EVAP Leak Detection Pump Heater Control Circuit High
The P240C code indicates that the powertrain control module (PCM) has detected a high voltage condition 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. A high voltage reading suggests a short to power, a faulty pump, or a wiring issue.
01. Most Common Causes
- Faulty EVAP leak detection pump
- Short to power in the heater control circuit
- Damaged wiring or connector
- Corroded or loose electrical connections
- 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: Use a scan tool to confirm the code and check for related codes.
Step 2: Visually inspect the EVAP leak detection pump and its wiring for damage or corrosion.
Step 3: Test the heater circuit voltage and resistance with a multimeter; compare to manufacturer specs.
Step 4: If circuit is shorted, repair wiring; if pump is faulty, replace it.
04. Commonly Affected Makes
05. 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?▼
The cost typically ranges from $50 to $150 for diagnosis and repair, depending on the cause and labor rates.