P0603 2006 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 2006 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 2006 Ford Fusion Description
What are the Possible Causes of the DTC P0603 2006 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 2006 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 2006 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.
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Frequently Asked Questions about P0603 2006 Ford Fusion Code
1. What does OBDII code P0603 mean on a 2006 Ford Fusion?
P0603 indicates an ECM Keep Alive Memory (KAM) test error, meaning the Engine Control Module (ECM) has detected an issue maintaining stored data when the vehicle is turned off.
2. What are the common symptoms of code P0603 on a 2006 Ford Fusion?
Symptoms may include erratic engine performance, poor fuel economy, difficulty starting, and the Check Engine Light turning on.
3. What causes code P0603 in a 2006 Ford Fusion?
Common causes include a weak or disconnected battery, faulty ECM, wiring problems, or issues with the Keep Alive Memory circuit.
4. Can a weak battery trigger code P0603?
Yes, a weak or failing battery can interrupt the ECM’s ability to retain Keep Alive Memory data, leading to this code.
5. How do I fix code P0603 on a 2006 Ford Fusion?
Start by checking the battery condition, ensuring all connections are secure, inspecting wiring to the ECM, and replacing the ECM if necessary.
6. Is it safe to drive with code P0603 on a 2006 Ford Fusion?
Generally, the vehicle may remain drivable, but it could experience performance issues. It’s best to diagnose and fix the problem promptly.
7. Can disconnecting the battery clear code P0603?
Disconnecting the battery may clear the code temporarily, but if the underlying issue isn’t resolved, the code will likely return.
8. Does code P0603 always mean the ECM is bad?
No, while a faulty ECM is possible, the issue could also stem from battery or wiring problems. Further diagnosis is required.
9. How much does it cost to repair code P0603 on a 2006 Ford Fusion?
The repair cost varies based on the cause, ranging from a battery replacement ($100-$200) to an ECM replacement ($500-$1,200).
10. Can a faulty alternator cause code P0603?
Yes, a malfunctioning alternator can result in unstable voltage, potentially affecting the ECM’s ability to retain memory and triggering this code.
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