P20B1 Possible Causes
- Faulty reductant heater coolant control valve
- Reductant heater coolant control valve circuit open or shorted
- Poor electrical connection in reductant heater coolant control valve circuit
What Does It Mean?
How to Fix Code P20B1
Check the “possible causes” listed above. Visually inspect related wiring harnesses and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
P20B1 Possible Symptoms
Illuminated engine light (or service engine soon warning light)
P20B1 Meaning
Reductant heater coolant control valve circuit/open is the generic description for code P20B1, but the manufacturer may have a different description