Powertrain, generic (extended)

P24A4 Particulate Filter Restriction - Soot Accumulation Too High (Bank 1)

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P24A4 marks the critical stage for the bank 1 filter: the soot load is so high that a normal regeneration risks overheating and cracking the substrate. Deutz names P24A4-00 a critical soot load. GM's 2016 and 2018 diesel tables use P24A4 for a clogged filter that has to be replaced, judged from the filtered flow resistance derived from differential pressure, 5 failures in 10 samples, Type A with one trip; the 2018 table labels the line ash accumulation, so GM appears to use the code for a load no regeneration can remove. P2463 is the earlier soot warning, P242F the separate ash code. Many engines then reduce power and block automatic regeneration, so only a controlled service regeneration, cleaning or a new filter will help.

Likely causes

Earlier soot warnings or failed regenerations not dealt with
Excess soot from injectors, EGR valve or turbocharger faults
Filter saturated with ash at end of service life
Differential pressure measurement reading falsely high

Symptoms

  • Marked loss of power, limp mode
  • Automatic regeneration no longer runs
  • Malfunction indicator and filter warning lamp on

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€150–3,000
Time1–5 h

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

Parts involved

dpf b1

Related codes

P2463P242FP243FP24A2

References: serdia.deutz.com, gsi.ext.gm.com, gsi.ext.gm.com, law.cornell.edu.