Technical Service Bulletin (TSB)
Flash: Diesel Exhaust Fluid Control Unit (DCU) Updates
REFERENCE:

TSB: 08-076-26
GROUP: 08 - Electrical

Date:

February 21, 2026

REVISION: 08-084-25

VEHICLES
AFFECTED:

**2025 (DD) RAM 3500 Cab Chassis
MARKET APPLICABILITY:
2025 (DJ) RAM 2500 Pickup
MEA
NA
2025 (DP) RAM 4500 / 5500 Cab Chassis**
**SA**
IAP
2025 (D2) RAM 3500 Pickup
This bulletin applies to vehicles equipped with Selective Catalytic
EE
CH
Reduction (UREA) (Sales Code XAL) and a 6.7L I6 Cummins HO Turbo
NOTE: **This bulletin applies
Diesel Eng (Sales Code ETM).
to the North America
and South America
markets.**

CUSTOMER
SYMPTOM:

Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must
exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs):
● **P20BC-00 - Reductant Suction Line Heater Control Circuit High. - in Active or Stored status.
● P202C-00 - Reductant Tank Heater Control Circuit High. - in Active or Stored status.
● P20E8-00 - Reductant Pressure Too Low. - in Active or Stored status.
● P209F-00 - Reductant Tank Heater Control Circuit Performance. - in Active or Stored status.
● P208B-00 - Reductant Pump 1 Control Performance. - in Active or Stored status.**
● P218F-00 - Reductant No Flow Detected.
● P249E-00 - Closed Loop SCR Reductant Injection Control At Limit - Flow Too High.
**Customers may also comment one or more the following:
● "Service Diesel Exhaust Fluid (DEF) System See Dealer" message in the Electronic Vehicle Information
Center (EVIC).
NOTE: This message will appear after the DEF pump fails to build pressure, a fault is set and the
message continues to be displayed for 80 km (50 mi) of driving.
● "Speed Will Be Limited To 8 kph (5 mph)" message displayed in the EVIC.
CAUTION!
If the vehicle is not taken to the dealership BEFORE reaching 241 km (150 mi) from when the
"Service Diesel Exhaust Fluid (DEF) System See Dealer" message is displayed, the vehicles speed
will be limited to 8 kph (5 mph).**
● Reduced acceleration from turbo.

CAUSE:

DCU software

This bulletin supersedes Technical Service Bulletin (TSB) 08-084-25, date of issue March 22, 2025,
which should be removed from your files. All revisions are highlighted with **asterisks** and include
new models, a Market, Market Note, DTCs, Customer Symptoms, LOP and a Repair Procedure Note.
Revisions not highlighted with **asterisks** include removal of the build date and a Repair Procedure
step.
This Technical Service Bulletin (TSB) has also been released as a Rapid Service Update (RSU) 25-044,
date of issue March 22, 2025. All applicable RSU VINs have been loaded. To verify this RSU service
action is applicable to the vehicle, use VIP or perform a VIN search in DealerCONNECT/Service Library.
All repairs are reimbursable within the provisions of warranty.

M08 FSAR-TSB-6709

-2-

REPAIR SUMMARY:
This bulletin involves inspecting and possibly reprogramming the DCU with the latest available software.
CLAIMS DATA:

Labor Operation No:
18-19-18-9G

**18-19-18-9K

Failure Code

Labor Description
Unit, Def Control (DCU) Inspect
(0 - Introduction)
Unit, Def Control (DCU) Inspect and Reprogram
(0 - Introduction)
RF
CC

Skill Category
6 - Electrical and Body
Systems

Labor Time
0.2 Hrs.

6 - Electrical and Body
Systems

0.2 Hrs.**

Required Flash - RSU
Customer Concern

The dealer must choose which failure code to use depending on if this is a Rapid Service Update
(RSU) or Technical Service Bulletin.
● The “RF” failure code is required for essential module flash/reprogramming and can only be used after
confirmation that the VIN is included on the RSU.
● The failure code “RF” (Required Flash) can no longer be used on Technical Service Bulletin flashes. The
“RF” failure code must be used on an RSU.
● If the customer’s concern matches the SYMPTOM/CONDITION identified in the Technical Service Bulletin,
failure code CC is to be used. When utilizing this failure code, the 3C’s must be supplied.
DIAGNOSIS:
Using a Scan Tool (wiTECH) with the appropriate Diagnostic Procedures available in DealerCONNECT/
Service Library, verify all related systems are functioning as designed. If DTCs or symptom conditions, other
than the ones listed above are present, record the issues on the repair order and repair as necessary before
proceeding further with this bulletin.
If a customers VIN is listed in VIP or your RSU VIN list, perform the repair. If any vehicle not on the VIN list
exhibits any of the symptom listed above in the customer symptom section, perform the Repair Procedure.
SPECIAL TOOLS/EQUIPMENT:

Description
wiTECH or Equivalent

Ref. No.
-

Notes
-

-3-

M08 FSAR-TSB-6709

REPAIR PROCEDURE:
NOTE: Install a battery charger to ensure battery voltage does not drop below 13.2 volts. Do not allow
the charging voltage to climb above 13.5 volts during the flash process.
NOTE: If this flash process is interrupted/aborted, the flash should be restarted.
1. Is the vehicle on the RSU VIN list?
● YES >>> Proceed to Step 2.
● NO >>> Proceed to Step 3.
2. Does the DCU have the latest software already installed?
● YES >>> This bulletin has been completed, use Inspect LOP (18-19-18-9G) to close the active RSU.
● NO >>> Proceed to Step 3.
3. Reprogram the DCU with the latest available software. If issues arise when flashing a module using the
wiTECH Diagnostic Application, please submit a ticket to the Helpdesk. The helpdesk can be found within
the Help menu.
4. Clear all DTCs that may have been set in any module due to reprogramming. The wiTECH application will
automatically present all DTCs after the flash and allow them to be cleared.
NOTE: **For SA market only, after applying this TSB, it is not necessary to send DID-I or DID-A.**
POLICY:
Reimbursable within the provisions of the warranty.
This bulletin is supplied as technical information only and is not an authorization for repair. No part of this publication may be reproduced, stored in a retrieval system, or
transmitted, in any form or by any means, electronic, mechanical, photocopying, or otherwise, without written permission of FCA US LLC.