P0603 2006 Infiniti G35 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 2006 Infiniti G35 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 2006 Infiniti G35 Description
What are the Possible Causes of the DTC P0603 2006 Infiniti G35?
- 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- ECM Outdated Program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 2006 Infiniti G35?
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 Infiniti G35 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 Infiniti G35 Code
1. What does OBDII code P0603 mean on a 2006 Infiniti G35?
Code P0603 indicates an issue with the Engine Control Module (ECM) Power Supply Circuit, suggesting the ECM is not receiving consistent power.
2. What are the common symptoms of code P0603 in a 2006 Infiniti G35?
Symptoms may include erratic engine behavior, difficulty starting, poor fuel efficiency, illuminated check engine light, or loss of stored memory settings.
3. What causes code P0603 on a 2006 Infiniti G35?
Common causes include a weak or failing battery, loose or corroded battery terminals, faulty ECM power relay, damaged wiring, or an internal ECM failure.
4. Can a dying car battery trigger code P0603?
Yes, a weak or failing battery can cause voltage fluctuations that trigger code P0603.
5. How can I fix code P0603 on my 2006 Infiniti G35?
Start by checking the battery condition, inspecting battery terminals and connectors for corrosion, and testing the ECM power relay. Repair or replace damaged wiring or components as needed.
6. Is it safe to drive with code P0603 on my 2006 Infiniti G35?
Driving with code P0603 may be possible, but it can lead to poor performance and potential engine stalling, so it’s best to address the issue promptly.
7. How do I know if the ECM itself is causing code P0603?
If the battery, wiring, and power relay are in good condition, the ECM may have an internal fault and require further testing or replacement.
8. Can resetting the ECM fix code P0603 on a 2006 Infiniti G35?
Resetting the ECM may clear the code temporarily, but if the underlying issue isn’t resolved, the code will likely return.
9. What tools are needed to diagnose code P0603 on a 2006 Infiniti G35?
A multimeter to check voltage and continuity, an OBDII scanner to read and clear codes, and possibly a battery tester are essential diagnostic tools.
10. How much does it cost to repair code P0603 on a 2006 Infiniti G35?
Repair costs vary depending on the issue. Replacing a battery or power relay may cost $100–$300, while ECM replacement can exceed $1,000.
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