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Home / DTC / P2046 — Reductant Temperature Sensor A Circuit Intermittent

P2046 — Reductant Temperature Sensor A Circuit Intermittent

Detailed page for trouble code P2046.

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P2046

Generic P — Powertrain

Reductant Temperature Sensor A Circuit Intermittent

Brand: Generic
Type: P — Powertrain
Views: UK: 10 EN: 19 RU: 16
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Page language: EN

Causes

  • Damaged, chafed, or pinched wiring in the sensor harness
  • Corroded, loose, or contaminated connector(s) at the sensor or module
  • Failed reductant temperature sensor (NTC thermistor)
  • Intermittent power or ground to the sensor (including blown fuse, relay, or poor chassis ground)
  • Water or DEF crystallization/contamination in connector or sensor body
  • Poor splice or broken wire hidden in harness

Symptoms

  • Malfunction Indicator Lamp (MIL) or SCR system warning illuminated
  • One or more reductant/DEF system codes stored
  • Reduced or inhibited regen or de-rate of aftertreatment functions (depending on vehicle strategy)
  • Possible loss of reductant dosing heater control or heater fault messages
  • Inaccurate reductant temperature readings in live data
  • Intermittent operation of DEF heater (if tied to sensor)

What to check

  • Read and record freeze frame and live data for reductant temperature and related reductant/DEF parameters
  • Check for additional related DTCs (heater, dosing valve, NOx sensors) to help narrow cause
  • Visually inspect sensor, connector, and wiring along full harness length for damage, chafing, or DEF residue
  • Inspect connector for corrosion, bent pins, water ingress and ensure proper mating
  • Wiggle-test wiring and connector while monitoring live data and DTC status to reproduce intermittent behavior
  • Check fuses and relays that supply power to the sensor/heater circuits (if applicable)

Signal parameters

  • Sensor type: typically an NTC thermistor (resistance decreases as temperature rises)
  • Typical signal: resistive/voltage type; many systems present ~0.5–4.5 V across temperature range (cold-to-hot) — consult vehicle-specific data for exact values
  • Open-circuit result: very high resistance or no voltage/signal (near infinite Ω or 0 V)
  • Short-circuit to ground: near 0 V output; short to battery: near battery voltage on signal line
  • Heater circuit (if present): switched 12 V supply when active; expected current draw depends on heater design

Diagnostic algorithm

  1. Retrieve all DTCs and freeze-frame data. Note time/temp conditions when fault set.
  2. Monitor live reductant temperature signal while key ON and engine running (if required). Look for signal dropouts, jumps, or unrealistic values.
  3. Visually inspect sensor connector and harness for DEF crystals, corrosion, damage, or loose pins. Clean and reseal if contamination found.
  4. Perform wiggle test: with scan tool monitoring the reductant temp value, move harness and connector to try to recreate intermittent fault. If fault appears, isolate and repair wiring/connector.
  5. Backprobing: measure sensor signal voltage or resistance at the connector. Compare to expected vehicle-specific values and to temperature. For NTC: verify resistance changes with temperature (warm the sensor slightly and see resistance decrease).
  6. Check seed power and ground: verify reference supply (if present) and ground continuity from sensor harness to ECU. Check fuses/relays in the sensor/heater circuits.
  7. If sensor includes a heater, verify heater supply and measure current draw; check for open or intermittent heater circuit.
  8. If wiring and connectors test good, substitute a known-good sensor or bench-test sensor to confirm replacement need.
  9. Repair or replace faulty wiring, connectors, or sensor as required. Use dielectric grease where appropriate and prevent DEF ingress.
  10. Clear DTCs and perform functional test/drive cycle. Re-scan to ensure code does not return and system behaves normally.

Likely causes

  • Connector corrosion or water/DEF contamination causing intermittent contact
  • Damaged harness where it bends or routes near hot/sharp parts
  • Failed sensor element (NTC) developing intermittent resistance changes

Fault status

⚠️ Status
Reductant Temperature Sensor A Circuit Intermittent — intermittent/open/short or poor connection detected in reductant temperature sensor circuit.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5 - 2.0 hours

Similar codes

P2040 P2041 P2045 P2050 P20E5
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