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Home / DTC / P24FF — Reductant Temperature Too High

P24FF — Reductant Temperature Too High

Detailed page for trouble code P24FF.

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Code

P24FF

Generic P — Powertrain

Reductant Temperature Too High

Brand: Generic
Type: P — Powertrain
Views: UK: 18 EN: 22 RU: 14
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Page language: EN

Causes

  • Actual reductant fluid temperature above safe limit (localized overheating)
  • Faulty reductant temperature sensor (NTC/thermistor)
  • Reductant heater stuck on or heater relay/driver shorted
  • Wiring short to battery/voltage, open or poor connection at sensor
  • Corroded/contaminated connector or pins
  • Control module (ECM/PCM) fault or incorrect software/calibration

Symptoms

  • Malfunction Indicator Lamp (MIL) or engine warning illuminated
  • DEF/Reductant system warning messages in instrument cluster
  • Reduced SCR/NOx control efficiency; possible emissions-related derate
  • Regeneration or aftertreatment warnings/errors
  • Possible limp-mode or reduced engine power in some vehicles

What to check

  • Read and record freeze frame and all stored codes with a scan tool; note operating conditions when code set
  • Visual inspection of reductant tank area, sensor, wiring harness, connectors and heater relay/fuse for damage, corrosion or contamination
  • Check reductant level and sample for contamination or unusual odor/temperature
  • With scan tool, monitor reductant temperature sensor value and heater command in real time
  • Check for additional related DTCs (heater circuit, quality sensor, communication faults)
  • Inspect fuses and relays for the reductant heater circuit

Signal parameters

  • Reductant temperature sensor output should change with ambient/engine conditions; scanner should show rising/falling temp when warmed/cooled
  • Sensor voltage output typically within ~0.2–4.8 V across operating range (varies by manufacturer)
  • Heater command duty cycle or ON/OFF status visible via scan tool (0–100% or on/off)
  • Heater current draw typically limited (manufacturer specific); unexpected high current indicates short or short-to-ground, zero when not commanded may indicate open circuit
  • Freeze frame: ambient temp, vehicle speed, engine load, reductant temp at fault set

Diagnostic algorithm

  1. Connect a capable scan tool, retrieve P24FF and any related codes and freeze frame data
  2. Perform a visual inspection: check sensor connector, harness for chafing, heat damage, corrosion or contamination; inspect DEF tank and lines
  3. With key ON (engine off) monitor reductant temperature sensor voltage/temperature with scanner; compare to ambient temp — sensor should read reasonable value
  4. If available, unplug sensor and check for open/short using multimeter; measure sensor resistance vs temperature if spec available
  5. Check heater circuit: with scanner command heater ON and observe heater current or duty; verify circuit voltage at heater connector and check fuse/relay
  6. If heater is commanded OFF but sensor reads high, suspect sensor or short to voltage; if heater is commanded ON continuously, inspect relay/driver and associated wiring for short-to-ground or stuck relay
  7. Inspect reductant for contamination or evidence of chemical reaction or overheating in tank (use appropriate PPE)
  8. Repair or replace faulty wiring, connector, sensor, or heater module as indicated; update ECM software if manufacturer bulletin applies
  9. Clear codes, perform functional test and road test to confirm repair; monitor for reappearance of code

Likely causes

  • Faulty reductant temperature sensor
  • Heater element stuck ON or heater driver short to voltage
  • Shorted or damaged wiring/connector at sensor
  • Corroded connector causing false high reading
  • ECM commanding heater incorrectly or ECM software issue

Fault status

⚠️ Status
Code set when reductant temperature reading exceeds allowed threshold or when heater/sensor circuit indicates over-temperature condition; usually stored with freeze-frame and may illuminate MIL.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P24F0 P24F1 P20EE P20EF P24FE
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