P2042

Reductant Temperature Sensor A Circuit

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$28–89 (est.)

Symptoms

Check Engine light comes on
Reduced engine power
Increased fuel consumption
Increased NOx emissions
SCR system error message on dashboard

Causes

Reagent temperature sensor malfunction
Open or short circuit in the sensor circuit
Poor contact in sensor connectors
Wiring harness damage
SCR control module malfunction

How to Fix

Check the continuity of the temperature sensor circuit
Check sensor connectors and contacts
Check sensor resistance at different temperatures
Replace reagent temperature sensor if necessary
Check the operation of the SCR control module

Related codes

P2043 P2044 P2045