This is the procedure and it has to be run exactly as stated. Also when it says above 55 it means above 55, not through town. Here in CA the technician would have to time the drive portion so the traffic on the freeway allowed the steady speed. It does say add new DEF, but if the DEF that was added is new it would be fine. Most likely they will charge warranty for new fluid so it isn't a big deal.
If the monitor does not run after doing the procedure it will most likely require the new cat, assuming they followed the procedure.
They can only re-run the procedure a couple of times before the PCM locks them out (see NOTE below for P241D) and then it requires a PCM replace. Warranty gets to spend another $800 for the technician not paying attention. And then that cost gets passed on to you and me down the road.
Diagnosis:
As part of the normal diagnosis for DTC P2BA9 - NOX Exceedence - Insufficient Reductant Quality, a
Diesel Exhaust Fluid (DEF) quality check must be performed. Refer to
DealerCONNECT>Service>TechCONNECT>Service Info>25 – Emission Control>Diesel Exhaust Fluid
Emissions>Diagnosis and Testing>DIAGNOSIS AND TESTING – DIESEL EXHAUST FLUID for
additional information. If contamination is found, the DEF tank will have to be completely drained and
cleaned.
Once the root cause of the P2BA9 has been determined, the monitor that set the P2BA9 will have to run
in order to clear out the “Service DEF” inducement message. The monitor for the P2BA9 will only run one
time after the system detects a DEF tank fill. In order for the monitor to detect a refill, perform the
following procedure. It will be necessary for the DEF tank to only contain approximately 2.5 gallons of
DEF before beginning this procedure.
NOTE: If DTC P241D - SCR Inducement – Forced Engine Shutdown is active and the engine
will not start, perform the “SCR Mileage Extend W Active Fault” wiTECH routing in
the Powertrain Control Module (PCM) “MISC Functions” menu tab.
NOTE: This procedure will not operate at temperatures below -700C (200
F).
Repair Procedure:
1. Turn the ignition on but do not start the vehicle.
2. Using the wiTECH diagnostic scan tool, clear the codes from the ECM.
3. If completely drained, fill the DEF tank with about 2.5 gallons of new DEF.
NOTE: Do not completely fill the DEF tank at this time.
4. Start the vehicle and allow it to warm up to normal operating temperature.
5. Using the wiTECH diagnostic scan tool, monitor the “Urea Reductant Pump Pressure” to verify
that the system is operational. Further diagnostics would be required if the DEF system is not
operational.
NOTE: The wiTECH diagnostic scan tool must be at software version 15.01 or later to
perform the following step.
6. Perform the “SCR DEF Tank Fluid Level Reset” procedure located in the PCM “System Test” tab
in wiTECH.
7. Turn the ignition off and allow the vehicle to sit for at least 5 minutes.
8. Add two gallons (or more) of new DEF.
9. Move the vehicle outdoors. Then, perform the “Service Diesel Particulate Filter Regeneration”
located in the PCM “Misc. Functions” tab in wiTECH.
10.Turn the ignition off and allow the vehicle to sit for at least 5 minutes.
NOTE: The final reset process will abort if the vehicle performs a passive regeneration
during the drive cycle. The wiTECH Service Regeneration procedure is to help
prevent a passive regeneration from occurring.
11.Drive the vehicle in a safe environment where a minimum of 89 kph (55 mph) can be maintained
for at least 30 minutes. Driving the vehicle at 89 kph (55 mph) for 30 minutes will allow the
diagnostic monitor for P2BA9 to run. If the DEF quality is sufficient and NOX reduction efficiency
is >60% during the drive cycle, the DEF quality diagnostics will pass and clear inducement
identified issues. The “Service DEF” message will then turn off.
Attention: TDR Forum Junkies 
