P0603 2010 Nissan Altima Sedan Code - Engine Control Module Power Supply Circuit
Quick Answer
Battery voltage is supplied to the Engine Control Module (ECM) even when the ignition switch is turned OFF for the ECM memory function of the DTC memory, the air-fuel ratio feedback compensation value memory, the idle air volume learning value memory, etc. Common causes include Loose or poor battery terminal connection, Low battery charge, Faulty Engine Control Module (ECM). 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 Nissan Altima Sedan indicates Engine Control Module Power Supply Circuit.
- Common causes
- Common causes include Loose or poor battery terminal connection, Low battery charge, Faulty Engine Control Module (ECM).
- 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 Nissan Altima Sedan Description
What are the Possible Causes of the DTC P0603 2010 Nissan Altima Sedan?
- Loose or poor battery terminal connection
- Low battery charge
- Faulty Engine Control Module (ECM)
- ECM power supply circuit is open or shorted
- ECM Outdated Program
How to Fix the DTC P0603 2010 Nissan Altima Sedan?
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 Nissan Altima Sedan 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 2010 Nissan Altima Sedan Code
1. What does the OBDII code P0603 mean on a 2010 Nissan Altima?
P0603 indicates an issue with the Engine Control Module (ECM) Power Supply Circuit, often related to the ECM's memory or backup power.
2. What are the common symptoms of a P0603 code?
Symptoms may include engine stalling, difficulty starting, reduced fuel efficiency, or the check engine light being illuminated.
3. What causes the P0603 code to appear on a 2010 Nissan Altima?
Causes can include a faulty ECM, a weak or disconnected battery, damaged wiring, or issues with the ignition switch or power supply circuit.
4. Can a weak battery trigger the P0603 code?
Yes, low battery voltage or a weak battery can cause the ECM to lose memory, triggering the P0603 code.
5. How do I troubleshoot the P0603 code on my Nissan Altima?
Start by checking the battery and charging system, inspecting wiring and connectors near the ECM, and testing the ECM's power and ground connections.
6. Is it safe to drive with a P0603 code?
While the car may still drive, the P0603 code can lead to erratic engine behavior or stalling, so it’s best to address the issue promptly.
7. How do I fix a P0603 code on a 2010 Nissan Altima?
Repairs may include replacing a weak battery, fixing damaged wiring, ensuring proper ECM grounding, or replacing the ECM if it’s found to be defective.
8. Can resetting the ECM clear the P0603 code?
Resetting the ECM may temporarily clear the code, but if the underlying issue isn’t resolved, the code will likely return.
9. How much does it cost to fix a P0603 code?
Costs vary depending on the cause. Battery replacement may cost $100-$300, while ECM replacement can range from $500-$1,500 or more.
10. Do I need a professional mechanic to resolve the P0603 code?
While some issues like checking the battery can be handled by a DIYer, diagnosing and repairing the ECM or wiring is best left to a professional.
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