P0442 on a 2017 Ford Escape
EVAP Small Leak Detected
What does P0442 mean on a 2017 Ford Escape?
P0442 is set when the EVAP system's small-leak monitor detects an opening approximately 0.040 inches (1.0 mm) or larger. This is the equivalent of the gas cap being left slightly loose or a small crack in a vent hose. The vehicle remains fully drivable and consumes no extra fuel, but the EVAP system can no longer hold the sealed vacuum required for compliance.
Symptoms on a 2017 Ford Escape
- Check Engine Light is illuminated
- Faint fuel smell, especially after refueling on a hot day
- No noticeable change in drivability or fuel economy
- Vehicle will fail emissions / smog testing
Likely causes on a 2017 Ford Escape
- Loose, worn, or cross-threaded fuel cap Most commonEstimated repair: $15– $60
- Aged or split EVAP hose CommonEstimated repair: $30– $200
- Failing purge or vent valve seal CommonEstimated repair: $80– $350
- Cracked EVAP charcoal canister OccasionalEstimated repair: $200– $600
- Damaged O-rings at hose-to-canister or hose-to-solenoid connections OccasionalEstimated repair: $20– $120
- Pinhole or seam leak in the fuel filler neck OccasionalEstimated repair: $150– $600
- Failed fuel tank vent at the tank top (less accessible to inspect) RareEstimated repair: $300– $900
How to diagnose this on a 2017 Ford Escape
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Tighten or replace the fuel cap
Remove and reinstall the fuel cap to at least three clicks. Inspect the rubber gasket for cracks, debris, or compression set. Replace with an OEM-spec cap if the gasket is damaged or the cap is more than 8 years old.
Tools: None
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Smoke-test the EVAP system
A 0.040-inch leak is too small to find by ear and almost always too small to see visually without smoke. Pressurize the EVAP system with smoke at the service port and trace the smoke trail to its source. Common leak points: behind the rear bumper near the canister, the hose between purge valve and intake, and the top of the fuel tank.
Tools: EVAP smoke machine, UV dye (optional), Inspection mirror and flashlight
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Inspect the EVAP service port itself
The green EVAP service port cap is a frequent leak point because its O-ring hardens and fails after years of heat cycles. With smoke already in the system, watch the service port specifically.
Tools: Inspection mirror
-
Visually inspect the charcoal canister
Many trucks and SUVs mount the canister behind the rear axle where it is exposed to road debris and salt spray. Cracks in the plastic housing are common on aging vehicles. Replace the canister if cracked or saturated.
Tools: Floor jack and stands, Trim panel tools
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Verify monitor completion before re-testing
After repair, drive 2–4 cold-start drive cycles with the tank between 25 % and 75 % full. Use a scan tool to confirm the EVAP readiness flag turns "ready." Clearing the code prematurely will set the light again as soon as the monitor runs.
Tools: Scan tool with readiness monitor display
Known Technical Service Bulletins for the 2015-2019 Ford Escape
Manufacturers publish Technical Service Bulletins (TSBs) when a known issue affects a specific vehicle. These bulletins come from the NHTSA database for your Ford Escape.
- UNKNOWN OR OTHER Feb 22, 2026
Ford and Lincoln vehicles equipped with wired keyless entry keypad systems and accessory wireless keyless entry keypad systems may or may not come with a wallet card containing the master code. Unlike the integrated wired keypad, the accessory wireless keypad master code cannot be retrieved from the vehicle using a diagnostic scan tool or from the label printed on the body control module (BCM). The Factory Keyless Entry Code application within the diagnostic scan tool will not provide an applicable master code for the accessory wireless keypad. If the wallet card for an accessory keypad is not available, the "Wireless RF Keypad Diagnosis Guide" can be referenced and provides direction on how to retrieve the master code. This guide is located under the Workshop Manual tab > Accessories > Installation > Wireless RF Keypad Diagnosis Guide > PPT C > Step C2.<br /><br /> Note: The only available keypad for some vehicles from the assembly plant is the accessory wireless keyless entry keypad. The integrated wired keypad cannot be installed on vehicles not equipped from the factory with a wired keyless entry k
NHTSA #11029052 - STRUCTURE Feb 22, 2026
Ford and Lincoln vehicles equipped with wired keyless entry keypad systems and accessory wireless keyless entry keypad systems may or may not come with a wallet card containing the master code. Unlike the integrated wired keypad, the accessory wireless keypad master code cannot be retrieved from the vehicle using a diagnostic scan tool or from the label printed on the body control module (BCM). The Factory Keyless Entry Code application within the diagnostic scan tool will not provide an applicable master code for the accessory wireless keypad. If the wallet card for an accessory keypad is not available, the "Wireless RF Keypad Diagnosis Guide" can be referenced and provides direction on how to retrieve the master code. This guide is located under the Workshop Manual tab > Accessories > Installation > Wireless RF Keypad Diagnosis Guide > PPT C > Step C2.<br /><br /> Note: The only available keypad for some vehicles from the assembly plant is the accessory wireless keyless entry keypad. The integrated wired keypad cannot be installed on vehicles not equipped from the factory with a wired keyless entry k
