P0603 – Audi DTC

Audi DTC P0603 – Lack of proper voltage to the Keep Alive Memory connection on the PCM, Defective PCM Keep Alive Memory Module (KAM), Defective PCM ground circuit(s), Defective PCM controlled output devices

DTC P0603 meaning on Audi

DTC P0603 indicates a lack of proper voltage to the Keep Alive Memory (KAM) connection on the Powertrain Control Module (PCM). The KAM is essential for storing critical data such as fuel trim values, idle speed, and other parameters that help the engine run efficiently. When the PCM detects an issue with the KAM voltage, it triggers this diagnostic trouble code.

Audi DTC P0603 symptoms

Common symptoms associated with DTC P0603 may include:

• Check Engine Light illuminated
• Engine performance issues
• Inconsistent fuel economy
• Difficulty starting the engine
• Loss of stored settings (e.g., radio presets)

Audi DTC P0603 causes

Several factors can lead to the occurrence of DTC P0603, including:

• Lack of proper voltage to the KAM connection
• Defective PCM Keep Alive Memory Module
• Defective PCM ground circuit(s)
• Defective PCM controlled output devices

Audi DTC P0603 seriousness

DTC P0603 is considered a moderate issue. While it may not cause immediate catastrophic failure, it can lead to poor engine performance and drivability issues. Ignoring this code can result in further complications, including increased emissions and potential damage to the engine or transmission over time.

How to diagnose DTC P0603 on Audi

To diagnose DTC P0603, follow these steps:

1. Use an OBD-II scanner to confirm the presence of DTC P0603.
2. Inspect the KAM connection for any signs of damage or corrosion.
3. Check the voltage at the KAM connection with a multimeter.
4. Examine the PCM ground circuits for continuity and proper grounding.
5. Test the PCM Keep Alive Memory Module for functionality.
6. Inspect any PCM controlled output devices for faults.

How to fix DTC P0603 on Audi step-by-step instructions

To fix DTC P0603, follow these steps:

1. Repair or replace any damaged wiring or connectors related to the KAM.
2. Ensure the KAM connection is receiving the correct voltage.
3. Replace the defective PCM Keep Alive Memory Module if necessary.
4. Fix any issues found in the PCM ground circuit(s).
5. Replace any faulty PCM controlled output devices.
6. Clear the DTC using an OBD-II scanner and test drive the vehicle to ensure the code does not return.

How to erase DTC P0603 on Audi

To erase DTC P0603, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn the ignition key to the “On” position without starting the engine.
3. Navigate to the “Erase Codes” or “Clear DTCs” option on the scanner.
4. Confirm the action to erase the trouble codes.
5. Disconnect the scanner and start the engine to verify that the code does not reappear.

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