Fault Family
System: Powertrain (P-Codes)
3 SAE Codes
Aftertreatment Component Incorrect
Diagnostic & Technical Explanation
Code P24FD (Particulate Filter A Incorrect) sets when the ECM's component-identification check finds the particulate filter or SCR catalyst installed does not match the part identity it expects, typically after a filter or catalyst replacement using the wrong part number or a counterfeit/reman unit missing its proper identification. The fix is verifying and installing the correct OE-matched component and letting the ECM relearn its identity, not a wiring or sensor repair.
These 3 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 3 times.
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)