EVAP Leak Detection Pump Heater Circuit/Open
Code P240A 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 temperatures. 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.
1. 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
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Failed emissions test
- Possible fuel odor
- No noticeable drivability issues
3. Step-by-Step Diagnosis
Step 1: Scan for codes and note freeze frame data.
Step 2: Visually inspect the pump and wiring for damage or corrosion.
Step 3: Test the heater circuit resistance with a multimeter (should be within spec).
Step 4: Check fuse and relay for the pump heater.
Step 5: If all else passes, replace the EVAP leak detection pump assembly.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
Yes, it is generally safe to drive, but the vehicle may fail an emissions test and the Check Engine Light will remain on.
How much does it cost to fix?▼
Repair costs typically range from $150 to $400, including parts and labor, depending on the cause and vehicle model.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.