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P0605 Mitsubishi Code - Internal Control Module ROM

Quick Answer

The P0605 diagnostic trouble code (DTC) for Mitsubishi vehicles refers to an issue with the Internal Control Module ROM (Read Only Memory). Common causes include Corrupted or damaged data on the Internal Control Module ROM, Electrical issues, such as faulty wiring or connections, Problems with the 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
P0605 Mitsubishi indicates Internal Control Module ROM.
Common causes
Common causes include Corrupted or damaged data on the Internal Control Module ROM, Electrical issues, such as faulty wiring or connections, Problems with the 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.
What is this?
Table of contents Created and updated by William Orellana on Sep 12, 2024
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Code P0605 Mitsubishi Description

The P0605 diagnostic trouble code (DTC) for Mitsubishi vehicles refers to an issue with the Internal Control Module ROM (Read Only Memory). The ROM is a type of memory chip that stores data permanently and is used by the Engine Control Module (ECM) to perform various functions related to engine performance, emissions control, and overall vehicle operation. When the ECM detects a problem with the ROM, it triggers the P0605 code, indicating a potential issue that needs to be addressed.

OBDII Code P0605 Mitsubishi - Internal Control Module ROM
P0605 Mitsubishi Code - Internal Control Module ROM

Common Causes of P0605 Mitsubishi

  1. Corrupted or damaged data on the Internal Control Module ROM
  2. Electrical issues, such as faulty wiring or connections
  3. Problems with the Engine Control Module (ECM)
  4. Issues with the vehicle's battery or charging system
  5. Environmental factors, such as extreme temperatures or moisture exposure

Symptoms of P0605 Mitsubishi

  1. Rough idling or erratic engine behavior
  2. Stalling or difficulty starting the engine
  3. Decreased fuel efficiency
  4. Check Engine Light illuminated
  5. Loss of power or acceleration

How to Fix P0605 Mitsubishi

  1. Retrieve and record any additional DTCs present in the vehicle's ECM.
  2. Inspect the wiring and connections related to the Internal Control Module ROM for any signs of damage or corrosion.
  3. Perform a thorough inspection of the ECM to determine if it needs to be replaced or reprogrammed.
  4. If necessary, replace the Internal Control Module ROM with a new one and reprogram it to ensure compatibility with the vehicle.
  5. Clear the DTCs from the ECM's memory and perform a test drive to verify that the issue has been resolved.

Cost to Fix P0605 Mitsubishi

The cost of repairing a P0605 code for a Mitsubishi vehicle can vary depending on the specific model, year, and any additional parts or labor needed. In general, the cost of replacing the Internal Control Module ROM and reprogramming the ECM can range from $200 to $500. However, it's essential to note that diagnosis time and labor rates at auto repair shops can vary significantly, with hourly rates typically falling between $80 and $150. Rates may be higher at dealerships or in metropolitan areas, while independent shops may offer lower prices. It's advisable to consult with a trusted mechanic or repair shop to obtain a more precise estimate for this repair.

What does this mean?

Tech Notes for P0605 Mitsubishi

Check the ECM fuse, if fuse is OK try erasing the code first and if the code comes back you may have to reprogram or replaced the ECM.

When is the Code Detected?

Indicates the ECM has experienced an internal memory fault.

Need more information about the P0605 Mitsubishi 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 Mitsubishi Code

1. What does OBDII code P0605 for Mitsubishi indicate?

- OBDII code P0605 indicates a malfunction in the Internal Control Module ROM.

2. What are the common symptoms associated with OBDII code P0605 in a Mitsubishi vehicle?

- Common symptoms include engine stalling, rough idling, poor acceleration, and the illumination of the Check Engine Light.

3. What are the possible causes of OBDII code P0605 in a Mitsubishi vehicle?

- Possible causes include a faulty internal control module, damaged control module software, wiring issues, or a weak battery.

4. How can I diagnose OBDII code P0605 in my Mitsubishi vehicle?

- Diagnosing OBDII code P0605 typically involves using an OBDII scanner to retrieve the code, checking for other related codes, and inspecting the control module and its connections.

5. Can OBDII code P0605 be cleared/reset, or does it require immediate repair?

- OBDII code P0605 can be cleared/reset, but it is recommended to diagnose and repair the underlying issue to prevent further problems.

6. What are some repair tips for addressing OBDII code P0605 in a Mitsubishi vehicle?

- Repair tips include checking the control module connections, ensuring the battery is in good condition, and reprogramming or replacing the control module if necessary.

7. Is it safe to continue driving with OBDII code P0605 present in a Mitsubishi vehicle?

- It is not recommended to drive with OBDII code P0605 present, as it can lead to further engine performance issues and potential safety concerns.

8. How much does it typically cost to repair OBDII code P0605 in a Mitsubishi vehicle?

- The cost of repairing OBDII code P0605 can vary depending on the specific cause and the labor rates of the repair shop, but it may range from $200 to $800.

9. Can I attempt to fix OBDII code P0605 on my own, or should I seek professional help?

- While some simple checks like inspecting connections can be done by DIY enthusiasts, diagnosing and repairing OBDII code P0605 often requires professional expertise due to the complexity of the control module.

10. How can I prevent OBDII code P0605 from occurring in my Mitsubishi vehicle in the future?

- To prevent OBDII code P0605, it is essential to maintain a healthy battery, avoid electrical system issues, and regularly check for any signs of engine performance problems.

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