P1605 – OBD-II DTC

OBD-II DTC P1605 – Loss of KAM Power: Open Circuit

DTC P1605 meaning

DTC P1605 refers to a diagnostic trouble code indicating a “Loss of KAM Power: Open Circuit.” KAM stands for Keep Alive Memory, which is essential for storing critical data such as fuel trim values, idle speed settings, and other parameters that help the engine control module (ECM) operate efficiently. When this code is triggered, it suggests that the ECM has lost power to its KAM circuit, which can affect the vehicle’s performance and drivability.

DTC P1605 symptoms

Common symptoms associated with DTC P1605 may include:

• Check Engine Light illuminated
• Loss of stored settings (e.g., radio presets, clock settings)
• Engine may run poorly or have erratic idle
• Increased fuel consumption
• Difficulty starting the engine

DTC P1605 causes

Several factors can lead to the triggering of DTC P1605, including:

• Faulty wiring or connectors in the KAM circuit
• Defective ECM
• Blown fuses related to the power supply of the ECM
• Corrosion or damage to the battery terminals
• Issues with the vehicle’s battery, such as low voltage or failure

DTC P1605 seriousness

The seriousness of DTC P1605 can vary depending on the underlying cause. While it may not immediately affect the vehicle’s ability to run, it can lead to poor performance and drivability issues over time. If left unaddressed, it may result in more significant problems, including engine stalling or failure to start. Therefore, it is advisable to diagnose and resolve this issue promptly.

How to diagnose DTC P1605

To diagnose DTC P1605, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the P1605 code.
2. Inspect the vehicle’s battery and connections for corrosion or damage.
3. Check the fuses related to the ECM and KAM circuit.
4. Examine the wiring and connectors for any signs of wear or open circuits.
5. Test the voltage at the KAM circuit to ensure it is within specifications.
6. If necessary, perform a continuity test on the KAM circuit wiring.
7. Consider testing or replacing the ECM if all other components are functioning correctly.

How to fix DTC P1605 step-by-step instructions

To fix DTC P1605, follow these step-by-step instructions:

1. Disconnect the vehicle’s battery to ensure safety while working on electrical components.
2. Inspect and clean the battery terminals to remove any corrosion.
3. Check and replace any blown fuses related to the ECM.
4. Examine the wiring and connectors for the KAM circuit, repairing or replacing any damaged components.
5. Reconnect the battery and ensure all connections are secure.
6. Use an OBD-II scanner to clear the DTC and check if it returns after a test drive.
7. If the code persists, consider testing or replacing the ECM as a last resort.

How to erase DTC P1605

To erase DTC P1605, follow these steps:

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

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