P2046 Fault Code

Reductant Temperature Sensor Circuit Intermittent

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

The P2046 fault code pertains to an intermittent issue within the reductant temperature sensor circuit, which is crucial for measuring the temperature of the diesel exhaust fluid (DEF) in vehicles equipped with selective catalytic reduction (SCR) systems. This sensor plays a significant role in optimizing the performance of the emissions control system, ensuring the proper amount of DEF is injected into the exhaust stream to reduce harmful nitrogen oxides (NOx).

What are the symptoms of the P2046 code?

Symptoms associated with a P2046 fault code can include:

• Check Engine Light (CEL) illuminated on the dashboard
• Reduced engine performance upon acceleration
• Increased emissions output due to malfunctioning SCR system
• Diagnostic tools may show additional fault codes related to the emissions control system.

What causes the P2046 code?

Common causes for a P2046 code may include:

• Faulty reductant temperature sensor
• Damaged wiring or connectors in the sensor circuit
• Poor electrical connections, such as corrosion or loose connectors
• Issues with the engine control module (ECM) reading the sensor's input
• External temperature influences affecting sensor performance.

How to fix P2046?

To resolve a P2046 fault code, recommended steps include:

• Visually inspecting the reductant temperature sensor and its wiring for signs of damage or corrosion
• Testing the sensor for proper functionality and replacing it if defective
• Ensuring all electrical connections are clean and secure
• If no issues are found with the sensor or wiring, diagnosing the ECM for further potential issues.