P20B2

Reductant Heater Coolant Control Valve Performance/Stuck Open

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$50–133 (est.)

Symptoms

Check Engine Light Is On
Reduced engine power
Increased AdBlue urea consumption
Increased NOx emissions
SCR error message on dashboard

Causes

Mechanical valve jamming
Open or short circuit in control circuit
Valve solenoid malfunction
Problems with the SCR control unit
Valve contaminated or corroded

How to Fix

Check the condition of the valve and its electrical connections
Test the resistance of the electromagnet winding
Check voltage at valve connector
Clean or replace faulty valve
If necessary, reflash the SCR control unit

Related codes

P20B0 P20B1 P20B3