AutoCodes – Chevrolet – P0603 Chevrolet

P0603 Chevrolet Code - Control Module Long Term Memory Reset

Quick Answer

This diagnostic applies to internal microprocessor integrity conditions within the Engine Control Module (ECM). Common causes include Low battery voltage, Reprogram Engine Control Module (ECM), Faulty Engine Control Module. 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 Chevrolet indicates Control Module Long Term Memory Reset.
Common causes: Common causes include Low battery voltage, Reprogram Engine Control Module (ECM), Faulty Engine Control Module.
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.

Save to My Repairs Step-by-Step Diagnostic Guide My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 8,690

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 29, 2024

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P0603 Chevrolet Description

This diagnostic applies to internal microprocessor integrity conditions within the Engine Control Module (ECM). This diagnostic also addresses if the ECM is not programmed. The ECM monitors its ability to read and write to the memory. It also monitors a timing function. No external circuits are involved. The Diagnostic Trouble Code (DTC) will be set when the ECM detects an internal failure or incomplete programming for more than 10 s.

OBDII Code P0603 Chevrolet - Control Module Long Term Memory Reset - AutoCodes.com — P0603 Chevrolet Code - Control Module Long Term Memory Reset

What does this mean?

What are the Possible Causes of the DTC P0603 Chevrolet?

Low battery voltage
Reprogram Engine Control Module (ECM)
Faulty Engine Control Module
Engine Control Module harness is open or shorted
Engine Control Module circuit poor electrical connection

How to Fix the DTC P0603 Chevrolet?

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 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 Powertrain Control Module (PCM).

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0603 Chevrolet 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 Chevrolet code?

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

Need Help with the Code?

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

Information for Specific Chevrolet Models

P0603 2014 Chevrolet Silverado — Control Module Long Term Memory Reset
P0603 2015 Chevrolet Silverado — Control Module Long Term Memory Reset
P0603 2016 Chevrolet Silverado — Control Module Long Term Memory Reset
P0603 2017 Chevrolet Silverado — Control Module Long Term Memory Reset
P0603 2018 Chevrolet Silverado — Control Module Long Term Memory Reset

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 Chevrolet Code

1. What does the OBDII code P0603 for Chevrolet indicate?

The P0603 code refers to the Control Module Long Term Memory Reset in a Chevrolet vehicle. It means that the vehicle's Engine Control Module (ECM) has detected a loss of memory or a fault in the module's memory.

2. What are the common symptoms of a P0603 code in a Chevrolet?

Common symptoms of a P0603 code in a Chevrolet may include engine stalling, rough idling, poor fuel efficiency, and issues with acceleration or overall engine performance.

3. What can cause the P0603 code to trigger in a Chevrolet?

The P0603 code in a Chevrolet can be triggered by a variety of factors, including a weak or dead battery, faulty ECM connections, a damaged ECM, or issues with the vehicle's electrical system.

4. How can I diagnose a P0603 code in my Chevrolet?

Diagnosing a P0603 code in your Chevrolet typically involves using an OBDII scanner to retrieve the specific code, checking for any other related codes, inspecting the ECM connections, and testing the vehicle's battery and electrical system.

5. Can I drive my Chevrolet with a P0603 code?

It is not recommended to drive your Chevrolet with a P0603 code present, as it can lead to further damage to the vehicle's engine or electrical system. It's best to address the issue promptly.

6. How can I repair a P0603 code in my Chevrolet?

Repairing a P0603 code in a Chevrolet may involve resetting the ECM, checking and repairing any faulty connections, replacing the ECM if necessary, and ensuring the vehicle's battery and electrical system are in good condition.

7. Will a P0603 code cause my Chevrolet to fail an emissions test?

Yes, a P0603 code in your Chevrolet can cause the vehicle to fail an emissions test, as it indicates a fault in the engine control module that can affect the vehicle's emissions and overall performance.

8. How much does it typically cost to repair a P0603 code in a Chevrolet?

The cost of repairing a P0603 code in a Chevrolet can vary depending on the specific issue causing the code, the extent of the repairs needed, and the labor rates of the repair shop. It's best to consult with a mechanic for an accurate estimate.

9. Can I clear a P0603 code in my Chevrolet with an OBDII scanner?

While you can clear a P0603 code with an OBDII scanner, it's important to address the underlying issue causing the code to prevent it from reoccurring. Simply clearing the code without addressing the root cause may lead to further problems.

10. How can I prevent a P0603 code from appearing in my Chevrolet?

To prevent a P0603 code in your Chevrolet, it's important to maintain regular vehicle maintenance, ensure the battery is in good condition, check and clean ECM connections periodically, and address any electrical issues promptly.