Powertrain, generic (extended)

P24B2 Particulate Matter Sensor Circuit Intermittent

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P24B2 stands for a PM sensor electrode reading that cuts out or jumps for short moments rather than staying permanently low or high. Such dropouts usually come from a loose pin, a chafed harness near the hot exhaust or moisture in the connector. FCA documents the code for Jeep Compass diesels: bulletin 18-008-23 lists P24B2 for 2019 vehicles with the 2.0L engine (sales code EBS), and 18-026-23 for 2022 models, both fixed by reprogramming the PCM. Neither bulletin publishes a threshold. CARB requires the system to catch circuit continuity faults of the PM sensor. P24B0 and P24B1 are the steady low and high faults. Drivers mostly see only the warning lamp, but the filter monitor pauses while the signal is unreliable.

Likely causes

Loose or corroded pin in the sensor connector
Harness chafing on hot exhaust parts
Engine control software that needs reprogramming
Intermittent internal sensor fault

Symptoms

  • Malfunction indicator lamp on, sometimes going out again
  • Particulate filter monitor does not complete

Repair estimate

DifficultyMediumDIY possible
Parts and labour€50–600
Time0.5–2 h

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

Parts involved

particulate matter sensor

Related codes

P24B0P24B1P24AEP24CA

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