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.
- 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
Step-by-Step Diagnostic Procedure
-
Confirm P2044 with freeze frame data
-
Inspect DEF tank sensor connector for moisture and corrosion
-
Measure sensor signal voltage at the connector
-
Check for wiring shorts to ground
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.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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