P2046 moderate

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.

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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

Step-by-Step Diagnostic Procedure

  1. Confirm P2046 and review freeze frame conditions

  2. Wiggle-test DEF sensor connector while monitoring signal

  3. Inspect connector pins for corrosion and proper tension

  4. Check wiring routing for chafing or exposure to road spray

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.

Sources

This page is built from documented references. Verify against your own service info before repair work.

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