P24AE Particulate Matter Sensor Circuit

The resistive particulate matter sensor behind the diesel particulate filter collects soot on interlocking electrodes; a rising current between them shows that particles are leaking through the filter. P24AE covers a fault in that electrode circuit. Ford's 2023 diesel summary checks it after each sensor regeneration at 200 to 425 °C over 120 s and sets the code if more than 5 µA still flows although the electrodes should be clean. VW's 2014 Touareg list ties P24AE to the electrode voltage leaving 0.30 to 4.70 V and to a functional check with too little or too unchanged measuring current. Special coverage 16018 from GM extended the warranty for Cruze 2.0 diesel sensors of model years 2014–2015 that set P24AE or P24AF after contamination or moisture damage. P24AF is the plausibility check during sensor regeneration.

Likely causes

Symptoms

• Malfunction indicator lamp on
• Filter efficiency monitor cannot complete

Repair estimate

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

Parts involved

Related codes

References: fordservicecontent.com, static.nhtsa.gov, static.nhtsa.gov.