P2ACE

Reductant Temperature Sensor B Circuit Low

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 NOx emissions
SCR error message on dashboard
Increased consumption of AdBlue reagent

Causes

Reagent temperature sensor B fault
Open or short circuit in the sensor circuit
Poor contact in sensor connectors
Problems with the engine ECU
Corroded contacts or damaged wiring harness

How to Fix

Check the continuity of the temperature sensor circuit
Inspect connectors and contacts for corrosion
Check sensor resistance (compare with manufacturer specifications)
Replace reagent temperature sensor if necessary
Reset the error code and check if it returns

Related codes

P2ACF P2ACD P2A00