Fault Family System: Powertrain (P-Codes) 7 SAE Codes

DPF Regeneration Performance

Diagnostic & Technical Explanation

Code P243C (Particulate Filter Regeneration Frequency Bank 2) sets when the ECM's DPF regeneration strategy finds active regeneration events happening too often, running too long, finishing incomplete, or unable to start because drive conditions never meet the sustained exhaust-temperature and load window the strategy requires. Frequent short-trip driving that never lets exhaust reach regeneration temperature, a failing EGT or differential-pressure sensor feeding the regeneration model bad data, and excess soot from a marginal injector or turbo fault are the common root causes.

These 7 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 7 times.

Codes in this family (7)

Code	Definition	Repair coverage
P243C	Particulate Filter Regeneration Frequency Bank 2	4 ranked fixes
P243D	Particulate Filter Regeneration Duration Bank 2	4 ranked fixes
P243E	Particulate Filter Regeneration Incomplete Bank 2	4 ranked fixes
P2458	Particulate Filter Regeneration Duration Bank 1	4 ranked fixes
P2459	Particulate Filter Regeneration Frequency Bank 1	4 ranked fixes
P246B	Vehicle Conditions Incorrect for Particulate Filter Regeneration	4 ranked fixes
P24A2	Particulate Filter Regeneration Incomplete Bank 1	4 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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