P2043 Fault Code

Reductant Temperature Sensor Circuit Range/Performance

• What does that mean?
• Symptoms
• Causes
• Solutions

The P2043 fault code indicates an issue with the reductant temperature sensor circuit that may be affecting the performance of the vehicle's emissions control system. This sensor is crucial for measuring the temperature of the reductant fluid, which is used in selective catalytic reduction (SCR) systems to reduce nitrogen oxide (NOx) emissions. When the circuit is out of range or not performing correctly, it can lead to increased emissions and potential engine performance issues.

What are the symptoms of the P2043 code?

Symptoms associated with the P2043 code can include:

• Check Engine Light illuminated on the dashboard
• Poor engine performance or reduced power
• Increased emissions that may lead to failed emissions tests
• Possible performance-related warnings from the vehicle's onboard diagnostic system
• Erratic behavior of the SCR system

What causes the P2043 code?

The fault can be caused by a variety of factors, including:

• A faulty reductant temperature sensor
• Poor electrical connections or damaged wiring in the sensor circuit
• An issue with the vehicle's engine control module (ECM) processing sensor data
• Contamination or damage to the reductant itself
• Issues with the SCR system that affect sensor readings

How to fix P2043?

To resolve the P2043 fault code, consider the following steps:

1. Inspect the reductant temperature sensor and its wiring for any signs of damage or corrosion.
2. Test the sensor for proper operation and replace it if necessary.
3. Check the electrical connections to ensure they are secure and free of debris.
4. Inspect the SCR system and the quality of the reductant fluid being used.
5. Clear the fault code and conduct a test drive to verify that the issue has been resolved.