EVAP Leak Detection Pump Heater Circuit/Open
The P240A code indicates a problem in the heater control circuit of the Evaporative Emission (EVAP) leak detection pump. This pump is part of the EVAP system, which prevents fuel vapors from escaping into the atmosphere. The heater helps the pump operate in cold conditions. When the PCM detects an open or malfunction in the heater circuit, it sets this code. Common causes include a faulty pump assembly, damaged wiring, or a blown fuse.
01. Most Common Causes
- Faulty EVAP leak detection pump assembly
- Open or shorted heater circuit wiring
- Blown fuse or relay for the pump heater
- Corroded or loose electrical connector
- Failed PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Failed emissions test
- Possible fuel odor
- No noticeable drivability issues
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect the pump and wiring for damage or corrosion.
Step 3: Test the heater circuit resistance at the pump connector (should be 2-10 ohms).
Step 4: Check for power and ground at the pump connector with the engine running.
Step 5: If power/ground missing, check fuses, relays, and PCM output.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
Yes, the vehicle is generally safe to drive, but it may fail an emissions test and the check engine light will stay on.
How much does it cost to fix?▼
Repair costs typically range from $150 to $400, depending on the part and labor. The pump assembly itself can cost $100-$250.