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Home / DTC / P243B — Particulate Filter Restriction - Forced Limited Power Bank 2

P243B — Particulate Filter Restriction - Forced Limited Power Bank 2

Detailed page for trouble code P243B.

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P243B

Generic P — Powertrain

Particulate Filter Restriction - Forced Limited Power Bank 2

Brand: Generic
Type: P — Powertrain
Views: UK: 15 EN: 20 RU: 13
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Page language: EN

Causes

  • Clogged/sooted diesel particulate filter (DPF)
  • Failed or contaminated differential pressure sensor across the DPF
  • Faulty exhaust temperature sensors or wiring
  • Exhaust leak upstream of the pressure/temperature sensors
  • Failed turbocharger or boost system fault causing poor regeneration
  • Incomplete or failed regeneration cycles

Symptoms

  • Reduced engine power / limp-home mode active
  • Illuminated MIL / DPF warning lamp
  • Frequent or continuous regeneration requests with no successful regen
  • Poor acceleration and decreased fuel economy
  • Black smoke during acceleration (possible soot bypassing)
  • Unusual exhaust/backpressure noise

What to check

  • Read all stored and pending DTCs and freeze frame data with a capable scan tool.
  • Check live data: DPF differential pressure, exhaust temps before/after DPF, soot load, and commanded regen status.
  • Visually inspect differential pressure and temperature sensors, connectors, and wiring for damage or corrosion.
  • Inspect exhaust system for leaks or damage upstream of the DPF (including turbo and downpipe).
  • Confirm turbocharger and boost system integrity (hoses, intercooler, clamps).
  • Check for related engine faults that prevent regen (fuel system, EGR faults, misfire codes).

Signal parameters

  • DPF differential pressure (kPa or mbar)
  • Soot load / DPF fill percentage or calculated soot mass (g)
  • Exhaust temperature before DPF (°C)
  • Exhaust temperature after DPF (°C)
  • Turbocharger boost pressure / intake manifold pressure (kPa)
  • Commanded regeneration active flag and timer

Diagnostic algorithm

  1. Capture full DTC list and freeze-frame. Note conditions (engine speed, load, temperatures) when fault set.
  2. Inspect connectors and wiring to DPF differential pressure and exhaust temp sensors. Repair any damage.
  3. Check for exhaust leaks between turbo and DPF. Repair leaks before retesting.
  4. Use scan tool to monitor differential pressure and exhaust temps at idle and during road load. Compare to manufacturer limits.
  5. Command an active regeneration while monitoring temps and differential pressure. Verify exhaust temp rises and differential pressure falls after regen.
  6. If active regen does not complete or differential pressure remains high, check turbo/boost system and fuel system for faults that prevent proper regen temperatures.
  7. If sensors are out of range or show inconsistent signals, test and replace faulty sensors; recheck system operation.
  8. If sensors and supporting systems are good but DPF remains heavily restricted after attempted regen, perform a forced DPF clean (manufacturer-approved procedure) or removal and off-vehicle cleaning as required.
  9. If cleaning fails or DPF damage is found, replace the DPF. Clear codes and verify repair with a road test and live-data monitoring.
  10. After repair/cleaning, confirm no pending or permanent codes and that regeneration cycles complete normally.
  11. Safety note: follow safe procedures for high-temperature components and use proper tooling/equipment for forced regens and DPF removal.

Likely causes

  • High soot loading in DPF from long short-trip operation or oil burning
  • Differential pressure sensor out-of-spec or intermittent (false high pressure reading)
  • Exhaust temperature sensor out-of-range causing regeneration not to initiate
  • Exhaust leak between turbo and DPF causing incorrect sensor readings
  • Turbo underboost or intake leaks preventing required combustion temps for regen
  • DPF physically damaged internally or catalytic substrate collapsed

Fault status

⚠️ Status
Particulate Filter Restriction detected on Bank 2 — ECM has limited engine power to protect aftertreatment system.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 1.0-4.0 hours

Similar codes

P243A P242F P2458 P2004 P0299
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