AutoCodes – Ford – P0603 2012 Ford Fusion

P0603 2012 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 2012 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 2,458

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 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 2012 Ford Fusion - ECM Keep Alive Memory Test Error - AutoCodes.com — P0603 2012 Ford Fusion Code - ECM Keep Alive Memory Test Error

What does this mean?

What are the Possible Causes of the DTC P0603 2012 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 2012 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 2012 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 2012 Ford Fusion code?

Need more information on how to fix the P0603 2012 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 2012 Ford Fusion Code

1. What does the OBDII code P0603 on a 2012 Ford Fusion indicate?

The code P0603 indicates an ECM Keep Alive Memory Test Error on the 2012 Ford Fusion.

2. What are the common symptoms of an ECM Keep Alive Memory Test Error on a 2012 Ford Fusion?

Common symptoms include the vehicle stalling, rough idle, loss of power, and the check engine light being illuminated.

3. What are some potential causes of the ECM Keep Alive Memory Test Error on a 2012 Ford Fusion?

Potential causes include a faulty ECM, a dead or weak battery, poor electrical connections, or a software issue.

4. How can I diagnose the ECM Keep Alive Memory Test Error on my 2012 Ford Fusion?

Diagnosing the issue typically involves using a diagnostic scanner to read the trouble codes and inspecting the battery and electrical connections for any issues.

5. Can I still drive my 2012 Ford Fusion with the ECM Keep Alive Memory Test Error code P0603?

It is generally not recommended to drive the vehicle with this code as it can lead to further damage and potential safety risks.

6. How can I repair the ECM Keep Alive Memory Test Error on my 2012 Ford Fusion?

Repairing the issue may involve reprogramming the ECM, replacing the ECM if faulty, ensuring the battery is in good condition, and checking for any loose connections.

7. Will resetting the ECM clear the P0603 code on my 2012 Ford Fusion?

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

8. Is it possible to prevent the ECM Keep Alive Memory Test Error from occurring on my 2012 Ford Fusion?

Regular maintenance, such as keeping the battery in good condition and addressing any electrical issues promptly, can help prevent this error from occurring.

9. How much does it typically cost to repair the ECM Keep Alive Memory Test Error on a 2012 Ford Fusion?

The cost of repair can vary depending on the exact cause of the issue, but it may range from a few hundred to a thousand dollars.

10. Can I fix the ECM Keep Alive Memory Test Error on my 2012 Ford Fusion myself?

While some simple troubleshooting steps can be done by DIY enthusiasts, complex repairs or reprogramming of the ECM may require professional help from a mechanic or dealership.