P0603 Fault Code

Internal Control Module Keep Alive Memory (KAM) Error

• What does that mean?
• Symptoms
• Causes
• Solutions

The P0603 fault code indicates an Internal Control Module Keep Alive Memory (KAM) error. This error typically occurs when the engine control module (ECM) detects a discrepancy in the memory settings. KAM is used to store important settings and information required for the proper functioning of the vehicle's ECU. When there is an issue with this memory, it can lead to malfunctioning sensors and compromised performance.

What are the symptoms of the P0603 code?

Symptoms associated with the P0603 code may include:

• Illuminated check engine light
• Reduced engine performance
• Difficulty starting the vehicle
• Abnormal idling behavior
• Inconsistent fuel economy readings

What causes the P0603 code?

Possible causes of a P0603 error include:

• Faulty or failing ECM
• Corrupted data in the KAM
• Poor electrical connections or wiring harness issues
• Battery-related problems or power surges
• Software glitches in the engine control unit

How to fix P0603?

To resolve a P0603 code, consider the following steps:

• Check for other diagnostic trouble codes (DTCs) and address them first.
• Inspect the wiring harness and connectors related to the ECM for damage or corrosion.
• Perform a battery test and ensure the connections are secure and clean.
• Reprogram or update the ECM software if necessary.
• If the ECM is determined to be faulty, replacement may be required.