The level sensor has three sensing elements. The level/temperature sensor gets power from the underhood electrical center and grounds through a chassis ground circuit. 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 2500 service def system see dealer 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
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#Ram 2500 service def system see dealer 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. I have no reservations about deleting my emissions and tuning it and only wish I did it sooner.Make and Model > Chevrolet > Express > Service Exhaust Fluid System… Service Exhaust Fluid System Message GM trucks Service Exhaust Fluid P203D P21AB or P21B0 I do blow a little smoke when I get on it, but it's not rolling coal. My highway mileage went from 14mpg to 19mpg at 80 mph. I installed a 150hp emissions delete tune and woke that Duramax engine up. I also disconnected the electronic connections for the EGR valve. I also added a lift pump to make sure that that the increased fuel volume is maintained to keep from draining the fuel rails and taking a chance of damaging the CP4 high pressure fuel pump. I decided to go for a delete tune by disconnecting my DEF pump, removing my DPF, but keeping my cat intact to keep it from droning and smelling like an old piece of mining equipment. I did run an EFI Live based emissions compliant tune, but it did nothing for my frequent regens or dismal mileage. I never had any DEF issues, but my refill warnings started to give me less and less mileage before it would go into limp mode. Yeah, you can tune it with the emissions intact, but you still have the DEF issues, regens, and crappy mileage.