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P0605 Infiniti Code - Engine Control Module Fault

Quick Answer

The P0605 Infiniti code indicates a fault in the Engine Control Module (ECM), also known as the Powertrain Control Module (PCM) or Engine Control Unit (ECU). Common causes include ECM Hardware Failure: Internal components of the ECM can fail over time due to wear and tear, heat, or electrical issues, Software Glitches: Corrupted or outdated software within the ECM can cause malfunctions and trigger the P0605 code, Wiring Issues: Faulty wiring connections, shorts, or breaks can disrupt communication between the ECM and other components. 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 Infiniti indicates Engine Control Module Fault.
Common causes
Common causes include ECM Hardware Failure: Internal components of the ECM can fail over time due to wear and tear, heat, or electrical issues, Software Glitches: Corrupted or outdated software within the ECM can cause malfunctions and trigger the P0605 code, Wiring Issues: Faulty wiring connections, shorts, or breaks can disrupt communication between the ECM and other components.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 07, 2024
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Code P0605 Infiniti Description

The P0605 Infiniti code indicates a fault in the Engine Control Module (ECM), also known as the Powertrain Control Module (PCM) or Engine Control Unit (ECU). The ECM is a crucial component of the vehicle's onboard computer system that controls and manages various engine functions, such as fuel delivery, ignition timing, emissions, and more. When the ECM malfunctions, it can lead to significant issues with engine performance, fuel efficiency, and overall drivability.

OBDII Code P0605 Infiniti - Engine Control Module Fault
P0605 Infiniti Code - Engine Control Module Fault

Common Causes of P0605 Infiniti

  1. ECM Hardware Failure: Internal components of the ECM can fail over time due to wear and tear, heat, or electrical issues.
  2. Software Glitches: Corrupted or outdated software within the ECM can cause malfunctions and trigger the P0605 code.
  3. Wiring Issues: Faulty wiring connections, shorts, or breaks can disrupt communication between the ECM and other components.
  4. Power Surges: Sudden power surges or voltage spikes can damage the ECM and lead to a fault.
  5. Water Damage: Exposure to water or moisture can cause corrosion or short circuits within the ECM, resulting in a malfunction.

Symptoms of P0605 Infiniti

  1. Check Engine Light: The most common symptom associated with the P0605 code is the illumination of the check engine light on the dashboard.
  2. Engine Performance Issues: The vehicle may experience rough idling, stalling, hesitation, or poor acceleration due to the ECM fault.
  3. Decreased Fuel Efficiency: A malfunctioning ECM can impact fuel delivery and combustion, leading to decreased fuel efficiency.
  4. Starting Problems: In severe cases, the vehicle may have difficulty starting or may fail to start altogether.
  5. Erratic Behavior: The vehicle may exhibit erratic behavior or unexpected changes in engine performance.

How to Fix P0605 Infiniti

  1. Diagnose the Issue: Use a diagnostic scanner to retrieve the specific error codes and pinpoint the underlying cause of the ECM fault.
  2. Inspect Wiring: Check the wiring harness for any signs of damage, corrosion, or loose connections. Repair or replace any faulty wiring.
  3. Update Software: If the issue stems from software glitches, update the ECM software to the latest version provided by the manufacturer.
  4. Replace ECM: In cases of severe hardware failure, it may be necessary to replace the ECM with a new or refurbished unit.
  5. Clear Codes: After repairing the issue, clear the error codes from the ECM memory and reset the system to ensure the problem is resolved.

Cost to Fix P0605 Infiniti

The cost of repairing a P0605 Infiniti code can vary depending on the extent of the issue and the specific repairs needed. On average, the cost of replacing an ECM can range from $500 to $1500, including parts and labor. Additional costs may apply for diagnostic testing, wiring repairs, or software updates. It's important to consider that labor rates at auto repair shops can vary, with hourly rates typically ranging from $80 to $150. Prices may be higher at dealerships or in metropolitan areas, while independent shops may offer more competitive rates. To get an accurate estimate, it's recommended to contact local auto repair shops for quotes based on the specific make and model of the vehicle.

What does this mean?

Tech Notes for P0605 Infiniti

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

Need more information about the P0605 Infiniti code?

Need more information on how to fix the P0605 Infiniti code? Get Access to Factory Service Manuals

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Information for Specific Infiniti Models

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 Infiniti Code

1. What does the OBDII code P0605 mean for an Infiniti?

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

2. What are the common symptoms of a P0605 code in an Infiniti?

Symptoms may include poor engine performance, difficulty starting, stalling, reduced fuel efficiency, or the vehicle going into limp mode.

3. What causes the P0605 code to appear in an Infiniti?

The code can be caused by a faulty ECM, software corruption, electrical issues like a bad ground or wiring short, or damage from water or heat.

4. Can I drive my Infiniti with a P0605 code?

While the car may still run, driving with a P0605 code is not recommended as it can cause further damage to the engine or related systems.

5. How is the P0605 code diagnosed in an Infiniti?

A technician will use a scan tool to read the code, inspect the ECM for physical or electrical damage, and test the related circuits and connectors.

6. Does a P0605 code mean the ECM must be replaced?

Not always. Sometimes the issue can be resolved with reprogramming or repairing wiring, but if the ECM is irreparably damaged, replacement is necessary.

7. How much does it cost to fix a P0605 code in an Infiniti?

Repair costs can vary widely, from $100 for minor electrical repairs to $1,000 or more for ECM replacement and programming.

8. Can a P0605 code be triggered by a weak battery?

Yes, a weak or failing battery can cause voltage irregularities that might trigger the P0605 code.

9. What tools are needed to fix a P0605 code in an Infiniti?

Tools may include an OBDII scanner, multimeter, and sometimes a specialized ECM reprogramming tool if re-flashing is required.

10. How can I prevent the P0605 code from recurring in my Infiniti?

Maintain the vehicle's electrical system, avoid prolonged exposure to moisture near the ECM, and ensure any software updates are performed as recommended by the manufacturer.

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