Reductant Temperature Sensor Circuit Range/Performance
The P2043 code indicates that the reductant temperature sensor circuit in the selective catalytic reduction (SCR) system is reporting a signal that is out of the expected range or not performing correctly. This sensor monitors the temperature of the diesel exhaust fluid (DEF) to ensure proper injection into the exhaust stream. A fault can lead to incorrect DEF dosing, potentially causing increased emissions and triggering the check engine light.
01. Most Common Causes
- Faulty reductant temperature sensor
- Wiring or connector issues in the sensor circuit
- Open or short circuit in the sensor wiring
- Corrosion or damage to the sensor connector
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine performance or power
- Increased exhaust emissions
- Possible regeneration issues in the SCR system
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the P2043 code and check for any related codes.
Step 2: Visually inspect the reductant temperature sensor and its wiring for damage, corrosion, or loose connections.
Step 3: Test the sensor's resistance and voltage using a multimeter and compare to manufacturer specifications.
Step 4: If the sensor is faulty, replace it; if wiring issues are found, repair as necessary.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally not recommended to drive long distances with this code, as it can lead to improper DEF dosing and increased emissions, potentially causing damage to the SCR system or triggering limp mode.
How much does it cost to fix?▼
The cost to fix a P2043 code typically ranges from $50 to $150, including parts and labor, depending on the specific vehicle and whether the sensor or wiring needs replacement.