Reductant Temperature Sensor Circuit Intermittent
P2046 indicates an intermittent circuit fault in the NOx sensor or SCR system component, potentially causing emissions and performance issues. Addressing this promptly prevents catalyst damage and maintains fuel efficiency.
What You Might Notice
- Reduced fuel efficiency
- Excessive black smoke from exhaust
- Diminished engine performance
- Check engine light illuminated
- Other SCR-related codes present
Most Common Causes
- 1
Defective reductant temperature sensor
Faulty or failing temperature sensor in the SCR system causing intermittent signal loss.
- 2
Corroded or loose electrical connectors
Oxidized or improperly seated connectors breaking circuit continuity intermittently.
- 3
Damaged wiring harness
Frayed, pinched, or corroded wiring causing sporadic signal interruptions.
- 4
Failed SCR control module
Defective engine control module or SCR processor losing intermittent communication.
How to Diagnose It
- 1
Check Defective reductant temperature sensor — Faulty or failing temperature sensor in the SCR system causing intermittent signal loss.
- 2
Check Corroded or loose electrical connectors — Oxidized or improperly seated connectors breaking circuit continuity intermittently.
- 3
Check Damaged wiring harness — Frayed, pinched, or corroded wiring causing sporadic signal interruptions.
- 4
Check Failed SCR control module — Defective engine control module or SCR processor losing intermittent communication.
How to Fix It
- 1
Inspect and clean electrical connectors
Clean corroded connectors and ensure proper seating to restore reliable circuit continuity.
- 2
Replace reductant temperature sensor
Install new temperature sensor to restore stable SCR system signal communication.
- 3
Repair or replace wiring harness
Replace damaged sections of wiring to eliminate intermittent circuit faults.
- 4
Replace SCR control module
Install new control module if electrical checks pass but fault persists.
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