• Check Engine Light is on
• Failed emissions test
• Possible fuel odor
• Faulty DM TL pump
• Open or shorted wiring in the DM TL pump circuit
• Faulty ECM
DM TL: Diagnostic Module Tank Leakage
ECM: Engine Control Module
• P1445
• P1446
Diagnostic Module Tank Leakage (DM TL) Pump Control Circuit/Open
This code means that there's a problem with the car's system that checks for leaks in the gas tank. It's like when you have a balloon and you're trying to see if it has any holes, but the pump you use to check is not working right.
The P1444 code indicates an issue with the circuit that controls the pump used to test for leaks in the fuel tank system. This pump is part of the evaporative emission control system.
The Diagnostic Module Tank Leakage (DM TL) is a component of the evaporative emission control system that uses a pump to pressurize the fuel tank and detect leaks. The P1444 code is triggered when the engine control module (ECM) detects an open circuit or a malfunction in the DM TL pump control circuit.
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for the DM TL pump.
• Test the DM TL pump for proper operation.
• Repair or replace damaged wiring or connectors.
• Replace the DM TL pump if it is faulty.
• Reprogram or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $400
Moderate
• BMW 3 Series
• BMW 5 Series
• Mini Cooper
• Regularly inspect the fuel system components.
• Ensure all connectors are secure.
• Perform routine vehicle maintenance.
Sensor Issue
• Do not ignore the Check Engine Light.
• Have the vehicle inspected by a professional if unsure.
• Monitor for any unusual fuel odors.
Check with your vehicle manufacturer for warranty coverage on emission-related components.
The P1444 code has been commonly associated with BMW and Mini vehicles due to their specific emission control system designs.
Moderate – It should be addressed to prevent potential emission test failures and to ensure the vehicle runs efficiently.
Driving with a Check Engine Light on may result in a failed emissions test. It's important to address emission-related issues promptly.
• Vehicle must be at operating temperature.
• Ensure the fuel tank is not overfilled.
The DM TL pump is typically located near the fuel tank or integrated within the evaporative emission control system components.
Q: Can I drive with a P1444 code?
A: While the car may still be drivable, it's best to address the issue to avoid potential emissions test failures and ensure proper vehicle operation.
Q: How do I know if the DM TL pump is faulty?
A: A professional diagnostic test using an OBD-II scanner and multimeter can determine if the pump is malfunctioning.
