What Does P240C Mean?
The leak detection pump heater control circuit voltage is higher than expected. This suggests an open ground, short to voltage, or problem with PCM control circuit.
Common Causes
35%
Open ground circuit for leak detection pump heater
30%
Short to voltage in heater control wiring
20%
Failed leak detection pump with open heater circuit
10%
Damaged connector with spread terminals causing poor ground contact
5%
PCM heater driver circuit failure
Diagnostic Steps
1
Step 1: Disconnect leak detection pump and measure voltage on heater control circuit (should drop to near zero)
2
Step 2: Verify good ground connection at leak detection pump mounting location and ground wire
3
Step 3: Check heater element resistance and continuity to ensure pump circuit is not open
4
Step 4: Inspect wiring for short to voltage, particularly near battery or ignition circuits
5
Step 5: Clean and secure all ground connections; if problem persists, test PCM heater driver output
Estimated Repair Cost
$100 - $650
Parts + labor, varies by vehicle and location
The leak detection pump heater control circuit voltage is higher than expected. This suggests an open ground, short to voltage, or problem with PCM control circuit.
The most common cause of P240C (Evaporative Emission System Leak Detection Pump Heater Control Circuit High) is: Open ground circuit for leak detection pump heater
Typical repair costs for P240C range from $100 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive. Only affects EVAP system diagnostic capability with no direct safety impact.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P240C 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.
