Diesel Exhaust Fluid (DEF) Level Gauge Inaccurate Or Stuck
This bulletin involves verifying the correct DEF level in the tank and if necessary, replacing
the DEF pump module.
A small number of customers may comment that their DEF level gauge is stuck for long
periods of time or is erratic. The customer may also experience a Malfunction Indicator
Lamp (MIL) illumination. Upon further investigation a technician may find one or more of
the following Diagnostic Trouble Codes (DTCs).
? P203B - Reductant Level Sensor Circuit Performance
? P203C - (Diesel Exhaust Fluid) Reductant Level Sensor Circuit Low.
? P203D - (Diesel Exhaust Fluid) Reductant Level Sensor Circuit High.
