P20B3

Reductant Heater Coolant Control Valve 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 fuel consumption
Possible problems with the SCR system
AdBlue error message on the dashboard

Causes

Open or short circuit in valve circuit
Coolant control valve malfunction
Relay or fuse problems
Corrosion of contacts or connectors
Control unit malfunction

How to Fix

Check the integrity of wiring and connectors
Check valve resistance
Check voltage at valve connector
Check the condition of fuses and relays
If necessary, replace the control valve

Related codes

P20B4 P20B2 P20B1