What are the symptoms of P0603?

Symptoms of P0603 include: Check engine light, Poor performance, Rough idle, Transmission issues, Reset vehicle settings.

To fix P0603, you can try: Check battery voltage and connections ($50-$150, beginner); Replace battery ($100-$300, beginner); Reprogram ECM ($150-$400, professional). Based on 0 owner reports.

P0603Medium Priority

Internal Control Module Keep Alive Memory (KAM) Error

Category: Powertrain• Computer and Auxiliary Outputs

Based on 47 owner reports

What is P0603?

Internal Control Module Keep Alive Memory (KAM) Error. The ECM has lost its keep-alive memory, erasing learned parameters.

Symptoms You May Notice

●Check engine light
●Poor performance
●Rough idle
●Transmission issues
●Reset vehicle settings

How to Fix It

●Check battery voltage and connections ($50-$150, beginner)
●Replace battery ($100-$300, beginner)
●Reprogram ECM ($150-$400, professional)
●Replace ECM ($500-$1500, professional)

Issues by Vehicle

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Reference Information Only

This is a general OBD-II code reference. We're actively collecting real owner experiences and repair data for this code. Check back soon for vehicle-specific troubleshooting guides.