What Does P1444 Mean?
The diagnostic module tank leakage (DM-TL) pump control circuit has an open circuit condition. The leak detection pump cannot be activated to pressurize the EVAP system for leak testing.
Common Causes
40%
Open circuit in leak detection pump wiring or connectors
35%
Faulty leak detection pump motor or internal failure
15%
Blown fuse in leak detection pump circuit
8%
Corroded or damaged connector at leak detection pump
2%
PCM control circuit driver failure
Diagnostic Steps
1
Step 1: Locate the leak detection pump module (typically near fuel tank or EVAP canister) and inspect connector
2
Step 2: Check fuse for leak detection pump circuit and replace if blown
3
Step 3: Measure voltage at pump connector with key on (should have power on at least one terminal)
4
Step 4: Test pump ground circuit for continuity to chassis ground
5
Step 5: Apply direct battery power to pump to verify motor operation (should hear pump run)
Estimated Repair Cost
$150 - $500
Parts + labor, varies by vehicle and location
The diagnostic module tank leakage (DM-TL) pump control circuit has an open circuit condition. The leak detection pump cannot be activated to pressurize the EVAP system for leak testing.
The most common cause of P1444 (Diagnostic Module Tank Leakage (DM-TL) Pump Control Open Circuit) is: Open circuit in leak detection pump wiring or connectors
Typical repair costs for P1444 range from $150 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive but emissions testing will fail. EVAP system cannot perform self-diagnostics which may mask fuel system leaks causing vapor release.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1444 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Evaporative Emissions Leak Detection
Difficulty
Type
Manufacturer
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
