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P0603 2017 Chevrolet Silverado Code - Control Module Long Term Memory Reset

Quick Answer

The P0603 code for a 2017 Chevrolet Silverado indicates an issue with the Control Module Long Term Memory Reset. Common causes include Low battery voltage or a weak electrical system can cause the ECM to lose power, leading to a memory reset, Faulty wiring or connectors connecting the ECM to the vehicle's electrical system can disrupt communication and trigger a memory reset, A software glitch or malfunction in the ECM itself can cause the long-term memory to reset. 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 2017 Chevrolet Silverado indicates Control Module Long Term Memory Reset.
Common causes
Common causes include Low battery voltage or a weak electrical system can cause the ECM to lose power, leading to a memory reset, Faulty wiring or connectors connecting the ECM to the vehicle's electrical system can disrupt communication and trigger a memory reset, A software glitch or malfunction in the ECM itself can cause the long-term memory to reset.
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 10, 2024
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Code P0603 2017 Chevrolet Silverado Description

The P0603 code for a 2017 Chevrolet Silverado indicates an issue with the Control Module Long Term Memory Reset. This code is triggered when the vehicle's Engine Control Module (ECM) detects a loss of information or corruption in its long-term memory. The ECM is responsible for managing various engine functions, such as fuel injection, ignition timing, and emissions control. When the ECM's long-term memory is reset, it can lead to improper engine performance, decreased fuel efficiency, and potential safety hazards.

OBDII Code P0603 2017 Chevrolet Silverado - Control Module Long Term Memory Reset
P0603 2017 Chevrolet Silverado Code - Control Module Long Term Memory Reset

Common Causes of P0603 2017 Chevrolet Silverado

  1. Low battery voltage or a weak electrical system can cause the ECM to lose power, leading to a memory reset.
  2. Faulty wiring or connectors connecting the ECM to the vehicle's electrical system can disrupt communication and trigger a memory reset.
  3. A software glitch or malfunction in the ECM itself can cause the long-term memory to reset.
  4. Improper handling or installation of aftermarket performance parts or accessories can interfere with the ECM's operation and trigger a memory reset.

Symptoms of P0603 2017 Chevrolet Silverado

  1. Check engine light is illuminated on the dashboard.
  2. Rough idling or stalling when the vehicle is at a stop.
  3. Decreased fuel efficiency and increased emissions.
  4. Hesitation or lack of power during acceleration.
  5. Vehicle fails to pass emissions tests.

How to Fix P0603 2017 Chevrolet Silverado

  1. Perform a thorough inspection of the vehicle's electrical system to check for any loose connections or wiring issues.
  2. Test the battery and charging system to ensure they are functioning properly.
  3. Use a diagnostic scanner to reset the ECM and reprogram the long-term memory with the correct data.
  4. Update the ECM software to the latest version to address any known glitches or bugs that may be causing the issue.
  5. If necessary, replace the ECM with a new unit to resolve the problem.

Cost to Fix P0603 2017 Chevrolet Silverado

The cost of repairing a P0603 code on a 2017 Chevrolet Silverado can vary depending on the underlying cause of the issue. On average, the parts for this repair can range from $200 to $500, while labor costs can range from $100 to $200. However, it's essential to note that these are rough estimates, and the actual cost may be higher or lower based on the specific diagnosis and labor rates at auto repair shops. It's recommended to consult with a qualified mechanic or dealership for a more accurate cost estimate.

What does this mean?

Tech Notes for P0603 2017 Chevrolet Silverado

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).

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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 2017 Chevrolet Silverado Code

1. What does the OBDII code P0603 mean on a 2017 Chevrolet Silverado?

P0603 indicates an issue with the Control Module Long Term Memory Reset, meaning the ECM (Engine Control Module) has detected a problem with its internal memory or power supply.

2. What are the common symptoms of code P0603 in a 2017 Silverado?

Symptoms may include the check engine light turning on, intermittent stalling, poor engine performance, or loss of stored settings like idle calibration.

3. What causes the P0603 code in a Chevrolet Silverado?

This code is commonly caused by a weak or failing battery, corroded battery terminals, faulty ECM, loose wiring connections, or aftermarket performance tuners.

4. Can a low battery cause the P0603 code?

Yes, a weak or discharged battery can lead to insufficient power for the ECM, causing the P0603 code to appear.

5. How do I fix the P0603 code on my 2017 Silverado?

Start by checking the battery and charging system. Clean or replace corroded battery terminals, inspect wiring connections, and ensure the ECM has a stable power supply. If the issue persists, the ECM may need reprogramming or replacement.

6. Can an aftermarket tuner trigger the P0603 code?

Yes, aftermarket performance tuners or modifications can interfere with the ECM's memory and trigger the P0603 code.

7. Is it safe to drive with the P0603 code on my Silverado?

While the vehicle may still run, it could experience intermittent issues like stalling or performance problems. It’s best to address the issue promptly to avoid further complications.

8. How much does it cost to fix the P0603 code on a 2017 Chevrolet Silverado?

The cost varies depending on the root cause. Battery or wiring fixes may cost $50–$200, while ECM replacement or reprogramming can range from $300–$1,000.

9. Will disconnecting the battery clear the P0603 code?

Disconnecting the battery might temporarily clear the code, but it will return if the underlying issue is not resolved.

10. Can a faulty alternator cause the P0603 code?

Yes, a malfunctioning alternator can lead to inconsistent voltage levels, which may affect the ECM's memory and trigger the P0603 code.

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