Engine-Codes.com
Engine-Codes – Ford – P0603 2007 Ford Fusion

P0603 2007 Ford Fusion Code - ECM Keep Alive Memory Test Error

Quick Answer

The P0603 diagnostic trouble code (DTC) for a 2007 Ford Fusion indicates an error in the Engine Control Module (ECM) Keep Alive Memory Test. Common causes include Faulty ECM, Battery or alternator issues, Corroded or loose electrical connections. 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 Ford Fusion indicates ECM Keep Alive Memory Test Error.
Common causes
Common causes include Faulty ECM, Battery or alternator issues, Corroded or loose electrical connections.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 09, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P0603 2007 Ford Fusion Description

The P0603 diagnostic trouble code (DTC) for a 2007 Ford Fusion indicates an error in the Engine Control Module (ECM) Keep Alive Memory Test. The ECM is a critical component of the vehicle's onboard computer system that controls various functions, including engine performance, emissions, and transmission. The Keep Alive Memory (KAM) is a portion of the ECM that stores data such as fuel trim values, idle speed, and other parameters necessary for the engine to operate efficiently.

OBDII Code P0603 2007 Ford Fusion - ECM Keep Alive Memory Test Error
P0603 2007 Ford Fusion Code - ECM Keep Alive Memory Test Error

Common Causes of P0603 2007 Ford Fusion

  1. Faulty ECM
  2. Battery or alternator issues
  3. Corroded or loose electrical connections
  4. Wiring harness damage
  5. Software or programming issues

Symptoms of P0603 2007 Ford Fusion

  1. Engine stalling or rough idling
  2. Poor fuel economy
  3. Difficulty starting the engine
  4. Check engine light illuminated
  5. Loss of power or acceleration

How to Fix P0603 2007 Ford Fusion

  1. Begin by checking the battery voltage and ensuring it is within the proper range. If the battery is old or weak, consider replacing it.
  2. Inspect the alternator for proper operation and charging voltage. Replace if necessary.
  3. Check all electrical connections to the ECM for corrosion or looseness. Clean or tighten connections as needed.
  4. Inspect the wiring harness for any damage or exposed wires. Repair or replace damaged sections.
  5. If the above steps do not resolve the issue, the ECM may need to be reprogrammed or replaced by a qualified technician.

Cost to Fix P0603 2007 Ford Fusion

The cost of repairing a P0603 code on a 2007 Ford Fusion can vary depending on the specific cause of the issue. In general, the cost of replacing the ECM can range from $500 to $1500, including parts and labor. Keep in mind that diagnostic time and labor rates at auto repair shops can vary, so it's best to check with local shops for a more accurate estimate. Additionally, other potential causes such as battery or alternator replacement could incur additional costs.

What does this mean?

Tech Notes for P0603 2007 Ford Fusion

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

When is the Code Detected?

Indicates the ECM has experienced an internal memory fault.

Need more information about the P0603 2007 Ford Fusion code?

Need more information on how to fix the P0603 2007 Ford Fusion code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0603 2007 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 2007 Ford Fusion Code

1. What does OBDII code P0603 mean for a 2007 Ford Fusion?

The code P0603 on a 2007 Ford Fusion indicates an ECM Keep Alive Memory Test Error, suggesting a malfunction in the Engine Control Module.

2. What are the common symptoms of P0603 on a 2007 Ford Fusion?

Common symptoms of P0603 include engine stalling, rough idling, poor acceleration, and in some cases, the vehicle may fail to start.

3. What are the possible causes of the ECM Keep Alive Memory Test Error on a 2007 Ford Fusion?

Common causes of P0603 in a 2007 Ford Fusion include a faulty ECM, loose electrical connections, a drained or weak battery, or a software glitch within the engine control module.

4. How can I diagnose the P0603 code on my 2007 Ford Fusion?

To diagnose the P0603 code, a professional mechanic or a DIY enthusiast with an OBDII scanner can scan the vehicle's computer system to retrieve the specific error code, allowing for further troubleshooting.

5. Can I still drive my 2007 Ford Fusion with the P0603 code present?

It is not recommended to drive your 2007 Ford Fusion with the P0603 code present, as it may lead to potential engine performance issues and could result in further damage if left unresolved.

6. How can I repair the ECM Keep Alive Memory Test Error on my 2007 Ford Fusion?

To repair the P0603 code, you may need to replace the faulty ECM, address any loose connections, ensure the battery is in good condition, or reprogram the engine control module if a software glitch is suspected.

7. Will resetting the ECM clear the P0603 code on a 2007 Ford Fusion?

Resetting the ECM may temporarily clear the P0603 code, but if the underlying issue causing the error code is not addressed, it is likely to reoccur once the vehicle is driven again.

8. Is the repair for the P0603 code on a 2007 Ford Fusion something I can do myself?

While basic troubleshooting like checking connections and the battery can be done by a DIY enthusiast, diagnosing and repairing the ECM Keep Alive Memory Test Error may require professional assistance due to the complexity of the engine control module.

9. How much can I expect to pay to repair the P0603 code on my 2007 Ford Fusion?

The cost of repairing the P0603 code on a 2007 Ford Fusion can vary depending on the specific cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

10. Can the P0603 code on a 2007 Ford Fusion cause other problems if not fixed promptly?

If left unresolved, the P0603 code on a 2007 Ford Fusion can potentially lead to more severe engine issues, decreased fuel efficiency, and even permanent damage to the engine control module, making timely repair essential.

Discuss the causes and fixes for P0603 2007 Ford Fusion OBDII Code

Submit a New Comment

Code P0603 2007 Ford Fusion comments

No comments found for this page.