P20B2
Reductant Heater Coolant Control Valve Performance/Stuck Open
P20B2 is an OBD-II diagnostic trouble code meaning: Reductant Heater Coolant Control Valve Performance/Stuck Open. Common causes: mechanical valve jamming, open or short circuit in control circuit. Estimated repair cost: $50–133.
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
Error P20B2 by Vehicle Brand
FAQ
What does the P20B2 code mean?
P20B2 is an OBD-II diagnostic trouble code that indicates: Reductant Heater Coolant Control Valve Performance/Stuck Open
What causes a P20B2 error code?
The most common causes of P20B2 include: Mechanical valve jamming; Open or short circuit in control circuit; Valve solenoid malfunction; Problems with the SCR control unit.
How do I fix a P20B2 diagnostic trouble code?
To fix P20B2: Check the condition of the valve and its electrical connections. Test the resistance of the electromagnet winding. Check voltage at valve connector. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P20B2?
Yes, but get it checked soon
How much does it cost to fix P20B2?
The estimated repair cost for P20B2 is $50–133. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat