AutoCodes – MINI – P0603 MINI

P0603 MINI Code - ECM Self Check Fault

Quick Answer

Battery voltage is supplied to the 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, ECM power supply 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: P0603 MINI indicates ECM Self Check Fault.
Common causes: Common causes include Loose or poor battery terminal connection, Low battery charge, ECM power supply 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 1,766

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
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0603 MINI Description

OBDII Code P0603 MINI - ECM Self Check Fault - AutoCodes.com — P0603 MINI Code - ECM Self Check Fault

What does this mean?

What are the Possible Causes of the DTC P0603 MINI?

Loose or poor battery terminal connection
Low battery charge
ECM power supply circuit is open or shorted
ECM Programing
Faulty ECM

How to Fix the DTC P0603 MINI?

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

Start by charging the vehicles battery and clean terminal, once the battery is charged and the terminals are clean and secure, erase code. If the code comes back ON you may have to reprogram or replaced ECM

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0603 MINI 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 P0603 MINI code?

Need more information on how to fix the P0603 MINI code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0603 MINI code diagnosed by a professional: Find a repair shop in your area

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 P0603 MINI Code

1. What is the meaning of OBDII code P0603 in a MINI, and what does it indicate?

- OBDII code P0603 in a MINI refers to an ECM Self Check Fault, indicating a potential issue with the Engine Control Module (ECM).

2. What are the common symptoms associated with OBDII code P0603 in a MINI?

- Common symptoms of code P0603 in a MINI may include engine performance issues, stalling, rough idling, or the Check Engine light coming on.

3. What are the possible causes of OBDII code P0603 in a MINI?

- The potential causes of code P0603 in a MINI can include a faulty ECM, damaged wiring or connectors, software issues, or electrical problems.

4. How can I diagnose OBDII code P0603 in a MINI?

- Diagnosing code P0603 in a MINI typically involves using an OBDII scanner to retrieve the code, checking for related symptoms, inspecting wiring and connectors, and testing the ECM.

5. What are some repair tips for resolving OBDII code P0603 in a MINI?

- Repair tips for addressing code P0603 in a MINI may include resetting the ECM, repairing or replacing damaged wiring, ensuring proper software updates, or replacing the ECM if necessary.

6. Can I continue driving my MINI with OBDII code P0603 present?

- It is not recommended to continue driving your MINI with code P0603 present, as it can lead to further engine performance issues or potential damage.

7. How much does it typically cost to repair OBDII code P0603 in a MINI?

- The cost to repair code P0603 in a MINI can vary depending on the underlying cause, but it may range from a few hundred dollars for minor repairs to over a thousand dollars for ECM replacement.

8. Is it possible to reset OBDII code P0603 in a MINI without professional help?

- While you can attempt to reset the code yourself using an OBDII scanner, it is recommended to have a professional diagnose and repair the underlying cause to prevent future issues.

9. Will OBDII code P0603 in a MINI cause permanent damage if left untreated?

- Ignoring OBDII code P0603 in a MINI can potentially lead to more severe engine problems or permanent damage if the underlying issue is not addressed promptly.

10. How long does it typically take to repair OBDII code P0603 in a MINI?

- The repair time for code P0603 in a MINI can vary based on the diagnosis and required repairs, but it may take a few hours to a day for a mechanic to resolve the issue.