What Does P2404 Mean?
The leak detection pump sense circuit signal is outside expected range or showing erratic behavior during pump operation. The PCM cannot properly monitor pump performance or pressure readings.
Common Causes
35%
Failing leak detection pump with erratic pressure sensor or switch
25%
Intermittent wiring fault or poor connection in sense circuit
20%
Clogged EVAP system lines or restricted filter affecting pump readings
12%
Faulty voltage reference or ground circuit to pump
8%
PCM issue with sense circuit processing
Diagnostic Steps
1
Step 1: Monitor leak detection pump sense circuit signal with scan tool while commanding pump operation
2
Step 2: Check EVAP system for restrictions by inspecting canister, lines, and filters for clogs or damage
3
Step 3: Verify proper voltage reference (5V) and ground at pump connector
4
Step 4: Test sense circuit wiring for intermittent faults by wiggling harness while monitoring signal
5
Step 5: Compare pump pressure readings to specifications during active test with scan tool
Estimated Repair Cost
$200 - $700
Parts + labor, varies by vehicle and location
The leak detection pump sense circuit signal is outside expected range or showing erratic behavior during pump operation. The PCM cannot properly monitor pump performance or pressure readings.
The most common cause of P2404 (Evaporative Emission System Leak Detection Pump Sense Circuit Range/Performance) is: Failing leak detection pump with erratic pressure sensor or switch
Typical repair costs for P2404 range from $200 to $700, depending on the vehicle, location, and whether you do it yourself or go to a shop.
No safety impact on driving. Emissions compliance will be affected and vehicle may fail emissions inspection.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2404 to identify the root cause.
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Quick Info
Category
Powertrain
System
Evaporative Emissions System
Difficulty
Type
Generic (SAE)
Recommended Tools
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