Hey everybody
Have a couple of ghg17 cascadias with Dd13s, throwing code 520372 fmi 16- Selective Catalyst Reduction Closed Loop Control at Maximum Limit. I have had some trucks in the past with this code and changing the def metering unit fixed it but there’s a couple that did not. On those I’ve also changed the def metering unit and both nox sensors, have done all modules software update for fuel map, def system cleaned. There’s a temporary fix of running scr efficiency tests back to back to get NH3 levels but up code will always be back. At a loss of what else it could be, any help appreciated
Dd13 def issue check engine
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by wtokhi, Sep 13, 2023.
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