Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer thinks the sensor that checks the gas tank pressure is giving a weird reading. It's like if your toy thermometer said it was 100 degrees when it's snowing outside.
The EVAP system pressure sensor is responsible for monitoring the pressure within the evaporative emission system. An implausible signal indicates that the sensor is providing a reading that doesn't make sense based on the expected conditions.
The P147A code is triggered when the Engine Control Module (ECM) detects an implausible signal from the EVAP system pressure sensor. This could be due to a faulty sensor, wiring issues, or a problem within the EVAP system itself.
• Check Engine Light is on
• Possible fuel odor
• Failed emissions test
• Faulty EVAP system pressure sensor
• Damaged or corroded wiring/connectors
• Faulty ECM
EVAP: Evaporative Emission Control System, which prevents fuel vapors from escaping into the atmosphere.
ECM: Engine Control Module, the computer that manages engine functions.
• Use an OBD-II scanner to confirm the code.
• Inspect the EVAP system pressure sensor and its wiring for damage.
• Check the ECM for any related issues.
• Replace the EVAP system pressure sensor.
• Repair or replace damaged wiring/connectors.
• Reprogram or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$100 - $400
Moderate
• Ford Focus
• Chevrolet Malibu
• Toyota Camry
• Regularly inspect and maintain the EVAP system.
• Ensure proper fuel cap sealing.
• Avoid overfilling the fuel tank.
Sensor Issue
• Do not ignore the Check Engine Light.
• Have the vehicle inspected by a professional if unsure.
• Avoid driving long distances until the issue is resolved.
Check with the vehicle manufacturer for warranty coverage on emissions-related components.
The P147A code has been increasingly reported in vehicles with aging EVAP systems, particularly in models over 5 years old.
Moderate – While the vehicle may still be drivable, it can lead to increased emissions and potential fuel system issues.
Driving with an active Check Engine Light may result in a failed emissions test, which can be illegal in some regions.
• Vehicle at operating temperature
• Fuel tank between 15% and 85% full
The EVAP system pressure sensor is typically located near the fuel tank or within the EVAP canister.
Q: Can I drive with a P147A code?
A: Yes, but it's not recommended for long periods as it can affect emissions and fuel efficiency.
Q: How can I prevent this code from appearing?
A: Regular maintenance of the EVAP system and ensuring the fuel cap is properly sealed can help prevent this issue.
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Universal · Digital multimeter
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Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.
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Fitment Required · Vehicle-fitment part
Relevant when EVAP diagnosis points toward purge-flow or purge-control faults.
EVAP diagnosis often includes purge-flow and valve-control faults.
Confirm the failed valve and exact fitment before buying parts.
View options on AmazonThese parts may be related to this fault category, but a code by itself does not confirm exact fitment or guarantee that replacing a part will solve the problem.