Subaru vehicles are known for their superior performance and reliability. However, certain codes can occur that can cause problems for the owner. One of the most common codes for Subaru vehicles is P0442, which is an Evaporative Emission Control System Leak Detected (Small Leak) code.
This code is marked by fuel odor and may indicate a hole of more than 1.0 mm (0.04 in) dia. in the evaporation system or fuel tank. The ECT and IAT sensors must be more than 90ºF to diagnose the issue. Within 12ºF at startup, the system voltage must be between 11-16 volts, the throttle angle must be over 75%, the MAP sensor must be more than 75 kPa, the vehicle must be driven at a steady cruise speed greater than 31 mph, the fuel must be between 15-85%, and the PCM must detect a vacuum decaying condition. Understanding the causes and solutions to the Subaru Code P0442 can prevent costly repairs and ensure the vehicle’s safety.
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Causes and Solutions of Subaru Code P0442
| Cause | Solution |
|---|---|
| The fuel filler cap was not tightened | Tighten the fuel filler cap |
| The fuel filler cap is not genuine | Replace the fuel filler cap |
| Damage to the seal between the fuel filler cap and the fuel filler pipe | Replace seal |
| The drain valve does not operate | Replace drain valve |
| Defective purge control solenoid valve | Replace solenoid valve |
| The evaporative emission control system line needs to be repaired | Repair system line |
| Damaged canister | Replace canister |
| Damaged fuel tank | Replace fuel tank |
| Hole, crack, clogging, or disconnections, bends, or misconnection of hoses or pipes in evaporative emission control system | Repair hoses or pipes |
Subaru owners are too familiar with the P0442 code, which stands for Evaporative Emission Control System Leak Detected (Small Leak). This code is triggered when fuel odor is detected and can indicate a hole of more than 1.0 mm (0.04 in) dia. in the evaporation system or fuel tank. The ECT and IAT sensors must be more than 90ºF to diagnose the issue. Within 12ºF at startup, the system voltage must be between 11-16 volts, the throttle angle must be over 75%, the MAP sensor must be more than 75 kPa, the vehicle must be driven at a steady cruise speed greater than 31 mph, the fuel must be between 15-85%, and the PCM must detect a vacuum decaying condition. Fortunately, several causes and solutions to the Subaru Code P0442 can help owners prevent costly repairs and ensure the vehicle’s safety.
Fuel Filler Cap Not Tightened
If the fuel filler cap is not tightened correctly, it can cause the P0442 code. To solve this, pull the fuel filler cap.
Fuel Filler Cap Not Genuine
If the fuel filler cap is not genuine, it can cause the P0442 code. Replace the fuel filler cap with an original Subaru part to solve this.
Damage to the Seal Between the Fuel Filler Cap and the Fuel Filler Pipe
If the seal between the fuel filler cap and the fuel filler pipe is damaged, it can cause the P0442 code. To solve this, replace the seal.
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Drain Valve Does Not Operate
If the drain valve does not operate correctly, it can cause the P0442 code. To solve this, replace the drain valve.
Defective Purge Control Solenoid Valve
If the purge control solenoid valve is defective, it can cause the P0442 code. To solve this, replace the solenoid valve.
Evaporative Emission Control System Line Needs Repair
If the evaporative emission control system line needs repair, it can cause the P0442 code. To solve this, repair the system line.
Damaged Canister
If the canister is damaged, it can cause the P0442 code. To solve this, replace the canister.
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Damaged Fuel Tank
If the fuel tank is damaged, it can cause the P0442 code. To solve this, replace the fuel tank.
Hole, Crack, Clogging, Disconnections, Bend, or Misconnection of Hoses or Pipes in Evaporative Emission Control System
A hole, crack, clogging, disconnection, bend, or misconnection of hoses or pipes in the evaporative emission control system can cause the P0442 code. To solve this, repair the hoses or pipes.
Conclusion: Essential Solutions to Subaru Code P0442
Subaru vehicles are known for superior performance and reliability, but certain codes can cause problems for the owner. The Subaru Code P0442 is one of the most common codes for Subaru vehicles and is marked by fuel odor and may indicate a hole of more than 1.0 mm (0.04 in) dia. in the evaporation system or fuel tank. Fortunately, some causes and solutions to the Subaru Code P0442 can help owners prevent costly repairs and ensure the vehicle’s safety. From tightening the fuel filler cap to replacing the canister, understanding the causes and solutions to the Subaru Code P0442 can prevent costly repairs and ensure the vehicle’s safety.