Powertrain, generic (extended)

P24D5 EVAP System Pressure Sensor/Switch B Circuit

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P24D5 is the general circuit code for a second EVAP pressure sensor, called B to tell it apart from the main sensor A (P0450 range). Which sensor is B depends on the maker: Mitsubishi's 2023 Outlander PHEV uses it for an absolute fuel tank pressure sensor on its sealed tank, GM for a canister vapour pressure sensor, and Audi's bulletin 2069531 assigns sensor 2 to the G950 part in the purge path. No manufacturer documents P24D5 itself publicly; all three use the more specific P24D6 to P24D8. CARB requires circuit checks on every EVAP input. A stored P24D5 suggests a fault in the 5 V reference, ground or signal wire of that sensor; until it is fixed the leak or purge diagnostics depending on it are blocked.

Likely causes

Open or shorted reference, ground or signal wire of sensor B
Loose or corroded connector at sensor B
EVAP pressure sensor B failed

Symptoms

  • Malfunction indicator lamp on
  • EVAP readiness monitor incomplete

Repair estimate

DifficultyMediumDIY possible
Parts and labour€50–350
Time0.5–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

evap pressure sensor b

Related codes

P24D6P24D7P24D8P24D9P0450

References: law.cornell.edu, static.nhtsa.gov, mitsubishitechinfo.com.