Share a caseSign in
EmissionsSeverity Low: usually safe to drive

P0452Evaporative Emission System Pressure Sensor/Switch "A" Low

What it means

The fuel tank pressure sensor signal is too low.

Symptoms

  • Check engine light
  • Possibly a fuel smell
  • Usually no change in how the car drives

Common causes

  • Signal shorted to ground
  • Missing 5 V reference
  • Faulty sensor

What to check first

  1. Check the 5 V reference and signal at the sensor
  2. Check for other 5 V reference codes
  3. Inspect the harness near the tank
Can I drive with P0452? Usually yes. P0452 rarely affects how the car drives, but it keeps the check engine light on and can fail an emissions test.

Generic OBD-II meaning. Manufacturer-specific meanings and checks can differ; always check the service information for the car.

Cases with P0452 (0)

Share yours

No published cases with this code yet.

Colleagues asking about P0452

Ask for help

Stuck on P0452? Describe what you measured and ask the community.

P0452: questions and answers

What does P0452 mean?

P0452: Evaporative Emission System Pressure Sensor/Switch "A" Low. The fuel tank pressure sensor signal is too low.

What are the symptoms of P0452?

Check engine light. Possibly a fuel smell. Usually no change in how the car drives.

What causes P0452?

Signal shorted to ground. Missing 5 V reference. Faulty sensor.

How do you diagnose P0452?

1. Check the 5 V reference and signal at the sensor 2. Check for other 5 V reference codes 3. Inspect the harness near the tank

Can I drive with P0452?

Usually yes. P0452 rarely affects how the car drives, but it keeps the check engine light on and can fail an emissions test.