DTC P0604 Internal Control Module Random Access Memory (RAM) Error

DTC P0604 points to an Internal Control Module Random Access Memory (RAM) Error. Understanding the significance, potential causes, observable symptoms, diagnostic procedures, and corrective measures associated with this code is crucial in addressing and resolving this issue effectively.

1. What Does P0604 Code Mean?

P0604 indicates an error concerning the vehicle’s internal control module’s Random Access Memory (RAM). This error arises when the module encounters issues in properly storing or accessing data within its RAM.

2. What Are the Causes of DTC P0604?

Several factors might trigger DTC P0604:

  • Faulty RAM: Problems with the control module’s RAM, such as damage or malfunction, could lead to error codes.
  • Electrical Issues: Disruptions in the vehicle’s electrical system or power supply affecting the module’s RAM functionality.
  • Software or Firmware Errors: Glitches in the control module’s software or firmware could cause RAM-related errors.

3. What Are the Symptoms of DTC P0604?

Observable symptoms related to DTC P0604 may include:

  • Check Engine Light: Illumination of the check engine light or other warning indicators due to RAM-related errors.
  • Performance Irregularities: Potential disruptions or irregularities in the vehicle’s performance due to issues with the control module’s RAM.

4. How to Diagnose DTC P0604?

Accurate diagnosis is crucial to identify the root cause:

  • OBD-II Scanner: Use a scanner to retrieve the trouble code and any associated codes for comprehensive analysis.
  • RAM Inspection: Inspect the control module’s RAM for any signs of damage or malfunctions.
  • Software/Firmware Evaluation: Assess the control module’s software or firmware for any glitches or errors impacting RAM functionality.

5. How to Fix DTC P0604 Problem?

Addressing DTC P0604 involves specific steps:

  • Control Module Assessment: Evaluate the control module’s RAM for potential damage and consider replacing the module if necessary.
  • Software/Firmware Update: Updating the control module’s software or firmware to rectify any glitches causing RAM errors.
  • Electrical System Check: Inspect the vehicle’s electrical system to ensure stable power supply and rectify any disruptions impacting the control module’s RAM.


DTC P0604, an Internal Control Module Random Access Memory (RAM) Error, signifies issues within the control module’s RAM, affecting its data storage and access capabilities. Understanding the code’s implications, potential triggers, observable symptoms, systematic diagnostic procedures, and effective resolution methods is essential in successfully addressing and rectifying this issue. Fixing DTC P0604 ensures optimal RAM functionality within the control module, contributing to the vehicle’s proper performance and functionality.