SA 16 DTC Explained =OBD / P-Codes
Heavy-duty truck fault codes do share similar results with the OBD automotive standard, but the heavy-duty manufacturers do things a little differently. This is why we recommend using good sources for your information so you havetheright information to fix your truck. Which trucks use OBD Fault codes?
- Volvo Trucks 2014+
- Mack trucks 2014+
- Prevost Bus 2014+
Here is look at some fault code data thatyou may have seen on your dashboard. The following information is on a 2015Volvo VNL 670 with a Volvo 500hp D13 engine with I-shift.
Fault #1:SA 16 DTC P113000
[SA] stands for SourceAddress. In this particular example, the “16” stands for the engine. So this fault code is coming from the Engine ECU. This can also be labeled as "SA 0" as well.
[DTC] stands for Diagnostic Trouble Code
[P] stands for Powertrain
[1130] stands for Aftertreatment Hydrocarbon Air Purge Valve
[00] stands for (stuck closed), this is the failure mode that sets this fault
Fault #2:SA 16 DTC P20EE00
[SA] stands for SourceAddress. In this particular example, the “16” stands for the engine. So this fault code is coming from the Engine ECU. This can also be labeled as "SA 0" as well.
[DTC] stands for Diagnostic Trouble Code
[P] stands for Powertrain
[20EE] stands for NOx Catalyst - Conversion Efficiency Low
[00] stands for (Below The Threshold), this is the failure mode that sets this fault
This OBD monitor is designed to determine the DEF efficiency as calculated by using the inputs of the commanded DEF and the two NOx sensors located upstream and downstream of the NOx Catalyst.
Take a look at the Inlet / Outlet NOx Sensor location and make sure they are not damaged. Good NOx sensorscan eliminate a lot of false positiveson the SCR system.
- Inlet NOx Sensor Location: Before your DOC/DPFsystem
- Outlet NOx Sensor Location: After your SCR system
A defective SCR operation can causethe dreaded "service def vehicle speed limited to 5 mph." If this happens you need to clear the SCR derate witha dealerlevel tool, or with OTR Diagnostics. The reset will remove the derate message off the instrument cluster and will allow you to drive past 5 mph. You can have NO ACTIVE CODES and still be deratedto 5MPH- keep this in mind if you run into this scenario. There is a special reset that getsrid of this message on your dash once you have fixed the DEF / SCR system.
So now you may be asking yourself, what is a good resource for checking fault codes?
We recommend truckfaults.com. This free software can be used by anyone who has internet service.Once you are on theTruckFaults application you just enter your fault codes in the searchbar and then learn in detail about the fault codes you have.
Untilnext time! 👋
Stay safe, stay healthy & be blessed.
