What Does P240A Mean?
The heater control circuit for the leak detection pump has an open circuit or is not functioning. Some EVAP leak detection pumps use heaters to maintain optimal operating temperature for accurate testing.
Common Causes
35%
Open circuit in heater control wiring
30%
Failed heater element inside leak detection pump
20%
Blown fuse for EVAP system heater circuit
10%
Corroded or loose heater circuit connector
5%
PCM driver circuit failure
Diagnostic Steps
1
Step 1: Check EVAP system fuses and relays for blown fuse or faulty relay
2
Step 2: Locate leak detection pump and inspect heater circuit connector for damage or corrosion
3
Step 3: Measure resistance of heater element in leak detection pump (typically 5-20 ohms)
4
Step 4: Check for continuity in heater control circuit from PCM to pump connector
5
Step 5: If wiring is intact and heater resistance is infinite, replace leak detection pump
Estimated Repair Cost
$150 - $700
Parts + labor, varies by vehicle and location
The heater control circuit for the leak detection pump has an open circuit or is not functioning. Some EVAP leak detection pumps use heaters to maintain optimal operating temperature for accurate testing.
The most common cause of P240A (Evaporative Emission System Leak Detection Pump Heater Control Circuit/Open) is: Open circuit in heater control wiring
Typical repair costs for P240A range from $150 to $700, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive. May affect accuracy of EVAP leak testing in cold conditions, leading to emissions compliance issues.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P240A 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.
