AutoCodes – Nissan – P0605 2011 Nissan Altima Sedan

P0605 2011 Nissan Altima Sedan Code - Engine Control Module Fault

Quick Answer

The Engine Control Module (ECM) continuously monitors its own internal memory status, internal circuits, and output signals transmitted to the throttle actuator. Common causes include Engine Control Module (ECM) may be faulty, ECM harness power supply circuit is open or shorted, ECM harness ground 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: P0605 2011 Nissan Altima Sedan indicates Engine Control Module Fault.
Common causes: Common causes include Engine Control Module (ECM) may be faulty, ECM harness power supply circuit is open or shorted, ECM harness ground 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.

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Code Popularity 3,784

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0605 2011 Nissan Altima Sedan Description

The Engine Control Module (ECM) continuously monitors its own internal memory status, internal circuits, and output signals transmitted to the throttle actuator. This self-check insures that the ECM is functioning properly. If any malfunction is detected, the ECM sets the P0605 code and illuminates the MIL.

OBDII Code P0605 2011 Nissan Altima Sedan - Engine Control Module Fault - AutoCodes.com — P0605 2011 Nissan Altima Sedan Code - Engine Control Module Fault

What does this mean?

What are the Possible Causes of the DTC P0605 2011 Nissan Altima Sedan?

Engine Control Module (ECM) may be faulty
ECM harness power supply circuit is open or shorted
ECM harness ground circuit is open or shorted

How to Fix the DTC P0605 2011 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.

What does this mean?

Code Tech Notes

Try erasing the code first, if the light comes back ON you may have to replace the ECM to repair the problem.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0605 2011 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.

Need more information about the P0605 2011 Nissan Altima Sedan code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0605 2011 Nissan Altima Sedan Code

1. What does the OBDII code P0605 mean on a 2011 Nissan Altima Sedan?

P0605 indicates an internal fault in the Engine Control Module (ECM), specifically related to the ECM's ROM (Read-Only Memory).

2. What are the common symptoms of the P0605 code in a 2011 Nissan Altima?

Symptoms may include the Check Engine Light turning on, reduced engine performance, stalling, rough idling, or the vehicle failing to start.

3. What causes the P0605 code to appear in a 2011 Nissan Altima?

Common causes include a malfunctioning ECM, corrupted software, electrical issues such as wiring or connector problems, or, in rare cases, a programming error.

4. Can I drive my 2011 Nissan Altima with a P0605 code?

Driving with a P0605 code is not recommended, as it can lead to unpredictable engine behavior, including stalling or loss of power, which could create safety risks.

5. How do you diagnose the P0605 code in a 2011 Nissan Altima?

A mechanic will use an OBDII scanner to confirm the code, inspect the ECM for damage, check wiring and connectors for faults, and potentially test or reprogram the ECM.

6. How is the P0605 code repaired in a 2011 Nissan Altima?

Repairs may include reprogramming or updating the ECM software, repairing or replacing damaged wiring or connectors, or replacing the ECM if it is defective.

7. How much does it cost to fix a P0605 code on a 2011 Nissan Altima?

Repair costs can vary, but ECM replacement typically ranges from $500 to $1,200, depending on parts and labor. Diagnosing and fixing wiring issues may be less expensive.

8. Can a weak battery cause the P0605 code in a 2011 Nissan Altima?

Yes, a weak or failing battery can sometimes trigger the P0605 code due to insufficient voltage reaching the ECM, which may cause it to malfunction.

9. Is reprogramming the ECM always necessary for a P0605 code?

Not always. Reprogramming is necessary if the issue is related to corrupted software, but hardware faults or wiring problems may not require reprogramming.

10. What should I do if the P0605 code reappears after repairs?

If the code returns, recheck all wiring and connections, ensure the ECM software is updated, and consult a professional to verify the integrity of the replacement ECM.