P240C: Volkswagen leak-detection pump heater high-current classification

P240C identifies the high classification for the leak-detection pump heater-control circuit in Volkswagen's 2014 CBTA/CBUA chart. The manufacturer's detailed criterion uses current rather than a high-voltage reading.

“High” does not mean every test should measure voltage

Volkswagen lists signal current above a threshold range of 2.2–4 amperes. The exact threshold within that range is not assigned to an individual calibration in the quick-reference row. Preserve both the measurement type and that limitation when interpreting data.

The nearby P240B heater fault uses a low-voltage criterion, while P240A uses a different voltage-based classification. The heater-code family therefore cannot be reduced to one interchangeable voltage test.

Keep the heater separate from the pump

P240C concerns the heater circuit. Other codes on the page identify the leak-detection pump motor control. A heater-current event does not directly establish a motor fault or the existence of a fuel-vapor leak.

Professional diagnosis should use the correct heater path and current-test method from the full workshop procedure. The summary supplies no safe external energizing instruction, normal heater resistance or failed-part conclusion. It supports the recorded high-current classification while leaving the cause and appropriate repair to configuration-specific testing.

Source: Volkswagen manufacturer diagnostic chart, physical PDF page 80; physical PDF page 87.