2008 Ford Fusion

P0603 2008 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 2008 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.

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Code Popularity 2,908

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 2008 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 2008 Ford Fusion - ECM Keep Alive Memory Test Error - AutoCodes.com — P0603 2008 Ford Fusion Code - ECM Keep Alive Memory Test Error

What does this mean?

What are the Possible Causes of the DTC P0603 2008 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 2008 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 2008 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 2008 Ford Fusion code?

Need more information on how to fix the P0603 2008 Ford Fusion 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 2008 Ford Fusion Code

1. What does the OBDII code P0603 on a 2008 Ford Fusion mean?

The code P0603 indicates an ECM Keep Alive Memory Test Error on the 2008 Ford Fusion.

2. What are the common symptoms of the ECM Keep Alive Memory Test Error (P0603) in a 2008 Ford Fusion?

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

3. What are the possible causes of the ECM Keep Alive Memory Test Error (P0603) in a 2008 Ford Fusion?

Potential causes include a faulty ECM, a drained or weak vehicle battery, wiring issues, or a software malfunction.

4. How can I diagnose the ECM Keep Alive Memory Test Error (P0603) in my 2008 Ford Fusion?

Diagnosing this error typically involves using a diagnostic scanner to read the trouble code, checking the battery voltage, inspecting the wiring, and potentially testing the ECM itself.

5. Can I continue driving my 2008 Ford Fusion with the ECM Keep Alive Memory Test Error (P0603)?

It is not recommended to drive your vehicle with this error code present, as it can lead to performance issues and potential further damage to the engine.

6. How can I repair the ECM Keep Alive Memory Test Error (P0603) in my 2008 Ford Fusion?

Repair options may include reprogramming the ECM, replacing a faulty ECM, ensuring a strong battery connection, and addressing any wiring issues.

7. Are there any DIY tips for fixing the ECM Keep Alive Memory Test Error (P0603) in a 2008 Ford Fusion?

While some basic checks like verifying the battery connection and inspecting wiring can be done by DIY enthusiasts, resolving this error often requires professional diagnostic tools and expertise.

8. Will resetting the ECM clear the Keep Alive Memory Test Error (P0603) in my 2008 Ford Fusion?

Resetting the ECM may temporarily clear the error code, but if the underlying issue is not addressed, the code is likely to reappear after some time.

9. How much does it typically cost to repair the ECM Keep Alive Memory Test Error (P0603) in a 2008 Ford Fusion?

The cost of repairing this error can vary depending on the specific cause, but it may range from a few hundred to over a thousand dollars if an ECM replacement is needed.

10. Can I prevent the ECM Keep Alive Memory Test Error (P0603) from occurring in my 2008 Ford Fusion?

Regular vehicle maintenance, including checking the battery health and ensuring proper electrical connections, can help prevent this error code from occurring.