P0450
PowertrainEvap Systemlow severityEvaporative Emission System Pressure Sensor/Switch Malfunction
What P0450 Means
The PCM detected a fault with the EVAP pressure sensor or switch. This can prevent accurate monitoring of fuel vapor system pressure.
Symptoms
- Check engine light on
- Failed emissions test
- No driveability change
Common Causes
- Faulty EVAP pressure sensor
- Wiring or connector fault
- Damaged fuel tank or vapor lines
- Failed PCM input circuit
Diagnostic Steps
- Retrieve code and freeze frame
- Inspect pressure sensor wiring
- Test sensor signal and reference voltage
- Verify EVAP system integrity
🔌 Don't have a code reader?
Any of these will read and clear this code — pick by how deep you want to go.
Budget handheld~$40
ANCEL AD410 →
No-phone-needed handheld — reads, clears, live data, freeze frame.
✓ ANCEL official store
Serious DIY~$100
BlueDriver Pro →
Enhanced codes (ABS, airbag, TPMS) plus repair reports.
SHOP FAVORITEShop-grade tablet~$300
Autel MaxiCOM MK808S →
Bidirectional tests, service resets, all systems.
✓ Autel official store
Pro diagnostics$1,500+
Autel MaxiSys MS906 Pro →
Full-system pro platform — topology mapping, ECU coding, the works.
✓ Autel official store
As an Amazon Associate and Autel/ANCEL partner, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.
Community Confirmed Fixes
No confirmed fixes yet for this code. Be the first to contribute!
Submit a FixFound a Fix for P0450?
Help other technicians by sharing what worked on your vehicle.
Submit Your Fix