What Does P2402 Mean?
The PCM has detected abnormally high voltage in the leak detection pump control circuit. This indicates a potential short to voltage, open ground, or pump circuit malfunction.
Common Causes
35%
Open circuit or damaged wiring in pump control or ground circuit
30%
Failed leak detection pump with open internal circuit
20%
Short to voltage in wiring harness
15%
Poor ground connection at pump or chassis ground point
Diagnostic Steps
1
Step 1: Inspect leak detection pump connector for corrosion, pushed-back pins, or loose connections
2
Step 2: Check ground circuit continuity from pump to chassis ground
3
Step 3: With pump connected, backprobe control circuit and check voltage while commanding pump on/off with scan tool
4
Step 4: Disconnect pump and check for shorts to voltage in control circuit wiring
5
Step 5: Test pump operation and current draw when powered directly with battery voltage
Estimated Repair Cost
$180 - $600
Parts + labor, varies by vehicle and location
The PCM has detected abnormally high voltage in the leak detection pump control circuit. This indicates a potential short to voltage, open ground, or pump circuit malfunction.
The most common cause of P2402 (Evaporative Emission System Leak Detection Pump Control Circuit High) is: Open circuit or damaged wiring in pump control or ground circuit
Typical repair costs for P2402 range from $180 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
No safety risk to vehicle operation. Emissions testing will fail and check engine light will remain illuminated.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2402 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 System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
