Fault Family System: Powertrain (P-Codes) 6 SAE Codes

PM Sensor Heater Circuit

Diagnostic & Technical Explanation

Code P24B3 (Particulate Matter Sensor Heater Control Circuit/Open) sets when the ECM detects an open circuit, out-of-range current, a driver over-temperature condition, or an implausible resistance while driving the heater that brings the particulate matter sensor's sensing element to operating temperature and burns accumulated soot off between readings. Causes are a failed heater element inside the sealed sensor, a corroded connector, or a heater driver stage overheating from a partially shorted element.

These 6 diagnostic trouble codes share one detection mechanism and one repair path, which is why MechanicDB groups them into a single authored fault family rather than repeating the same explanation 6 times.

Codes in this family (6)

Code	Definition	Repair coverage
P24B3	Particulate Matter Sensor Heater Control Circuit/Open	3 ranked fixes
P24B4	Particulate Matter Sensor Heater Control Circuit Range/Performance	3 ranked fixes
P24B5	Particulate Matter Sensor Heater Control Circuit Low	3 ranked fixes
P24B6	Particulate Matter Sensor Heater Control Circuit High	3 ranked fixes
P24B7	Particulate Matter Sensor Heater Resistance	3 ranked fixes
P24FC	Particulate Matter Sensor Heater Control Circuit Driver Current/Temperature Too High	3 ranked fixes

What this page does not show

This page publishes the fault mechanism and the code index. The licensed dataset adds, for every one of the 15,886 codes, the full authored repair set (56,729 procedures in total) with the fields deliberately withheld here:

Procedures 2..n after the first-listed procedure
Aftermarket parts cost ranges in USD (est_parts_cost_min/max_usd)
Professional labor-hour estimates (est_labor_hours)
Step-by-step diagnostic and repair instructions
Replacement-part mappings and catalog lookups
6,637 manufacturer-specific OEM codes across 32 makes ($149 tier)

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