P248B

Reductant Heater A Sense Circuit High

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$28–133 (est.)

Symptoms

Check Engine light comes on
Reduced engine power
Possible transition to emergency mode
Increased fuel consumption
Increased NOx emissions

Causes

Open or short circuit in the heater circuit
Reagent heating element malfunction
Problems with the wiring harness or connectors
SCR control module malfunction
Corrosion of contacts in the sensor circuit

How to Fix

Check the integrity of the heater circuit
Inspect connectors and wires for damage
Check the resistance of the heating element
Scan the SCR control module for errors
If necessary, replace the heating element

Related codes

P248A P248C P20EE