P2044 moderate

Reductant Temperature Sensor Circuit Low

The P2044 code means the vehicle's onboard diagnostic system has detected: Reductant Temperature Sensor Circuit Low. This is a moderate severity code.

My Garage →
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
  • DEF system warning
  • False low temperature reading may prevent DEF injection
  • SCR system malfunction
  • Possible speed limitation warning

Probable Causes (Ranked by Likelihood)

  • Short to ground in DEF temperature sensor circuit Very High
  • Failed DEF temperature sensor High
  • Water intrusion in DEF tank connector Moderate
  • Corroded wiring near DEF tank Moderate
  • PCM input fault Low

Frequently Asked Questions

What does P2044 mean?

P2044 indicates the DEF temperature sensor is reading below the minimum expected voltage, usually from a short to ground in the wiring or a failed sensor.

Can I drive with a P2044 code?

You can drive short distances, but the SCR system may be disabled. Some vehicles may start a speed limiter countdown.

How much does it cost to fix P2044?

Repairs typically cost $150 to $500, depending on whether the sensor, wiring, or DEF tank sender assembly needs replacement.

Mechanics Guide Step-by-step diagnosis

Step-by-Step Diagnostic Procedure

  1. Confirm P2044 with freeze frame data

  2. Inspect DEF tank sensor connector for moisture and corrosion

  3. Measure sensor signal voltage at the connector

  4. Check for wiring shorts to ground

Sources 1

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)

Commonly Affected Vehicles

  • 2011-2019 Ford F-250 6.7L Power Stroke
  • 2013-2020 Ram 2500 6.7L Cummins
  • 2011-2019 Chevrolet Silverado 2500 6.6L Duramax
  • 2009-2015 Volkswagen Jetta 2.0L TDI

Related Codes

P2042P2043P2045

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