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Home / DTC / P243E — Particulate Filter Regeneration Incomplete Bank 2

P243E — Particulate Filter Regeneration Incomplete Bank 2

Detailed page for trouble code P243E.

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P243E

Generic P — Powertrain

Particulate Filter Regeneration Incomplete Bank 2

Brand: Generic
Type: P — Powertrain
Views: UK: 21 EN: 39 RU: 16
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Page language: EN

Causes

  • Clogged or heavily loaded DPF (bank 2)
  • Faulty or out-of-range DPF differential pressure sensor
  • Upstream or downstream exhaust temperature sensor failure or incorrect reading
  • Incomplete/failed active regeneration due to low exhaust temperature (insufficient fuel injection or glow assist)
  • Exhaust leak on bank 2 upstream of the DPF
  • Low fuel pressure or faulty fuel injectors (bank 2) preventing post-injection during regen

Symptoms

  • DPF/Service engine light illuminated and possible DPF warning message
  • Frequent regeneration requests or regeneration in progress message without completion
  • Reduced engine power / limp-home mode on repeated failures
  • Increased fuel consumption due to repeated regen attempts
  • Visible black smoke on acceleration (if regen incomplete)
  • Strong diesel smell from exhaust or visible soot at tailpipe

What to check

  • Read and record all stored and pending DTCs and freeze frame data with a capable scan tool
  • Verify vehicle history: distance driven, idle time, towing/heavy load history, recent oil consumption or engine repairs
  • Check DPF differential pressure (ΔP) sensor live values upstream vs downstream at idle and during road load
  • Verify upstream and downstream exhaust temperatures before, during and after a requested regen
  • Confirm commanded regen is present in PCM logs (scan tool) and measure soot mass estimate if available
  • Inspect for exhaust leaks upstream of the DPF on bank 2 and check turbocharger and intake system for faults

Signal parameters

  • DPF differential pressure: normal low at idle (
  • Upstream exhaust temperature during active regen: typically rises to 600–700 °C (varies by application)
  • Downstream temperature should increase within a few minutes of regeneration start (indicates filter heating)
  • Soot mass estimate or DPF load percentage should decrease after a completed regen
  • Fuel rail pressure should meet manufacturer spec during commanded post-injection (check live data)
  • Turbo boost (MAP) should reach commanded boost values during road load/regeneration

Diagnostic algorithm

  1. Retrieve all codes and freeze-frame data. Note conditions when regen was attempted (engine temp, vehicle speed, load).
  2. Check for multiple or related codes (sensors, injectors, boost, EGR) and address those first if present.
  3. Inspect exhaust upstream of DPF (bank 2) for leaks, cracks, or connections loose that could affect sensor readings or flow.
  4. Using a scan tool, monitor DPF ΔP, upstream/downstream temps, soot load estimate, fuel rail pressure and injector commands while commanding a forced regeneration per manufacturer procedure. Do not force a regen in an enclosed area—ensure safety.
  5. If commanded regen shows no temperature rise or soot reduction: verify post-injection/fuel delivery to bank 2 (inspect injectors, rail pressure, injector driver signals).
  6. If temperatures do rise but soot does not reduce, suspect physical blockage or collapsed substrate — measure backpressure or perform a flow test and consider DPF removal/inspection or lab cleaning.
  7. If sensors show implausible values, test/replace DPF ΔP and temperature sensors and retest regeneration. Check wiring harness and grounds for damage or corrosion.
  8. Repair identified root cause (sensor, injector, exhaust leak, turbo, EGR). After repair, clear codes and perform controlled road load or forced regen until soot load and parameters return to normal. Confirm no recurrence.
  9. If DPF cannot be cleaned to specification or if substrate is damaged, replace the DPF assembly for bank 2 and re-run adaptation/regeneration procedures per manufacturer.
  10. After repair and successful regen, reset adaptation values as required and road test to confirm durability.

Likely causes

  • High soot accumulation in DPF (most likely)
  • Faulty DPF differential pressure or temperature sensor (next most likely)
  • Failed or intermittent fuel injector(s) or low rail pressure preventing active regen
  • Exhaust leaks or turbo/boost problems reducing exhaust temp and flow
  • EGR system malfunction allowing dilution of exhaust gases during regen

Fault status

⚠️ Status
Powertrain control module reports an incomplete active diesel particulate filter regeneration event on bank 2: required soot reduction or temperature/pressure changes were not achieved within allowable limits.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5-4.0 hours

Similar codes

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