P20B5 Possible Causes
- Faulty reductant measurement unit heater control
- Reductant measurement unit heater control harness is open or shorted
- Electrical connection of reductant measurement unit heater control circuit
What Does It Mean?
How to Fix Code P20B5
Check the “possible causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
P20B5 Possible Symptoms
Engine light on (or service engine soon warning light)
P20B5 Meaning
Reductant measurement unit heater control circuit/open is the generic description for code P20B5, but the manufacturer may have a different description.