P240A — Evaporative Emission System Leak Detection Pump Heater Control Circuit/Open

powertrain (engine/transmission)

Is it safe to drive?

Short-term driving is OK Safe to drive. EVAP faults affect emissions, not drivability — you can keep using the car while planning the repair. Fuel vapour smell is a reason to fix it sooner: vapours are flammable and harmful.

How to diagnose with an OBD scanner

  1. Read the code and freeze frame Connect an OBD2 scanner, confirm P240A is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
  2. Check for companion codes and TSBs Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many P0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
  3. Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the evaporative emission (EVAP) system for damage, corrosion, chafing or poor contact.
  4. Subsystem check Check the fuel cap first — it is the most common cause; inspect the seal and tighten until it clicks.
  5. Subsystem check Run an EVAP leak test (smoke test) to locate small leaks in hoses, canister and valves.
  6. Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P240A does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for P240A (parts and labor, USD, independent shop rates): Replace the fuel cap: $20–$60; Replace the purge or vent valve: $120–$350; Replace the charcoal canister: $250–$700. Overall, fixing P240A usually costs between $20 and $700. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Common questions

What does OBD2 code P240A mean?

Evaporative Emission System Leak Detection Pump Heater Control Circuit/Open (P240A): a powertrain (engine/transmission) fault affecting the evaporative emission (EVAP) system. The car is usually drivable while you plan the repair. Most often caused by small leak in the fuel tank or filler neck, loose, damaged or wrong fuel cap, saturated or damaged charcoal canister.

What are the symptoms of P240A?

Drivers most often notice: difficulty refueling (nozzle clicks off), slightly worse fuel economy, no noticeable driving symptoms in most cases, fuel smell near the car, especially after refueling.

How do I diagnose P240A myself?

Start with a scan: confirm P240A, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the evaporative emission (EVAP) system, and verify the suspect component against live data before buying parts.

How much does it cost to fix P240A?

Replace the fuel cap — $20–$60; Replace the purge or vent valve — $120–$350; Replace the charcoal canister — $250–$700. Exact cost depends on the root cause, your vehicle and local labor rates — a proper diagnosis is the cheapest first step.

What is the most common cause of P240A?

The most common causes are: small leak in the fuel tank or filler neck, loose, damaged or wrong fuel cap, saturated or damaged charcoal canister.

What does P240A mean?

Behind P240A is a specific failure in the evaporative emission (EVAP) system: evaporative emission system leak detection pump heater control circuit/open. The onboard computer stores it in the powertrain (engine/transmission) group after verifying the fault over repeated checks.

The module monitors this system continuously while driving. When readings fall outside the expected range for a defined number of drive cycles, it stores P240A and switches on the warning light. Freeze frame data saved with the code shows the exact conditions — rpm, load, temperature, speed — at the moment the fault was detected, which is the best starting point for diagnosis.

Common symptoms of P240A

  • difficulty refueling (nozzle clicks off)
  • slightly worse fuel economy
  • no noticeable driving symptoms in most cases
  • fuel smell near the car, especially after refueling
  • Check Engine Light on

What causes P240A?

  • saturated or damaged charcoal canister
  • faulty vent valve or leak detection pump
  • cracked EVAP hoses or lines
  • faulty purge valve (canister purge solenoid)
  • loose, damaged or wrong fuel cap
  • small leak in the fuel tank or filler neck

How to diagnose P240A

  1. Connect an OBD2 scanner, confirm P240A is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
  2. Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many P0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
  3. Visually inspect the wiring harness and connectors related to the evaporative emission (EVAP) system for damage, corrosion, chafing or poor contact.
  4. Check the fuel cap first — it is the most common cause; inspect the seal and tighten until it clicks.
  5. Run an EVAP leak test (smoke test) to locate small leaks in hoses, canister and valves.
  6. Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P240A does not return.

How to fix P240A

Start with the cheapest and most common causes before replacing expensive parts:

  • Replace the fuel cap — $20–$60
  • Replace the purge or vent valve — $120–$350
  • Replace the charcoal canister — $250–$700

How much does it cost to fix P240A?

Repair cost depends on which component actually failed. Typical scenarios for P240A (parts and labor, USD, independent shop rates):

  • Replace the fuel cap: $20–$60
  • Replace the purge or vent valve: $120–$350
  • Replace the charcoal canister: $250–$700

Overall, fixing P240A usually costs between $20 and $700. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Can you drive with P240A?

Safe to drive. EVAP faults affect emissions, not drivability — you can keep using the car while planning the repair. Fuel vapour smell is a reason to fix it sooner: vapours are flammable and harmful.

Related OBD2 codes