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AutoCodes – GMC – P0604 2016 GMC Sierra

P0604 2016 GMC Sierra Code - Control Module Random Access Memory Performance

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
P0604 2016 GMC Sierra indicates Control Module Random Access Memory Performance.
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.
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Code Popularity 176
How popular is this code, among other codes? Low
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Table of contents Created and updated by William Orellana on Mar 29, 2024
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Code P0604 2016 GMC Sierra 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 P0604 2016 GMC Sierra - Control Module Random Access Memory Performance - AutoCodes.com
P0604 2016 GMC Sierra Code - Control Module Random Access Memory Performance
What does this mean?

What are the Possible Causes of the DTC P0604 2016 GMC Sierra?

  • 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 P0604 2016 GMC Sierra?

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

Check the Powertrain Control Module (PCM) fuse, if the fuse is OK, then try erasing the code first and if the code comes back you may have to reprogram or replace the PCM.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0604 2016 GMC Sierra 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 P0604 2016 GMC Sierra code?

Need more information on how to fix the P0604 2016 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0604 2016 GMC Sierra 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 P0604 2016 GMC Sierra Code

What does the OBDII code P0604 mean on a 2016 GMC Sierra?

The P0604 code indicates an issue with the Control Module’s Random Access Memory (RAM) performance, suggesting a possible internal fault in the Engine Control Module (ECM).

What are the symptoms of the P0604 code in a 2016 GMC Sierra?

Common symptoms include the Check Engine Light turning on, poor engine performance, stalling, misfires, or difficulty starting the vehicle.

What causes the P0604 code to appear on a 2016 GMC Sierra?

Possible causes include a malfunctioning ECM, software corruption, electrical issues like damaged wiring or poor connections, or even low battery voltage.

Can a weak battery cause the P0604 code on a 2016 GMC Sierra?

Yes, a weak or failing battery can cause voltage irregularities, potentially triggering the P0604 code.

How do you diagnose the P0604 code on a 2016 GMC Sierra?

Diagnosis involves checking for other related codes, inspecting the battery and electrical connections, performing a load test on the battery, and testing the ECM for internal faults.

Can the P0604 code be cleared without repairs on a 2016 GMC Sierra?

While the code can sometimes be cleared temporarily, it is likely to return if the underlying issue isn’t resolved.

Is it safe to drive a 2016 GMC Sierra with the P0604 code?

Driving with this code is not recommended, as it may cause erratic engine behavior or other performance issues that could lead to unsafe driving conditions.

How much does it cost to fix the P0604 code on a 2016 GMC Sierra?

Repair costs vary depending on the issue, ranging from $100–$200 for minor electrical fixes to $500–$1,500 if the ECM needs replacement.

Can a software update fix the P0604 code on a 2016 GMC Sierra?

In some cases, reprogramming or updating the ECM software may resolve the issue if it is caused by software corruption.

Should the ECM always be replaced if the P0604 code is present?

No, the ECM should only be replaced after ruling out other potential causes, such as wiring issues, low battery voltage, or software problems.

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