Reductant Temperature Sensor Circuit Intermittent
The P2046 code means the vehicle's onboard diagnostic system has detected: Reductant Temperature Sensor Circuit Intermittent. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- moderate
- Estimated cost
- $150 - $500 (parts and labor)
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What Are the Symptoms of P2046?
- Check Engine Light on intermittently
- DEF warning may appear and disappear
- SCR system intermittent faults
- Occasional engine power reduction
- CEL may reset and return
What Causes P2046? (Most Likely First)
- Loose connector at DEF temperature sensor Very High
- Intermittent wiring break from vibration High
- Failing DEF temperature sensor Moderate
- Corroded pin connections Moderate
- PCM intermittent input fault Low
Can I Still Drive with P2046?
Short distances only. P2046 is rated moderate severity. Keep trips short and get it diagnosed soon rather than waiting for symptoms to worsen.
Frequently Asked Questions
What does P2046 mean?
P2046 indicates an intermittent fault in the DEF temperature sensor circuit, usually from a loose or corroded connection that causes the signal to fluctuate.
Can I drive with a P2046 code?
Short-distance driving is fine, but the intermittent fault may cause unpredictable SCR system behavior.
How much does it cost to fix P2046?
Repairs typically cost $150 to $500, often involving connector repair or wiring harness work.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose P2046?
-
Confirm P2046 and review freeze frame conditions
-
Wiggle-test DEF sensor connector while monitoring signal
-
Inspect connector pins for corrosion and proper tension
-
Check wiring routing for chafing or exposure to road spray
Sources 2
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
- Cross-checked against the SAE J2012:2002 DTC table (2026-08-27)archived scan of the SAE standard — readable copy, not SAE’s current edition
Which Vehicles Commonly Get P2046?
- 2011-2019 Chevrolet Silverado 2500 6.6L Duramax
- 2009-2015 Volkswagen Jetta 2.0L TDI
- 2012-2018 BMW 328d 2.0L Diesel
- 2010-2016 Mercedes-Benz ML350 3.0L BlueTEC
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