Diagnostic article Generic OBD-II
P240A: Volkswagen leak-detection pump heater open-circuit monitor
P240A identifies the evaporative-system leak-detection pump heater control circuit's open classification in Volkswagen's 2014 CBTA/CBUA chart.
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Documented application
Volkswagen 2014 Golf/GTI/Golf R Quick Reference Specification Book, January 2014; CBTA/CBUA chart only. Source-scoped monitor explanation, not universal thresholds.
The code alone does not identify a failed part or establish that a vehicle is safe to drive. Confirm the vehicle, reporting module and applicable service procedure.
P240A identifies the evaporative-system leak-detection pump heater control circuit's open classification in Volkswagen's 2014 CBTA/CBUA chart. The heater is a distinct monitored circuit from the pump motor control.
The table separates heater and pump faults
Volkswagen lists a high monitored signal voltage with a threshold range of 4.7–5.4 volts for this heater entry. Nearby P2400 concerns pump control rather than the heater, even though its diagnostic voltage range looks similar. Similar numbers do not make the two circuit identities interchangeable.
The chart's range reflects the published criterion; it does not identify one exact calibration threshold or state that 5 volts should be applied externally. A diagnostic signal voltage is not necessarily the component's normal power-supply value.
What remains to be established
An open-circuit classification cannot locate the interruption by itself. The quick reference gives no wiring diagram, heater resistance, connector assignment or failed-component conclusion.
Professional diagnosis should identify the heater-control path and use the applicable electrical tests before selecting parts. Do not treat the code as proof of a vapor leak or a pump motor failure. This explanation applies to the documented CBTA/CBUA section, with configuration-specific verification still required before its values are used on an individual vehicle.
Source: Volkswagen manufacturer diagnostic chart, physical PDF page 80; physical PDF page 87.
Article source documents
Source checks describe how the text was prepared; they do not certify a diagnosis or confirm compatibility with every vehicle using this code.
Original code reference
Dictionary definition
EVAP System Leak Detection Pump Heater Control Circuit/Open
This definition retains its original catalog scope. The article above is limited to its explicitly documented application.
Reference scope
Generic OBD-II definition.
A manufacturer label does not establish the model, year, engine or module to which a diagnosis applies. Read the safety and diagnostic limits.
Definition source
- DTC Database: pinned community code definitions
Source checked · MIT