What Does P2401 Mean?
The PCM has detected abnormally low voltage in the leak detection pump control circuit. This suggests a short to ground or excessive current draw in the pump circuit.
Common Causes
35%
Short to ground in wiring between PCM and leak detection pump
30%
Failed leak detection pump with internal short to ground
20%
Damaged or pinched wiring harness causing intermittent ground
15%
Corroded pump connector causing high resistance or ground path
Diagnostic Steps
1
Step 1: Disconnect leak detection pump connector and clear codes, then retest to see if code returns
2
Step 2: With pump disconnected, measure resistance to ground on PCM control wire (should be high resistance/open)
3
Step 3: Inspect wiring harness for pinch points, chafing, or damage near fuel tank and body penetrations
4
Step 4: Test leak detection pump by measuring resistance across terminals (check service manual for specs)
5
Step 5: Check for proper ground connection at pump mounting location
Estimated Repair Cost
$180 - $550
Parts + labor, varies by vehicle and location
The PCM has detected abnormally low voltage in the leak detection pump control circuit. This suggests a short to ground or excessive current draw in the pump circuit.
The most common cause of P2401 (Evaporative Emission System Leak Detection Pump Control Circuit Low) is: Short to ground in wiring between PCM and leak detection pump
Typical repair costs for P2401 range from $180 to $550, depending on the vehicle, location, and whether you do it yourself or go to a shop.
No immediate safety concern. Vehicle is safe to drive but emissions system will not function properly and may fail inspection.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2401 to identify the root cause.
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Quick Info
Category
Powertrain
System
Evaporative Emissions System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
