P1446 – OBD-II DTC

OBD-II DTC P1446 – Evaporative Emission (EVAP) System Flow During Non-Purge Oldsmobile Only

DTC P1446 meaning

DTC P1446 refers to a specific diagnostic trouble code related to the Evaporative Emission (EVAP) system in Oldsmobile vehicles. This code indicates that there is a problem with the flow of fuel vapors during a non-purge condition. The EVAP system is designed to prevent fuel vapors from escaping into the atmosphere, and proper flow is essential for the system to function correctly.

DTC P1446 symptoms

Common symptoms associated with DTC P1446 may include:

• Check Engine Light illuminated
• Decreased fuel efficiency
• Rough idling or stalling
• Fuel odor near the vehicle

DTC P1446 causes

Several factors can lead to the triggering of DTC P1446, including:

• Faulty EVAP canister or vent valve
• Clogged or damaged EVAP hoses
• Defective fuel tank pressure sensor
• Improperly sealed fuel cap
• Electrical issues such as short circuits or open circuits in the EVAP system

DTC P1446 seriousness

DTC P1446 is considered a moderate issue. While it may not cause immediate engine failure, it can lead to increased emissions and reduced fuel efficiency. Ignoring this code may result in more significant problems in the EVAP system over time, potentially leading to costly repairs.

How to diagnose DTC P1446

To diagnose DTC P1446, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the P1446 code.
2. Inspect the fuel cap for proper sealing and condition.
3. Check for any visible damage or blockages in the EVAP hoses.
4. Test the EVAP canister and vent valve for proper operation.
5. Examine the fuel tank pressure sensor for functionality.
6. Perform a smoke test to identify any leaks in the EVAP system.

How to fix DTC P1446 step-by-step instructions

To fix DTC P1446, follow these step-by-step instructions:

1. Start by replacing the fuel cap if it is damaged or not sealing properly.
2. Repair or replace any damaged or clogged EVAP hoses.
3. Test and replace the EVAP canister or vent valve if they are found to be faulty.
4. Check and replace the fuel tank pressure sensor if it is not functioning correctly.
5. Clear any blockages in the EVAP system and ensure all components are connected properly.
6. After repairs, use an OBD-II scanner to clear the DTC and perform a drive cycle to verify the fix.

How to erase DTC P1446

To erase DTC P1446 from the vehicle’s computer, 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 engine to ensure the code does not return.

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