P0603 Code – Internal Control Module KAM Error | Causes & Fixes | NayaPurana

DTC Code P0603 points to a failure in the ECM's Keep Alive Memory (KAM). This blog explains its symptoms, causes, and solutions. Find affordable replacement ECUs at NayaPurana.

🚗 What is DTC Code P0603?

DTC P0603 indicates an issue with the Keep Alive Memory (KAM) inside the vehicle’s Engine Control Module (ECM). The KAM stores critical adaptive data for smooth engine performance even when the ignition is off. A failure means the ECM may not retain crucial information, affecting drivability.

🔍 Common Symptoms of P0603 Code

• Check Engine Light (CEL) stays on

• Rough engine idle or hesitation

• Poor fuel economy

• Difficulty starting

• Transmission shifting issues

• Loss of adaptive learning functions

⚠️ Possible Causes of P0603

• Weak or dead car battery

• Damaged ECM power supply or ground circuit

• Corrupted ECM firmware or software

• Faulty Keep Alive Memory chip

• Electrical interference or poor wiring

• Recent tuning or ECU programming

🛠️ How to Fix the P0603 Code

1. Check Battery Health: Replace if weak or unstable.

2. Inspect Ground & Power Wires: Look for loose or corroded connections.

3. Clear the Code: Use an OBD-II scanner to reset the code and observe.

4. Reprogram ECM: If software glitch suspected, reflash or update ECM firmware.

5. Replace ECM: If the internal memory fails, replacing the ECU may be required.

💡Tip: Always disconnect the battery before working on the ECU or wiring.

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Find used and refurbished ECUs at a fraction of the price only on NayaPurana. Whether you're repairing a P0603 issue or upgrading, we’ve got the tested modules for your car brand.

🔗 Internal Links:

• Used Car ECUs – All Brands

• Symptoms of a Bad Engine Control Module

• Buy Spare Parts Online