Technical Service Bulletin (TSB)
Flash: Auxiliary Hybrid Control Processor
(AHCP) / Hybrid Control Processor (HCP) Updates
REFERENCE:

TSB: 08-042-26
GROUP: 08 - Electrical

Date:

February 5, 2026

VEHICLES
AFFECTED:

2025 (GG) Dodge Hornet
This bulletin applies to vehicles built on or before October 20, 2025
(MDH 1020XX) equipped with a 1.3L I4 DOHC Turbo PHEV Engine
(Sales Code EYG).

REVISION: 08-401-25

MARKET APPLICABILITY:
NA

MEA

SA

IAP

EE

CH

NOTE: This bulletin applies
to the North American
market.
CUSTOMER
SYMPTOM:

Customers may experience the following:
● **The vehicle is not performing a scheduled cabin preconditioning. 'Cabin Preconditioning Unavailable'
message present in the Instrment Panel Cluster (IPC) when the scheduled cabin condition is not performed
as planned.**

CAUSE:

**AHCP/HCP module software updates**

This bulletin supersedes Technical Service Bulletin (TSB) 08-401-25, date of issue December 12, 2025,
which should be removed from your files. All revisions are highlighted with **asterisks** and includes
an updated Customer Symptom, Cause, Repair Summary, Labor Description, Repair Procedure steps
and note, and new Repair Procedure notes.
REPAIR SUMMARY:
**This bulletin involves reprogramming the Auxiliary Hybrid Control Processor (AHCP) and Hybrid Control
Processor (HCP) with the latest available software.**
CLAIMS DATA:

Labor Operation No:
18-19-86-BM

Failure Code

Labor Description
**Processor, Auxiliary
Hybrid Control / Hybrid
Control (AHCP/HCP) Reprogram**
(0 - Introduction)
CC

Skill Category
1 - Engine Repair And
Performance

Labor Time
0.5 Hrs.

Customer Concern

The dealer must use failure code CC with this Technical Service Bulletin.
● If the customer’s concern matches the SYMPTOM identified in the Technical Service Bulletin, failure code
CC is to be used.
● When utilizing this failure code, the 3C’s (customer’s concern, cause and correction) must be provided for
processing Technical Service Bulletin flash/reprogramming conditions.

T08 FSAR-TSB-6860

-2-

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 the customer describes any of the symptoms listed above in the customer symptom section, perform the
Repair Procedure.
SPECIAL TOOLS/EQUIPMENT:

Description
wiTECH or Equivalent

Ref. No.
–

Notes
–

REPAIR PROCEDURE:
WARNING!
● Before performing the software reprogramming, it is necessary to make the vehicle safe.
● When performing repairs that directly involve or imply possible contact with live high voltage
components/systems, the technician must ensure that the power supply of the high-voltage system
is disconnected throughout the operation.
● Only specifically trained technicians qualified to perform repairs on vehicles with high voltage
systems under current national laws/regulations are authorized to work on the vehicle.
● Before performing any diagnostic repair work on the vehicle, carefully read and comply with
the general instructions for working safely on hybrid/electric vehicles and use suitable general
equipment and Personal Protective Equipment (PPE).
WARNING!
The vehicle must not be connected to a high voltage charger when performing software updates.
NOTE: **Install a 12v battery charger to ensure sufficient battery voltage is provided during the flash
process.**
NOTE: If this flash process is interrupted/aborted, the flash should be restarted.
CAUTION!
Removal of fuse F81 is necessary for this Repair Procedure. Failure to remove fuse F81 may result in
damage to the Brake Booster Vacuum Pump
1. **Remove the green 30 Amp fuse from cavity F81, for the Brake Booster Vacuum Pump from the Power
Distribution Center (PDC) located in the engine compartment.
2. Reprogram the AHCP with the latest available software first. If issues arise when flashing a module using
the wiTECH Diagnostic Application, please submit a ticket to the Help desk. The help desk can be found
within the Help menu.
CAUTION!
The AHCP must be flashed first prior to flashing the HCP. The AHCP will temporarily go offline
when flashed and will come back online once the HCP flash is completed. Do not continue with the
HCP flash if the AHCP flash has failed, has been interrupted, or was unsuccessful due to internet
failure or power loss. If failure occurs during the AHCP flash, please contact STAR.
3. Reprogram the HCP with the latest available software. If issues arise when flashing a module using the
wiTECH Diagnostic Application, please submit a ticket to the Help desk. The help desk can be found within
the Help menu.

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T08 FSAR-TSB-6860

4. Install fuse F81.**
5. 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.