Reductant Temperature Sensor Circuit Low
The P2044 code indicates that the reductant temperature sensor circuit in the selective catalytic reduction (SCR) system is reporting a voltage lower than the expected range. This sensor monitors the temperature of the diesel exhaust fluid (DEF) to ensure proper injection and system operation. A low circuit condition can be caused by a faulty sensor, wiring issues, or a short to ground, potentially leading to incorrect DEF dosing and increased emissions.
01. Most Common Causes
- Faulty reductant temperature sensor
- Short to ground in sensor circuit
- Open or damaged wiring/connector
- Corrosion or poor electrical connection
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine performance or limp mode
- Increased diesel exhaust fluid consumption
- Failed emissions test
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and record freeze frame data.
Step 2: Visually inspect the reductant temperature sensor and its wiring for damage, corrosion, or loose connections.
Step 3: Using a multimeter, check sensor resistance and compare to manufacturer specifications.
Step 4: Test the sensor circuit for shorts to ground or open circuits by disconnecting the sensor and checking continuity.
Step 5: If sensor and wiring are okay, replace the reductant temperature sensor.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive for extended periods as it can cause reduced engine performance, increased emissions, and potential damage to the SCR system. Limp mode may activate.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for parts and labor, depending on the vehicle and shop rates.