P240700: Evaporative Emission System Leak Detection Pump Sense Circuit Intermittent/Erratic
Diagnostic trouble code P240700 — what it means, the common
causes, and how to confirm the real fault before replacing parts.
What does P240700 mean?
P240700 indicates: Evaporative Emission System Leak Detection Pump Sense Circuit Intermittent/Erratic.
This relates to the Powertrain system.
Common causes of P240700
LDP diaphragm not seated properly, preventing reed switch from closing
Pressure remaining in EVAP system preventing accurate LDP test
Electrical failure in the LDP sense circuit
What to check (live data)
Display Group 071, Display Zone 1 - should read 'closed' when diaphragm is seated; reads 'open' when pressure is preventing diaphragm from seating
Reed switch status (open/closed) via measuring value block
Parts often involved in P240700
Leak Detection Pump (LDP) - including vacuum switch, reed switch, diaphragm, inlet valve, outlet valve, EVAP shut-off valve, diaphragm spring
Don't replace parts until the root cause is confirmed — many of these codes are caused by wiring, a connector or an upstream fault, not the part itself.
Get the confirmed root cause for P240700 — on YOUR vehicle
A code is a symptom, not a diagnosis. AutoDX Pro cross-checks several
independent assessments, pinpoints the actual root cause, gives you the
exact tests to confirm it, and shows the parts — only after the cause is
confirmed. Reads your scan-tool photo and decodes your VIN with open
recalls.
P240700 is a diagnostic trouble code: Evaporative Emission System Leak Detection Pump Sense Circuit Intermittent/Erratic.
What are the common causes of P240700?
Common causes include: LDP diaphragm not seated properly, preventing reed switch from closing, Pressure remaining in EVAP system preventing accurate LDP test, Electrical failure in the LDP sense circuit. The exact cause depends on the vehicle — confirm it before replacing parts.
Can I keep driving with P240700?
It depends on the fault and your symptoms. Some causes are minor, others can damage components or affect safety. Get the root cause confirmed before deciding.
How do I fix P240700?
Confirm the actual root cause with targeted tests first, then replace only the part that's at fault. AutoDX Pro gives you the root cause, the exact tests, and the parts for P240700 on your specific vehicle.