Technical Service Bulletin (TSB)
Flash: Powertrain Control Module (PCM) Updates
REFERENCE:

TSB: 18-021-25 REV. B
GROUP: 18 - Vehicle Performance

Date:

October 8, 2025

VEHICLES
AFFECTED:

2025 (D2) RAM 3500 Pickup
This bulletin applies to vehicles equipped with a 6.7L I6 Cummins HO
Turbo Diesel Engine (Sales Code ETM) **and a 8-SPD Torque Flite HD
Auto Trans (Sales Code DFM)**.

REVISION: 18-021-25 REV. A

MARKET APPLICABILITY:
NA

MEA

SA

IAP

EE

CH

NOTE: **The bulletin applies
to the North 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):
● P0087-00 - Fuel Rail Pressure Too Low.
● P2540-00 - Low Pressure Fuel System Sensor Circuit Range/performance.
● P2543-00 - Low Pressure Fuel System Sensor Circuit Intermittent.
● P214D-00 - SCR NOX Catalyst Outlet Temperature Too High During Particulate Filter Regeneration.
● P242B-00 - Exhaust Gas Temperature Sensor Circuit Performance - Bank 1 Sensor 3.
● P24DA-00 - Particulate Matter Sensor Exhaust Sample Error Bank 1.
● P20EE-00 - SCR Nox Catalyst Efficiency Below Threshold - Bank 1 Catalyst 1.
● P226C-00 - Turbocharger Boost Control "A" Slow Response.
● P2281-00 - Air Leak Between MAF And Throttle Body.
● P229F-00 - NOX Sensor Circuit Range/performance - Bank 1.
● P0100-00 - Mass Or Volume Air Flow Sensor "A" Circuit.
● P203F-00 - Reductant Level Too Low.
● P0423-00 - Heated Catalyst Efficiency Below Threshold Bank 1.
● P0263-00 - Cylinder 1 Contribution-Balance.
● P0266-00 - Cylinder 2 Contribution-Balance.
● P0269-00 - Cylinder 3 Contribution-Balance.
● P0272-00 - Cylinder 4 Contribution-Balance.
● P0275-00 - Cylinder 5 Contribution-Balance.
● P0278-00 - Cylinder 6 Contribution/Balance.
● P026B-00 - Injection Timing Performance.
● P020A-00 - Cylinder 1 Injection Timing.
● P020B-00 - Cylinder 2 Injection Timing.
● P020C-00 - Cylinder 3 Injection Timing.
● P020D-00 - Cylinder 4 Injection Timing.
● P020E-00 - Cylinder 5 Injection Timing.
● P020F-00 - Cylinder 6 Injection Timing.
● P06B9-00 - Cylinder 1 Glow Plug Circuit Performance.
● P06BA-00 - Cylinder 2 Glow Plug Circuit Performance.
● P06BB-00 - Cylinder 3 Glow Plug Circuit Performance.
● P06BC-00 - Cylinder 4 Glow Plug Circuit Performance.

M18 FSAR-TSB-6251

-2-

● P06BD-00 - Cylinder 5 Glow Plug Circuit Performance.
● P06BE-00 - Cylinder 6 Glow Plug Circuit Performance.
Customers may also comment on one or more of the following:
● **Inverter drops out when shifting from P to D gears.
● Diesel Exhaust Fluid (DEF) level gauge slow to update after a refill.
● Poor cold start performance.**
● Cruise control drops out/cancels on its own.
● Engine stumble, runs rough, or a slight lack of power.
The following software enhancements are also available:
● **Improved troubleshooting and repair accuracy for air handling components through APT test in WiTECH.
**
● Reduce the occurrence of false faults Diagnostic Trouble Codes (DTCs) P0300-00 and P0315-00.
● DTC P1451-00 re-tune to reduce false faults.
● Improvements to allow DTC P2509-00 faults to be cleared with wiTECH.
● Adaptive Cruise Control (ACC) software fix to prevent cruise control dropouts.
● Engine stumble fix for improved drivability.
● Engine stall detection allowing DTC P032F-00 to clear after a power cycle.
● Allow multiple PROXI rewrites.
● Enable cold re-prime (DTC P208B-00 improvement).
CAUSE:

PCM software

This bulletin supersedes Technical Service Bulletin (TSB) 18-021-25 REV. A, date of issue May 14,
2025, which should be removed from your files. All revisions are highlighted with **asterisks** and
include updated Customer Symptoms, software enhancement, LOPs, additional Sales Code, Market
Note and removal of a build date not highlighted with asterisks.
This Technical Service Bulletin (TSB) has also been released as a Rapid Service Update (RSU) 25-094,
date of issue May 14, 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.
REPAIR SUMMARY:
This bulletin involves inspecting and possibly reprogramming the Engine Control Module (ECM/PCM) with the
latest available software.
CLAIMS DATA:

Labor Operation No:
**18-19-04-P6**

**18-19-04-P5

Labor Description
Module, Engine Control
(ECM) - Inspect Software
Level
(0 - Introduction)
Module, Engine Control
(ECM) - Inspect and
Reprogram
(0 - Introduction)

Skill Category
10 - Diesel

Labor Time
0.2 Hrs.

10 - Diesel

0.3 Hrs.**

-3Labor Operation No:
Failure Code

Labor Description
RF
CC

M18 FSAR-TSB-6251
Skill Category
Required Flash - RSU
Customer Concern

Labor Time

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
–

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. Is the ECM/PCM updated to the latest software level?
● YES >>> This bulletin is complete. Use Inspect LOP **(18-19-04-P6)** to close this active RSU.
● NO >>> Proceed to Step 3.
3. Reprogram the ECM/PCM with the latest 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 any DTCs that may have been set in any modules due to reprogramming. The wiTECH application
will automatically present all DTCs after the flash and allow them to be cleared.

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.