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Home / DTC / P249C — Excessive Time To Enter Closed Loop Reductant Injection Control

P249C — Excessive Time To Enter Closed Loop Reductant Injection Control

Detailed page for trouble code P249C.

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P249C

Generic P — Powertrain

Excessive Time To Enter Closed Loop Reductant Injection Control

Brand: Generic
Type: P — Powertrain
Views: UK: 17 EN: 56 RU: 16
AI status
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Page language: EN

Causes

  • Faulty or slow-responding NOx sensor (upstream or downstream)
  • Restricted/clogged reductant (DEF/urea) injector nozzle
  • DEF pump failure or insufficient pump pressure
  • Low DEF level, contaminated or frozen DEF
  • DEF tank heater or sensor malfunction (temperature/level)
  • Wiring harness or connector faults to NOx sensors, pump, injector, heaters or ECM

Symptoms

  • Malfunction Indicator Lamp (MIL) or Check Engine Light illuminated
  • Messages/warnings about DEF/Reductant system or aftertreatment
  • Possible engine derate or reduced performance depending on manufacturer strategy
  • Increased NOx emissions and failed emissions test
  • SCR system may not enter active dosing; prolonged warm-up before dosing
  • Possible DEF level low or quality warnings

What to check

  • Read and record all stored and pending DTCs plus freeze frame and pending events
  • Inspect DEF tank level and quality (water, crystallization, contamination)
  • Visually inspect wiring and connectors for NOx sensors, reductant pump, injector and heaters
  • Check for exhaust leaks upstream of NOx sensors and SCR inlet
  • Verify DEF tank heater and level sensor operation and DEF temperature
  • Check NOx sensor voltages, ppm readings and response time on live data

Signal parameters

  • NOx sensor raw and processed values (ppmv) upstream and downstream
  • NOx sensor response time and voltage/current
  • Reductant injector pulse width and commanded dosing rate (mg/km or mg/stroke)
  • DEF pump current draw and commanded operation
  • DEF level (%) and DEF temperature (°C/°F)
  • SCR inlet and outlet temperatures

Diagnostic algorithm

  1. Retrieve freeze frame data and all related codes (NOx sensors, DEF pump, injector, heaters). Note operating conditions when code set.
  2. Inspect DEF tank: check fill level, sample fluid for contamination or crystallization, verify correct DEF specification used.
  3. Visually inspect harnesses/connectors for corrosion, damage or loose pins at NOx sensors, reductant pump, injector and tank heater. Backprobe connectors while commanding components if safe.
  4. Check for exhaust leaks upstream of NOx sensors and SCR inlet and repair any leaks.
  5. Monitor live data during cold start and warm-up: confirm NOx sensor readings change with engine load and aftertreatment temperature; confirm DEF temp and level sensors report reasonable values.
  6. Command reductant pump and injector using diagnostic tool: verify pump runs, measure current, verify injector actuates and observe dosing pulse width and expected pressure/flow. Look for air in feed or restricted flow.
  7. If NOx sensors show no or slow response, test sensor heaters and signal circuits; replace suspect NOx sensors after verifying wiring integrity.
  8. If pump or injector fail functional test, test bench or replace pump/injector; clean or replace injector if clogged.
  9. Verify DEF heater operation if DEF temperature is too low to dose; repair heater or replace tank sensor as required.
  10. After repairs, clear codes and perform a verified drive cycle or manufacturer-specific diagnostic routine to confirm closed-loop reductant injection control is reached and P249C does not return.
  11. If system tests pass but issue persists, consider SCR catalyst condition and ECM/TCU software update or reflash as per manufacturer guidance.

Likely causes

  • NOx sensor(s) failed or slow to respond
  • Restricted DEF injector or injector stuck closed
  • DEF pump or feed line restriction/airlock
  • Low or contaminated DEF fluid
  • Faulty DEF heater or sensor preventing proper fluid temperature
  • Open/short wiring or poor connector at sensor/pump/injector

Fault status

⚠️ Status
P249C — Excessive Time To Enter Closed Loop Reductant Injection Control. ECM set fault when reductant dosing control did not transition to closed-loop within allowed time. Check NOx sensors, reductant pump/injector, DEF level/quality, heaters, wiring and exhaust leaks.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

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