2013 Hino 195 P20B2

andrewram

Rookie Expediter
Owner/Operator
Hey guys I have 2013 Hino 195 and the engine light just came on. Codes pulled are P204F and P20B2. Truck hasn’t gone into to limp mode yet. Any ideas on how to fix this?
 

greasytshirt

Moderator
Staff member
Mechanic
So for both cabovers and conventional trucks, when the def tank temp comes up, the coolant shutoff valve closes. If the temp continues to rise it's interpreted as the valve is stuck open. While this does happen occasionally, the def tank sending unit is usually the culprit. There's currently a warranty extension on these parts.
 
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