P1441 — A/C Evaporator Air Temperature Circuit Low

P1441 — A/C Evaporator Air Temperature Circuit Low. A fault in the evaporative emission (EVAP) system. The car is usually drivable while you plan the repair. Typical causes: faulty purge valve (canister purge solenoid), small leak in the fuel tank or filler neck, faulty vent valve or leak detection pump.

For Ford vehicles

ELC system 1(Jaguar

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

Read the code and freeze frame Connect an OBD2 scanner, confirm P1441 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
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.
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.
Subsystem check Check for supply voltage at the A/C evaporator air temperature connector first; then measure resistance from the signal wire to ground — near-zero ohms confirms a short to ground in the harness.
Subsystem check Check the fuel cap first — it is the most common cause; inspect the seal and tighten until it clicks.
Subsystem check Run an EVAP leak test (smoke test) to locate small leaks in hoses, canister and valves.
Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P1441 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for P1441 (parts and labor, USD, independent shop rates): Replace the fuel cap: $20–$60; Replace the charcoal canister: $250–$700; Replace the purge or vent valve: $120–$350. Overall, fixing P1441 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 are the symptoms of P1441?

Drivers most often notice: Check Engine Light on, difficulty refueling (nozzle clicks off), fuel smell near the car, especially after refueling, slightly worse fuel economy.

Is it safe to drive with P1441?

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 much does it cost to fix P1441?

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

How do I diagnose P1441 myself?

Start with a scan: confirm P1441, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the A/C evaporator air temperature, and verify the suspect component against live data before buying parts.

What does OBD2 code P1441 mean?

When your OBD2 scanner pulls code P1441, it's telling you the engine control unit has detected a problem with the air conditioning evaporator air temperature circuit — specifically, the voltage in that circuit has dropped below the minimum acceptable threshold. This falls under the powertrain category, meaning it relates to engine and emission control systems rather than comfort features. The term "circuit low" tells you the signal is sitting near ground potential, which suggests something is either pulling the voltage down or preventing it from reaching the sensor properly.

The evaporator air temperature sensor plays a role in how your vehicle manages cabin cooling and defogging. When this circuit registers abnormally low voltage, the ECU recognizes the reading as invalid and triggers P1441 once the condition persists long enough across multiple drive cycles. At that point, the stored fault code and freeze frame data give you a snapshot of engine speed, load, temperature, and vehicle speed at the exact moment the problem was detected — valuable information that guides your diagnosis.

Common Symptoms of P1441

The check engine light is the most obvious sign that P1441 has been set, and in many vehicles that's the only symptom drivers notice. However, some owners report additional clues tied to evaporative emission system stress:

Illuminated check engine lamp
Fuel tank resisting proper fill-up; the nozzle shuts off prematurely
Noticeable fuel odor around the vehicle, particularly after refueling
Slightly reduced fuel economy over time
In most cases, no change to how the car drives or performs

What Causes P1441

P1441 typically originates from one of several emission system failures. The most frequent culprits include a faulty A/C evaporator air temperature sensor dragging the signal low, loss of supply voltage to that sensor, or a chafed wire in the harness shorting the signal to ground. Beyond the sensor itself, common causes involve the EVAP system's related components:

Failed A/C evaporator air temperature sensor
Missing supply voltage to the temperature sensor circuit
Signal wire shorted to ground due to damaged insulation
Cracked or disconnected EVAP hoses and lines
Small fuel tank or filler neck leak
Malfunctioning purge valve (canister purge solenoid)
Saturated or damaged charcoal canister
Faulty vent valve or leak detection pump

How to Diagnose P1441

Effective diagnosis follows a logical path from simple checks to more involved testing. Here's a practical approach:

Connect an OBD2 scanner, retrieve P1441, and record the freeze frame data — note engine RPM, load, coolant temperature, and vehicle speed when the fault occurred.
Look for related diagnostic trouble codes; secondary codes often point to the root cause. Check manufacturer technical service bulletins for your specific make and model, as many P0xxx codes have documented factory fixes or software updates.
Perform a visual inspection of the EVAP wiring harness and connectors, paying attention to areas prone to chafing, corrosion, or loose pins.
Test for supply voltage at the A/C evaporator air temperature sensor connector. Then check resistance from the signal circuit to ground — a reading near zero ohms indicates a short to ground somewhere in the harness.
Inspect the fuel cap first; a damaged seal or loose cap is the most common trigger for EVAP-related codes. Tighten it until you hear the click, or replace it if the seal is worn.
Conduct an EVAP leak test using a smoke machine to pinpoint small leaks in hoses, the charcoal canister, and valves.
Clear the code, drive the vehicle through a complete drive cycle matching the conditions captured in the freeze frame, and verify P1441 does not reappear.

Repair Options and Costs

Repairs range from inexpensive quick fixes to more substantial component replacements. Tackle the cheapest possibilities before investing in costly parts:

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

The total cost to repair P1441 generally falls between $20 and $700 depending on which component is responsible. An accurate diagnosis before purchasing parts is strongly recommended — spending money on expensive components when the issue is a simple loose gas cap is easily avoided.

Driving Safety Verdict

P1441 is classified as a short-term safe condition. Evaporative emission faults do not affect engine performance, braking, or steering, so continuing to drive the vehicle while you arrange repairs is acceptable. That said, a persistent fuel vapor smell warrants faster attention — gasoline vapors are flammable and present health risks with prolonged exposure.