2023-2024 Stellantis PHEV ECU Software Alignment TSB 08-110-25

What is this TSB about?

Technical Service Bulletin (TSB) 08-110-25 from Stellantis addresses the critical need for proper software management when replacing Electronic Control Units (ECUs) in certain 2023-2024 Plug-in Hybrid Electric Vehicle (PHEV) models. The TSB highlights that "multiple module software choices available" can lead to "possible error and module software misalignment" if not handled correctly during service. This bulletin is designated as "Information Only" and does not describe any customer-reported symptoms, but rather provides crucial technical guidance for maintaining the correct Stellantis PHEV ECU software alignment after a module replacement.

Why this TSB is Important

This TSB is vital for ensuring the correct operation of propulsion-related ECUs, including the Powertrain Control Module (PCM), Transmission Control Module (TCM), Hybrid Control Module (HCP), Auxiliary Hybrid Control Processor (AHCP), Auxiliary Power Module (APM), Integrated Dual Charging Module (IDCM), and Battery Pack Control Module (BPCM). When any of these ECUs are replaced, their software must be updated to precisely match the other software components in the vehicle. Proper Stellantis PHEV ECU software alignment is essential to prevent operational issues and maintain vehicle performance and safety.

Important Warnings for Owners and Technicians

Stellantis has issued critical warnings regarding the use of this bulletin and ECU software updates:

• Existing ECU Software: The software data provided in the tables within this TSB is strictly for use when replacing a pre-existing component with a new one. It "Under no circumstances should they be used as a reference to update existing ECU SW in the vehicle." For updating existing software, technicians must refer to specific technical bulletins or campaigns.
• Unauthorized Updates: "Any unauthorized update of the control unit software and improper use of this bulletin that causes a malfunction of the vehicle will be charged to the workshop responsible for the action and will not be subject to compensation by Stellantis." This emphasizes the importance of following official procedures to maintain Stellantis PHEV ECU software alignment.

ECU Software Alignment Procedure

When replacing a propulsion-related ECU, technicians must follow a specific procedure to ensure correct software alignment:

1. Pre-Replacement Scan: If possible, perform a Vehicle Scan Report before replacing the ECU. This captures the software version currently installed.
2. Post-Replacement Update: After replacing the ECU, update it with the software version previously installed on the vehicle, using the data from the tables provided in this TSB.
3. No Communication Scenario: If the newly replaced ECU does not communicate with the wiTECH diagnostic tool, technicians should refer to the TSB's tables. These tables help identify the correct software based on the other ECUs in the vehicle. For example, if the HCP has software 686557023AC and the AHCP has software 68657025AC, then the PCM will require software 68644638AB.
4. Programming Order: A specific ECU programming order must be followed:
   • Flash the Auxiliary Hybrid Control Processor (AHCP) first.
   • Then flash the Hybrid Control Module (HCP).
   • Finally, proceed with flashing any other remaining ECUs.

Required Tools and Software Part Numbers

The primary diagnostic tool mentioned for this procedure is the wiTECH system. The TSB includes extensive tables listing specific software part numbers for various ECUs, categorized by model, model year, and engine configuration (e.g., 190HP, 240HP). These part numbers are crucial for achieving proper Stellantis PHEV ECU software alignment. Examples of software part numbers referenced include 68580455A, 68602283A, 68637192A, 68636383A, 68529838A, 68484317A, 05185081A, X060C1V0, M0143918, and 3F50_95_0. These tables guide technicians in selecting the precise software for each module (PCR, HCP, AHCP, PCM, TCM, BPCM, IDCM, MCPB, APM) to ensure compatibility across the vehicle's electronic systems.

NHTSA ID: 10260460