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Engine-Codes – BMW – P1446 BMW

P1446 BMW Code - Diagnostic Module Tank Leakage Pump Control Circuit Signal High

Quick Answer

The P1446 BMW code indicates a fault in the Diagnostic Module Tank Leakage Pump Control Circuit, specifically signaling a high voltage. Common causes include Faulty Tank Leakage Pump: The pump responsible for controlling fuel vapor leakage may be malfunctioning, Wiring Issues: Damaged or corroded wiring in the circuit can disrupt the signal and trigger the code, Faulty Sensor: A malfunctioning sensor in the system may be inaccurately detecting fuel vapor levels. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P1446 BMW indicates Diagnostic Module Tank Leakage Pump Control Circuit Signal High.
Common causes
Common causes include Faulty Tank Leakage Pump: The pump responsible for controlling fuel vapor leakage may be malfunctioning, Wiring Issues: Damaged or corroded wiring in the circuit can disrupt the signal and trigger the code, Faulty Sensor: A malfunctioning sensor in the system may be inaccurately detecting fuel vapor levels.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 06, 2024
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Code P1446 BMW Description

The P1446 BMW code indicates a fault in the Diagnostic Module Tank Leakage Pump Control Circuit, specifically signaling a high voltage. This system is responsible for monitoring and controlling the fuel vapor emissions from the fuel tank, ensuring that no harmful gases escape into the atmosphere. When this circuit malfunctions, it can lead to increased emissions, reduced fuel efficiency, and potential environmental hazards.

OBDII Code P1446 BMW - Diagnostic Module Tank Leakage Pump Control Circuit Signal High
P1446 BMW Code - Diagnostic Module Tank Leakage Pump Control Circuit Signal High

Common Causes of P1446 BMW

  1. Faulty Tank Leakage Pump: The pump responsible for controlling fuel vapor leakage may be malfunctioning.
  2. Wiring Issues: Damaged or corroded wiring in the circuit can disrupt the signal and trigger the code.
  3. Faulty Sensor: A malfunctioning sensor in the system may be inaccurately detecting fuel vapor levels.
  4. Vacuum Leaks: Any leaks in the vacuum system can affect the fuel vapor management and trigger the code.
  5. ECM/PCM Malfunction: A problem with the engine control module or powertrain control module could also be a potential cause.

Symptoms of P1446 BMW

  1. Check Engine Light: The most obvious symptom is the illumination of the Check Engine Light on the dashboard.
  2. Strong Fuel Odor: A noticeable smell of fuel around the vehicle, especially when parked or after refueling.
  3. Decreased Fuel Efficiency: The vehicle may experience lower fuel efficiency due to improper fuel vapor management.
  4. Rough Idle: The engine may run rough or have difficulty maintaining a steady idle speed.
  5. Failed Emissions Test: If the issue is not resolved, the vehicle may fail emissions tests due to increased emissions.

How to Fix P1446 BMW

  1. Diagnose the Issue: Use a scan tool to read the code and pinpoint the exact cause of the problem.
  2. Inspect Wiring and Connections: Check all wiring and connections related to the Tank Leakage Pump Control Circuit for any damage or corrosion.
  3. Test Tank Leakage Pump: Verify the functionality of the tank leakage pump to ensure it is working properly.
  4. Replace Faulty Components: Replace any faulty sensors, pumps, or wiring harnesses as needed to resolve the issue.
  5. Clear Codes and Test Drive: After making the necessary repairs, clear the diagnostic trouble codes and test drive the vehicle to ensure the problem has been resolved.

Cost to Fix P1446 BMW

The cost of repairing a P1446 BMW code can vary depending on the specific cause of the issue and the labor rates in your area. On average, you can expect to pay anywhere from $200 to $500 for parts and labor to address this problem. Keep in mind that diagnostic time and labor rates can vary, so it's recommended to get a few quotes from local auto repair shops for a more accurate estimate.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

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