S2118000006

Case Number: S2118000006
Release Date: May 2021
Symptom/Vehicle Issue: Malfunction Indicator Lamp (MIL) Illumination. Diagnostic
Trouble Code (DTC) P20C6 – Reductant Heater 4 Control Circuit, Set.
Discussion: A small number of customers may experience a MIL Illumination. Upon
further diagnosis, a technician may find DTC P20C6 set. This DTC may be more
prevalent in areas of extreme cold.
An analysis of several returned DEF pumps replaced for these DTCs have shown to be
Trouble Not Found (TNF). If you receive a vehicle with the above DTC, please perform
the following before replacing any parts.
1. Using wiTECH, observe the Environmental and Urea Tank Temperature parameters
in the PCM data. Verify that both temperatures are above 39°F (4°C) to help ensure
the DEF tank is thawed. If not, allow the vehicle to sit in a heated shop overnight
until the system can be fully thawed.
2. Thoroughly inspect the DEF supply line from the pump to the DEF injector, and
verify there are no leaks or blockages. Were any issues found with the DEF supply
line?
a. Yes>>> Repair the DEF supply line per normal published repair procedures.
No further action is required.
b. No>>> Proceed to (Step 3)
3. Check the DEF system for proper operation by performing the following steps:
This document does not authorize warranty repairs. This communication documents a record of past experiences. STAR Online
does not provide any conclusions about what is wrong with the vehicle. Rather, it captures all previous cases known that appear
to be similar or related to the vehicle symptom / condition. You are the expert, and you are responsible for deciding on the
appropriate course of action.
Contact STAR Center, or your Technical Assistance Center Via TechCONNECT or eCONTACT ticket if no
solution is found
FCA US LLC
Version 4.3 10/29/2020
a. Using wiTECH, perform a “DEF Dosing Injection Quantity” test in accordance
with published service information. During the initial stages of the routine, the
system will attempt to build pressure before beginning to dose. Did the routine
abort for failure to build pressure prior to dosing?
i. Yes>>> Replace the DEF pump in accordance to published service
information. No further action is required.
ii. No>>> Proceed to (Sub step b.)
b. Capture the amount of DEF injected during the routine in accordance with
service information. Is the amount of DEF captured during the routine between
26-35 ml?
i. Yes>>> System is operating as designed at this time. Do not replace
any parts. Engineering is currently investigating the root cause of false
failures of this DTC.
ii. No>>> Replace the DEF injector in accordance to service information
procedures. No further action is required.
This document does not authorize warranty repairs. This communication documents a record of past experiences. STAR Online
does not provide any conclusions about what is wrong with the vehicle. Rather, it captures all previous cases known that appear
to be similar or related to the vehicle symptom / condition. You are the expert, and you are responsible for deciding on the
appropriate course of action.
Contact STAR Center, or your Technical Assistance Center Via TechCONNECT or eCONTACT ticket if no
solution is found
FCA US LLC
Version 4.3 10/29/2020