DTC P1831 GMC
Lost Communication With Diesel Exhaust Fluid Control Unit
Lost Communication With Diesel Exhaust Fluid Control Unit
Description
The Diesel Exhaust Fluid (DEF) Dosing Control Unit is used to control the operation and monitoring of the Diesel Exhaust Fluid system. The DEF Dosing Control Unit is the central control for the aftertreatment diesel exhaust fluid dosing system, and handles the tank level sensing, tank temperature sensing, line heating, and tank heating. The DEF Dosing Control Unit shares information with the Powertrain Control Module (PCM) over the J1939 Data Link. The PCM will illuminate the MIL light after the diagnostics runs and fails for two consecutive trips. The PCM will turn off the MIL light when the monitor runs and passes in three consecutive key cycles.
Cause and Solution
DEF DOSING CONTROL UNIT CONNECTOR CORROSION OR FOREIGN MATERIALFUSED BATTERY SUPPLY CIRCUIT OPEN HIGH RESISTANCEDEF DOSING CONTROL UNIT GROUND CIRCUIT OPEN HIGH RESISTANCEDCU WAKE-UP SIGNAL CIRCUIT OPEN HIGH RESISTANCEJ1939 DATALINK plus CIRCUIT OPEN HIGH RESISTANCEJ1939 DATALINK (-) CIRCUIT OPEN HIGH RESISTANCEJ1939 DATALINK plus CIRCUIT SHORTED TO BATTERY OR GROUNDJ1939 DATALINK (-) CIRCUIT SHORTED TO BATTERY OR GROUNDJ1939 DATALINK plus CIRCUIT SHORTED TO ANOTHER CIRCUITJ1939 DATALINK (-) CIRCUIT SHORTED TO ANOTHER CIRCUITJ1939 DATALINK COMPONENT INTERNALLY SHORTEDDEF DOSING CONTROL UNITPOWERTRAIN CONTROL MODULE (PCM)
Video Guide
Diagnostic Info
- DTC Code: P1831
- Brand: GMC