NHTSA #11029052 - ELECTRICAL SYSTEM Feb 22, 2026
Ford and Lincoln vehicles equipped with wired keyless entry keypad systems and accessory wireless keyless entry keypad systems may or may not come with a wallet card containing the master code. Unlike the integrated wired keypad, the accessory wireless keypad master code cannot be retrieved from the vehicle using a diagnostic scan tool or from the label printed on the body control module (BCM). The Factory Keyless Entry Code application within the diagnostic scan tool will not provide an applicable master code for the accessory wireless keypad. If the wallet card for an accessory keypad is not available, the "Wireless RF Keypad Diagnosis Guide" can be referenced and provides direction on how to retrieve the master code. This guide is located under the Workshop Manual tab > Accessories > Installation > Wireless RF Keypad Diagnosis Guide > PPT C > Step C2.<br /><br /> Note: The only available keypad for some vehicles from the assembly plant is the accessory wireless keyless entry keypad. The integrated wired keypad cannot be installed on vehicles not equipped from the factory with a wired keyless entry k
NHTSA #11029052 - ELECTRICAL SYSTEM Nov 25, 2025
This article supersedes TSB 24-2165 to update the TSB Service Procedure. Some vehicles listed in the Model statement above may exhibit various SYNC performance related concerns including but not limited to: Display operation concerns Navigation inoperative Voice recognition concerns Phone connection issues Dropped phone connections Applink related performance Travel Link not present or showing incorrect traffic Slow system response NOTE: Ford has found some of the APIMs replaced and returned for inspection contained an outdated software level and the APIM did not require replacement. The customer concern may have been resolved by updating the APIM with latest level of software. The SYNC 3 universal thumb drive will be able to update the APIM software without the use of a scan tool and does not require the process to be monitored. Ford will be monitoring APIM replacements to confirm TSB directed software updates have been performed.
NHTSA #11025837 - POWER TRAIN Nov 10, 2025
Some 2015-2021 Ford and Lincoln vehicles may exhibit an illuminated MIL with diagnostic trouble codes (DTCs) P0011, P0012, P0014, P0015, P0016, P0017, P0018, P0019, P0021, P0022, P0024 and/or P0025. Pinpoint test HK in the Powertrain Control and Emissions Diagnosis (PC/ED) or in Section 303-14 of the Workshop Manual (WSM) has been updated to address this concern.
NHTSA #11025611 - ELECTRICAL SYSTEM Nov 10, 2025
Some 2015-2021 Ford and Lincoln vehicles may exhibit an illuminated MIL with diagnostic trouble codes (DTCs) P0011, P0012, P0014, P0015, P0016, P0017, P0018, P0019, P0021, P0022, P0024 and/or P0025. Pinpoint test HK in the Powertrain Control and Emissions Diagnosis (PC/ED) or in Section 303-14 of the Workshop Manual (WSM) has been updated to address this concern.
NHTSA #11025611
+14 more TSBs available in MECH AI's TSB explorer for this vehicle.
Common fixes
- Replace the fuel cap
- Replace cracked EVAP hoses and aged O-rings
- Replace the EVAP purge valve or vent valve
- Replace the charcoal canister assembly
- Replace the fuel filler neck (rust or pinhole)
About the 2015-2019 Ford Escape
The 2015-2019 Ford Escape was commonly sold with the following powertrains: 1.5L EcoBoost I3, 2.0L EcoBoost I4, 2.5L Hybrid I4. Common trims include S, SE, SEL, Titanium.
P0442 vs P0455 vs P0456
The three EVAP leak codes describe the same kind of fault at different leak sizes:
| Code | Leak size threshold | Typical real-world cause |
|---|---|---|
| P0456 | ~0.020” (very small) | Cap O-ring, fresh hose pinhole |
| P0442 | ~0.040” (small) | Loose cap, aging hose, cracked vent valve seal |
| P0455 | ~0.090”+ (large or no seal) | Missing cap, disconnected hose, large canister crack |
A vehicle that sets P0456 today often sets P0442 in a few months as the same crack grows.
Why smoke testing is non-negotiable
EVAP leaks are usually too small to find any other way. A bare-eye inspection of every hose and joint will miss most P0442 causes. The smoke machine is a one-time tool purchase (or one-time shop diagnostic fee) that pays for itself on the first EVAP repair.
What “0.040 inch leak” actually means
OBD-II EVAP monitors do not measure the leak directly. They apply a calibrated vacuum or pressure to the sealed system and time how quickly it bleeds off. The leak-equivalent diameter is calculated from that decay rate. A real-world 0.040” hole and a 0.030” hole with a smaller restriction upstream can produce the same monitor result.