What Does P1473 Mean?
The Diagnostic Module Tank Leakage (DM-TL) pump current is outside expected parameters. The pump is drawing too much or too little current, indicating mechanical or electrical failure of the leak detection system.
Common Causes
35%
Failed or worn DM-TL pump motor
25%
Blocked or restricted pump filter or air passages
20%
Mechanical binding or seized pump impeller
12%
Low voltage supply to pump causing high current draw
8%
Failed DM-TL control module or internal electronics
Diagnostic Steps
1
Step 1: Measure actual current draw of DM-TL pump during operation using ammeter
2
Step 2: Inspect and clean pump filter and air passages for restrictions or debris
3
Step 3: Check battery voltage and voltage at pump during operation (should be 12-14V)
4
Step 4: Disconnect pump hoses and manually check for proper airflow when pump operates
5
Step 5: Replace DM-TL pump if current draw is out of specification or mechanical issues found
Estimated Repair Cost
$200 - $600
Parts + labor, varies by vehicle and location
The Diagnostic Module Tank Leakage (DM-TL) pump current is outside expected parameters. The pump is drawing too much or too little current, indicating mechanical or electrical failure of the leak detection system.
The most common cause of P1473 (Diagnostic Module Tank leakage (DM-TL) Pump Current Plausibility) is: Failed or worn DM-TL pump motor
Typical repair costs for P1473 range from $200 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to operate vehicle. EVAP system leak detection will be disabled, causing emissions test failure but no safety or drivability concerns.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1473 to identify the root cause.
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Quick Info
Category
Powertrain
System
Evaporative Emissions System
Difficulty
Type
Manufacturer
Recommended Tools
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