What Does P2046 Mean?
The reductant temperature sensor signal is erratic or intermittently dropping out. This suggests a loose connection, intermittent short, or failing sensor.
Common Causes
40%
Loose, corroded, or intermittent connection at sensor connector
25%
Intermittently failing reductant temperature sensor
20%
Damaged or chafed wiring causing intermittent short or open
10%
Vibration-induced sensor mounting or connector issues
5%
Water intrusion into sensor or connector causing intermittent faults
Diagnostic Steps
1
Step 1: Wiggle test all connections at sensor and along harness while monitoring live data
2
Step 2: Inspect sensor connector for bent pins, corrosion, or loose terminal fit
3
Step 3: Check for water intrusion in DEF tank area and sensor housing
4
Step 4: Monitor sensor voltage/resistance during hot and cold cycles to identify thermal breakdown
5
Step 5: Verify sensor mounting is secure and not subject to excessive vibration
Estimated Repair Cost
$120 - $550
Parts + labor, varies by vehicle and location
The reductant temperature sensor signal is erratic or intermittently dropping out. This suggests a loose connection, intermittent short, or failing sensor.
The most common cause of P2046 (Reductant Temperature Sensor Circuit Intermittent) is: Loose, corroded, or intermittent connection at sensor connector
Typical repair costs for P2046 range from $120 to $550, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive but may cause intermittent power loss or limp mode. Continued operation may lead to SCR system inefficiency and emissions non-compliance.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2046 to identify the root cause.
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Quick Info
Category
Powertrain
System
Emissions Control - SCR System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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