Hi everyone. I have a 2020 RAM 3500 Laramie with a 6.7 diesel. the check engine light came on a few days ago and when I check the codes it came up with those two. I cleared the codes and they came back. Have any of you had these codes and if so, how did you resolve?
in looking at google searches it looks like it could be the DEF dosing control unit or wiring that goes to it, maybe? Any idea where the DEF dosing control unit is and how to test it to see if it's the issue?
thanks,
jeff in long beach.
from google searches:
Code: P1E1C
Definition: Reductant System Wake Up Circuit High
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:
Code: U040F
Definition: Invalid Data Received From Reductant Control Module
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:
in looking at google searches it looks like it could be the DEF dosing control unit or wiring that goes to it, maybe? Any idea where the DEF dosing control unit is and how to test it to see if it's the issue?
thanks,
jeff in long beach.
from google searches:
Code: P1E1C
Definition: Reductant System Wake Up Circuit High
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:
- DCU WAKE UP SIGNAL SHORTED TO VOLTAGE
- DCU WAKE UP SIGNAL OPEN/HIGH RESISTANCE
- DEF DOSING CONTROL UNIT
Code: U040F
Definition: Invalid Data Received From Reductant Control Module
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:
- DEF DOSING CONTROL UNIT CONNECTOR CORROSION OR FOREIGN MATERIAL
- INCORRECT J1939 DATALINK TERMINATION RESISTANCE
- DEF DOSING CONTROL UNIT
- POWERTRAIN CONTROL MODULE (PCM)