The P2042 trouble code indicates an issue with the reductant temperature sensor circuit.
P2042 Reductant Temperature Sensor Circuit
Code symptoms P2042.
1. Malfunction indicator lamp (MIL) or Check Engine Light (CEL) illuminated.
2. Changes in exhaust emissions.
3. Reduction in fuel efficiency.
4. Decrease in engine performance.
This code is common in brands such as:: Chevrolet, Renault, Ford, Toyota, Nissan, Mercedes Benz, Honda.
Causes of the code P2042.
1. Faulty reductant temperature sensor.
2. Wiring or connector issues in the sensor circuit.
3. Corrosion or contamination in sensor connectors.
4. Sensor circuit short to power or ground.
Code Solutions P2042.
1. Inspect the reductant temperature sensor and replace if faulty.
2. Check the wiring and connectors in the sensor circuit for damage, corrosion, or loose connections. Repair or replace as necessary.
3. Clean or replace sensor connectors if they are corroded or contaminated.
4. Test for sensor circuit short to power or ground and repair as needed.