Powertrain
Generic/SAE
OBD-II Fault Code
P0452: Evaporative Emission Control System Pressure Sensor Low Input
Meaning, symptoms, likely causes, diagnostic checks and repair guidance for P0452.
EVAP / fuel vapour
Use this category to narrow your checks before replacing parts.
Low
Severity is a general guide. Confirm with scan-tool data and vehicle symptoms.
What P0452 usually means
Evaporative Emission Control System Pressure Sensor Low Input.
Common symptoms
Check Engine light; Poor drivability or reduced fuel economy depending on fault; Fuel smell possible; Usually little drivability change
Likely causes
Loose/damaged fuel cap; Cracked EVAP hose; Faulty purge/vent valve; Leaking canister; Low signal voltage; Weak power supply; High resistance/poor ground; Failed sensor
Diagnostic checks
Scan all modules and record freeze-frame data before clearing codes; Check battery voltage and related fuses; Check fuel cap seal first; Smoke-test EVAP system; Command purge/vent valves with scan tool if available; Check sensor reference voltage, ground and signal voltage
Repair guidance
Replace damaged cap/hoses, repair leaks, replace stuck purge or vent valve after testing; Repair poor ground/power feed or replace confirmed faulty sensor
Verification after repair
Clear code, road-test through the same drive condition, then rescan