P0603 2010 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 2010 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.
Code P0603 2010 Ford Fusion Description
What are the Possible Causes of the DTC P0603 2010 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 2010 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.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0603 2010 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 2010 Ford Fusion code?
Need more information on how to fix the P0603 2010 Ford Fusion code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P0603 2010 Ford Fusion code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P0603 2010 Ford Fusion Code
What does the OBDII code P0603 mean on a 2010 Ford Fusion?
P0603 refers to an ECM Keep Alive Memory (KAM) Test Error, indicating a problem with the memory that stores data for engine management between key cycles.
What are the symptoms of code P0603 in a 2010 Ford Fusion?
Common symptoms include the check engine light turning on, poor fuel economy, rough idling, or intermittent loss of power.
What causes the P0603 code in a 2010 Ford Fusion?
The code can be caused by a weak or disconnected battery, a faulty ECM, electrical wiring issues, or aftermarket modifications that interfere with ECM communication.
Can a weak battery trigger the P0603 code in a 2010 Ford Fusion?
Yes, a weak or failing battery can disrupt the ECM's ability to retain memory, leading to the P0603 code.
How do you diagnose a P0603 code in a 2010 Ford Fusion?
Start by checking the battery voltage and connections, inspecting the wiring and grounds related to the ECM, and scanning for additional codes to rule out other issues.
Can driving with a P0603 code damage the 2010 Ford Fusion?
Generally, driving with this code won’t cause immediate damage, but it can lead to unstable engine performance or worsen underlying issues if left unresolved.
How can you fix the P0603 code on a 2010 Ford Fusion?
Repairs may include replacing the battery, checking and fixing wiring or ground connections, or reprogramming or replacing the ECM if necessary.
Can aftermarket modifications cause a P0603 code in a 2010 Ford Fusion?
Yes, aftermarket tuning devices or improperly installed accessories can interfere with ECM functions and trigger the code.
Is replacing the ECM always required for a P0603 code in a 2010 Ford Fusion?
No, replacing the ECM is not always necessary. Start with simpler fixes like battery maintenance and inspecting wiring before considering ECM replacement.
How much does it cost to fix a P0603 code on a 2010 Ford Fusion?
The cost can range from $50 for a battery or wiring fix to over $500 if ECM replacement or reprogramming is required.
Discuss the causes and fixes for P0603 2010 Ford Fusion OBDII Code
Code P0603 2010 Ford Fusion comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
