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Home / DTC / P214C — SCR NOx Catalyst Outlet Temperature Too High

P214C — SCR NOx Catalyst Outlet Temperature Too High

Detailed page for trouble code P214C.

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P214C

Generic P — Powertrain

SCR NOx Catalyst Outlet Temperature Too High

Brand: Generic
Type: P — Powertrain
Views: UK: 8 EN: 14 RU: 9
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Page language: EN

Causes

  • Faulty SCR NOx catalyst outlet temperature sensor (open/short or drift)
  • Heater circuit failure in the temperature sensor (if equipped)
  • Wiring harness or connector corrosion, short or open
  • Actual exhaust or catalyst temperatures excessively high (engine running hot, misfire, turbo/boost issues)
  • Blocked or restricted exhaust / high DPF backpressure
  • Incorrect or failed SCR/DEF dosing (overdosing or nozzle blockage)

Symptoms

  • Malfunction Indicator Lamp (MIL) or Check Engine light illuminated
  • Possible limp-home mode or reduced engine performance (manufacturer-dependent)
  • Failed emissions test or elevated NOx emissions
  • Reduced SCR efficiency / increased NOx readings from downstream sensors
  • Possible strong exhaust odors, smoke or visible soot if DPF/combustion issues present

What to check

  • Read and record freeze frame and all active/pending codes with a capable scan tool
  • Inspect the SCR outlet temperature sensor connector and wiring for corrosion, damage, or poor pins
  • Capture live data of SCR inlet and outlet temperatures under different loads (idle, cruise, acceleration)
  • Verify sensor heater power/ground (if sensor has integrated heater) and check sensor resistance against spec
  • Check NOx sensor readings and compare to expected values and between upstream/downstream sensors
  • Measure DPF backpressure and inspect for clogging or soot loading

Signal parameters

  • SCR NOx catalyst outlet temperature (°C or °F) — steady-state and transient behavior
  • SCR NOx catalyst inlet temperature (°C or °F) — for comparison
  • Sensor heater voltage/current and resistance (ohms) if applicable
  • NOx sensor voltages or ppm readings upstream and downstream of SCR
  • DEF/urea dosing quantity and injector pulse width (mg or ml per injection / pulses)
  • Exhaust backpressure (kPa) or differential pressure across DPF

Diagnostic algorithm

  1. Verify code P214C is active and note freeze frame data; check for additional related codes
  2. Perform visual inspection: connectors, wiring harness, sensor mounting and nearby exhaust components for heat damage
  3. Use scan tool to monitor live inlet/outlet SCR temperatures at idle and under load; look for unrealistic readings (stuck, slow, erratic)
  4. Check sensor heater circuit: measure voltage/ground and resistance; compare to manufacturer specification
  5. Perform wiring continuity and short-to-ground/power tests between sensor connector and ECM
  6. Compare downstream NOx sensor readings to upstream; a correct differential but high outlet temp points to real exhaust overtemperature rather than sensor fault
  7. Measure DPF/backpressure; clean or replace DPF if excessively restrictive
  8. Inspect and test DEF dosing system: ensure proper dosing commands, nozzle operation and that DEF is within specification (contamination can cause hot spots)
  9. If sensor tests fail, replace sensor and re-check; if sensor is good and temperatures are genuinely high, investigate causes of high exhaust gas temperatures (misfire, fueling, timing, turbocharger, EGR faults)
  10. If SCR catalyst damage suspected (melting, cracking, sintering), consult manufacturer procedures for catalyst testing and replacement; after repairs clear codes and perform road test and functional checks
  11. Check for ECU software updates or calibrations if diagnostics and components check OK but issue persists

Likely causes

  • Outlet temperature sensor failure or intermittent connector problem
  • Sensor heater open/failure preventing correct reading
  • Exhaust restriction (DPF full or collapsed pipe) causing elevated temperature at catalyst outlet
  • Faulty DEF/urea dosing causing uneven reaction and hot spots
  • Genuine SCR catalyst damage from overheating or contamination
  • High engine-out temperatures from fueling, timing or turbocharger faults raising exhaust temps

Fault status

⚠️ Status
P214C — SCR NOx Catalyst Outlet Temperature Too High. Set when the SCR outlet temperature sensor reports values above the allowed threshold or the ECM detects excessive catalyst outlet temperature. May be caused by a bad sensor or heater, wiring faults, excessive exhaust temperatures, blocked exhaust/DPF or SCR dosing/system faults. MIL illumination and emissions impact possible.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5-3.0 hours

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P0420 P0421 P2201 P2202 P2203 P2002
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