Fix P2046: STEP-BY-STEP diagnostic GUIDE!

The P2046: Reductant Temperature Sensor Circuit Intermittent code indicates that the signal from the reductant (DEF/AdBlue) temperature sensor is unstable or intermittent. This issue can result from a faulty sensor, wiring issues, or problems with the sensor circuit.

P2046 – Quick Overview

CodeInformation
MeaningP2046: Reductant Temperature Sensor Circuit Intermittent
Is it serious?Yes, an intermittent sensor signal can lead to improper DEF system operation, affecting NOx reduction and leading to increased emissions.
Possible causes– Intermittent sensor signal
– Faulty sensor
– Wiring or connector issues
How to diagnose?– Monitor the sensor signal for intermittency
– Test the sensor
– Inspect wiring and connectors

P2046 Meaning

The P2046: Reductant Temperature Sensor Circuit Intermittent code indicates that the temperature sensor for the DEF system is providing an unstable or intermittent signal. This sensor is responsible for monitoring the temperature of the DEF fluid, which is critical for the proper function of the DEF injection system. If the signal from this sensor is unstable, it can disrupt the DEF system’s operation, leading to poor emissions control.

Step-by-step diagnostic guide

ActionDescriptionTools Needed
Check for Other CodesUse an OBD-II scanner to check for additional related codes. These may offer further insights into issues within the DEF system or emissions control system.OBD-II Scanner
Monitor the Sensor Signal for IntermittencyUse a diagnostic tool to monitor the signal from the reductant temperature sensor over time. Look for erratic or intermittent readings that could indicate a problem.Diagnostic Tool
Test the Reductant Temperature SensorUse a multimeter or diagnostic tool to test the sensor’s performance. Compare the readings to manufacturer specifications to determine if the sensor is faulty or unstable.Multimeter, Diagnostic Tool
Inspect Wiring and ConnectorsVisually inspect all wiring and connectors connected to the temperature sensor. Look for signs of damage, corrosion, or loose connections that could cause an intermittent signal.Flashlight, Multimeter
Check Circuit ContinuityPerform a continuity test on the wiring to ensure that there are no shorts, breaks, or high resistance that could lead to intermittent signals.Multimeter
Inspect the DEF SystemCheck the DEF system for any blockages, contamination, or malfunctions that could affect the temperature sensor’s performance. Make sure the DEF fluid is within the proper temperature range.Flashlight
Replace the Reductant Temperature SensorIf the sensor is faulty or providing an unstable signal, replace it with a new one. Ensure the new sensor is installed correctly to avoid future issues.Replacement Sensor, Wrench
Repair or Replace Damaged WiringRepair or replace any faulty wiring, connectors, or components to restore proper function and eliminate intermittent signals in the sensor circuit.Wiring Repair Kit
Clear the Code and Test DriveAfter completing repairs, clear the P2046 code using an OBD-II scanner. Test drive the vehicle to ensure the sensor signal is stable and the issue is resolved.OBD-II Scanner, Vehicle Owner’s Manual
Recheck for CodesAfter the test drive, re-scan the vehicle to verify that the P2046 code has been cleared and the sensor signal remains stable.OBD-II Scanner
Bluetooth OBD-II scanners

OBD-II scanner Buyer’s Guide

  • Scanner features explained
  • Different types of scanners
  • Scanners for coding/odometer/ECU/checks
  • Best picks + discount codes

Download PDF FREE

    Leave a Comment