P20AC

Reductant Metering Unit Temperature Sensor Circuit

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$28–89 (est.)

Symptoms

Check Engine Light Is On
Reduced engine power
Increased fuel consumption
Possible problems starting the engine
The SCR system may turn off

Causes

Reductant temperature sensor malfunction
Open or short circuit in the sensor circuit
Poor contact in the sensor connector
Wiring harness damage
Problems with the SCR control unit

How to Fix

Check the continuity of the temperature sensor circuit
Inspect connectors and contacts for corrosion or damage
Check the resistance of the temperature sensor
If necessary, replace the reductant temperature sensor
Reset the fault code and check the system

Related codes

P20A9 P20B0 P20B1