AutoCodes – Volvo – P0603 Volvo

P0603 Volvo Code - Internal Control Module Keep Alive Memory Error

Quick Answer

This Diagnostic Trouble Code (DTC) is stored in the Engine Control Module (ECM) when a processing malfunction is detected. 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 Volvo indicates Internal Control Module Keep Alive Memory Error.
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.

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Code Popularity 1,861

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 Mar 17, 2021

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

This Diagnostic Trouble Code (DTC) is stored in the Engine Control Module (ECM) when a processing malfunction is detected. All power supplies and grounds should be tested before condemning a control module. Signals processed by the control module must be in digital form so analog signals must be converted for analysis. Before replacing the control module an investigation must take place to ensure the module is operating on the latest software. This fault code should only be addressed after any other component-related codes have been investigated.

OBDII Code P0603 Volvo - Internal Control Module Keep Alive Memory Error - AutoCodes.com — P0603 Volvo Code - Internal Control Module Keep Alive Memory Error

What does this mean?

What are the Possible Causes of the DTC P0603 Volvo?

Loose or poor battery terminal connection
Low battery charge
Faulty Engine Control Module (ECM)
Engine Control Module harness is open or shorted
Engine Control Module circuit poor electrical connection

How to Fix the DTC P0603 Volvo?

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 vehicle's battery and clean the terminal, once the battery is charged and the terminals are clean and secured, erase the code. If the code comes back ON, then you may have to reprogram or replace Engine Control Module (ECM).

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0603 Volvo 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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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 Volvo Code

1. What are common symptoms of OBDII code P0603 in a Volvo related to Internal Control Module Keep Alive Memory Error?

Symptoms may include the vehicle stalling, rough idling, poor fuel efficiency, and issues with starting the engine.

2. What are possible causes for the Internal Control Module Keep Alive Memory Error (P0603) in a Volvo?

Potential causes include a faulty powertrain control module (PCM), a defective wiring harness, or a weak vehicle battery.

3. How can I diagnose the Internal Control Module Keep Alive Memory Error in my Volvo?

Diagnosis typically involves using an OBDII scanner to retrieve the specific error code, checking the PCM connections, and testing the battery and charging system.

4. Can a DIY enthusiast repair OBDII code P0603 related to Internal Control Module Keep Alive Memory Error in a Volvo?

While some basic troubleshooting steps can be performed by DIYers, addressing this error code may require specialized tools and expertise. Consulting a professional mechanic is recommended.

5. Is it safe to continue driving my Volvo with OBDII code P0603, Internal Control Module Keep Alive Memory Error?

Continuing to drive with this error code may lead to further damage to the vehicle's engine control system. It's advisable to have the issue diagnosed and repaired promptly.

6. How much does it typically cost to repair OBDII code P0603 in a Volvo due to Internal Control Module Keep Alive Memory Error?

Costs can vary depending on the specific cause of the error, but repairs for this issue may range from a few hundred to over a thousand dollars, including parts and labor.

7. Can a low vehicle battery trigger the Internal Control Module Keep Alive Memory Error (P0603) in a Volvo?

Yes, a weak or failing vehicle battery can disrupt the PCM's keep-alive memory and trigger this error code. Ensuring the battery is in good condition is essential.

8. Are there any preventive maintenance tips to avoid OBDII code P0603 in a Volvo?

Regularly checking and maintaining the vehicle's battery, ensuring proper electrical system function, and promptly addressing any warning lights can help prevent this error code.

9. Can resetting the PCM clear the Internal Control Module Keep Alive Memory Error (P0603) in a Volvo?

Resetting the PCM may temporarily clear the error code, but if the underlying issue persists, the code is likely to reappear. It's crucial to diagnose and address the root cause.

10. How long does it typically take to repair OBDII code P0603 related to Internal Control Module Keep Alive Memory Error in a Volvo?

The repair time can vary depending on the specific cause and complexity of the issue. In some cases, it may be resolved within a few hours, while more intricate problems may take longer to diagnose and fix.