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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Common Symptoms
- Check Engine Light on intermittently
- DEF warning may appear and disappear
- SCR system intermittent faults
- Occasional engine power reduction
- CEL may reset and return
Probable Causes (Ranked by Likelihood)
- 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
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
Step-by-Step Diagnostic Procedure
-
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
Commonly Affected Vehicles
- 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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