SCR again...a new code

[Rawze]

also check the screens at the DEF pump.

quickseerv says...

Possible causes of this fault code include:

Low aftertreatment diesel exhaust fluid level in the diesel exhaust fluid tank

Either high or low diesel exhaust fluid pressure.

The line heaters are not successfully thawing the frozen diesel exhaust fluid

The diesel exhaust fluid pressure line between the dosing unit and dosing valve is kinked, broken, or disconnected

The diesel exhaust fluid suction line between the diesel exhaust fluid tank and the dosing unit is kinked, broken, or disconnected

Malfunctioning diesel exhaust fluid dosing unit

The diesel exhaust fluid suction and return lines between the dosing unit and diesel exhaust fluid tank are reversed

Debris from the diesel exhaust fluid tank. If debris is found in the diesel exhaust fluid tank, clean the diesel exhaust fluid tank thoroughly and fill with certified diesel exhaust fluid.