The reductant tank has a level/temperature sensor inside that tells the ECM the reductant level and temperature. Models Affected by PIP4887AĮquipped with 6.6L Duramax Diesel Engine RPO codes LML or LGH What the Service Exhaust Fluid P203D P21AB or P21B0 means A voltage within this range indicates a short to voltage.
RAM 5 MPH MAX SERVICE DEF SYSTEM SERIAL
The ECM receives a serial data message from the reductant sensor module that the emission reduction fluid tank level sensor 1, 2 or 3 voltage is greater than 4.74 V for greater than 3 s.
A voltage within this range indicates an open circuit, or The ECM receives a serial data message from the reductant sensor module that the emission reduction fluid tank level sensor 1, 2 or 3 voltage is between 3.56-4.74 V for greater than 3 s. P21B0 – Reductant Level Sensor 3 Circuit High Voltage. A voltage within this range indicates a short to ground. The ECM receives a serial data message from the reductant sensor module that the emission reduction fluid tank level sensor 1, 2 or 3 voltage is less than 0.17 V for greater than 3 s. P21AF – Reductant Level Sensor 3 Circuit Low Voltage. P21AB – Reductant Level Sensor 2 Circuit High Voltage. P21AA – Reductant Level Sensor 2 Circuit Low Voltage. P203D – Reductant Level Sensor 1 Circuit High Voltage. P203C – Reductant Level Sensor 1 Circuit Low Voltage. P203B – Reductant Level Sensor Performance, The ECM receives a serial data message from the reductant sensor module that the reductant level sensor indications are not plausible
RAM 5 MPH MAX SERVICE DEF SYSTEM MANUAL
If you see the “Service Exhaust Fluid System” and a “See Owner’s Manual Now” message displayed on the instrument cluster and scan the vehicle and find trouble codes P203D, P21AB, and P21B0, this bulletin may apply to you. GM has issued service bulletins #PIP4887A and #12-06-04-002E to address a Service Exhaust Fluid System Message and trouble codes P203D, P21AB, or P21B0 on the trucks listed below. Make and Model > Chevrolet > Express > Service Exhaust Fluid System… Service Exhaust Fluid System Message GM trucks Service Exhaust Fluid P203D P21AB or P21B0