P0603 2012 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 2012 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 2012 Nissan Altima Sedan Description
What are the Possible Causes of the DTC P0603 2012 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- ECM Outdated Program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 2012 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 2012 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 2012 Nissan Altima Sedan Code
1. What does the OBDII code P0603 mean on a 2012 Nissan Altima Sedan?
P0603 indicates an issue with the Engine Control Module (ECM) power supply circuit, often related to an internal memory fault or power interruption.
2. What are the common symptoms of a P0603 code in a 2012 Nissan Altima?
Symptoms may include a check engine light, rough idling, decreased fuel efficiency, intermittent stalling, or difficulty starting the engine.
3. What causes the P0603 code to appear in a Nissan Altima?
Common causes include a weak or faulty battery, corroded or loose battery terminals, a failing ECM, or power supply issues like damaged wiring or connectors.
4. Can a weak battery cause the P0603 code?
Yes, a weak or failing battery can cause voltage drops that may trigger the P0603 code due to ECM memory resetting or power interruptions.
5. How do you diagnose the P0603 code in a 2012 Nissan Altima?
Diagnosing involves checking the battery and alternator, inspecting wiring and connectors to the ECM, and performing a voltage test on the ECM power supply circuit.
6. Is the ECM always the problem when a P0603 code is present?
No, the ECM is not always at fault. The issue could stem from the battery, wiring, or power supply components, so thorough diagnostics are essential before replacing the ECM.
7. Can I drive my 2012 Nissan Altima with a P0603 code?
While the car might still be drivable, it’s not advisable as the issue can cause performance problems and lead to further damage if not addressed.
8. How do you fix the P0603 code in a Nissan Altima?
Repairs may include replacing a weak battery, cleaning or tightening battery terminals, repairing damaged wiring, or replacing the ECM if it’s determined to be faulty.
9. Does clearing the P0603 code solve the problem?
Clearing the code may temporarily turn off the check engine light, but it won’t fix the underlying issue causing the code to appear.
10. How much does it cost to repair a P0603 code on a 2012 Nissan Altima?
Costs vary depending on the cause. Battery replacement typically costs $100–$200, while ECM replacement can range from $500 to $1,500, including programming.
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