NHTSA ID Number: 10231811
Manufacturer Communication Number: 08-031-23
TSB/Document Date: 2023-02-13
Summary
Flash: Hybrid
Control Processor (HCP) and Auxiliary Hybrid Control Processor (AHCP) Updates Customers may experience one or more of the following: ?Service Charging System? popup when keying the vehicle to off while still in drive. Engine must be started twice to achieve drive ready (at low temperatures around -30°C, -22°F) when the vehicle was entered and started quickly. Radiator fan cycling while in park and with vehicle operational. May be described as ?breathing? sound from the front of the vehicle. ?Performance Limited, Service Fuel System? popup while driving. Radiator fan spinning at max speed while charging. The vehicle is providing max cooling when the charging module reaches high temperature. May be described as a loud sound that disappears when the vehicle is unplugged. Poor cabin heat in electric mode. Temporary loss of cabin cooling (<5s) while driving in electric mode. SOC dropping lower than expected while in eSave Battery Charge mode. Turtle mode while re-fueling in hot ambient. Unable to enter electric mode driving while FORM is active. This bulletin involves reprogramming the HCP and AHCP or also known as Power Inverter Module (PIM) with the latest available software. NOTE: Additional module flashes are required for this update to be effective, the following modules are all to be updated along with this HCP and AHCP update: Powertrain Control Module (PCM). Transmission Control Module (TCM).
Technical Service Bulletin (TSB)
Flash: Hybrid Control Processor (HCP) and Auxiliary Hybrid
Control Processor (AHCP) Updates
REFERENCE:
TSB: 08-031-23
GROUP 08 - Electrical
VEHICLES
AFFECTED:
2022 (WL) Jeep Grand Cherokee
This bulletin applies to vehicles equipped with a 2.0L I4 DOHC DI
Turbo PHEV Engine (Sales Code ECX).
Date:
January 27,
2023
REVISION: –
MARKET APPLICABILITY:
HNA
HMEA
HSA
HIAP
HEE
HCH
CUSTOMER
SYMPTOM:
Customers may experience one or more of the following:
• “Service Charging System” popup when keying the vehicle to off while still in drive.
• Engine must be started twice to achieve drive ready (at low temperatures around -30°C, -22°F)
when the vehicle was entered and started quickly.
• Radiator fan cycling while in park and with vehicle operational. May be described as “breathing”
sound from the front of the vehicle.
• “Performance Limited, Service Fuel System” popup while driving.
• Radiator fan spinning at max speed while charging. The vehicle is providing max cooling when the
charging module reaches high temperature. May be described as a loud sound that disappears
when the vehicle is unplugged.
• Poor cabin heat in electric mode.
• Temporary loss of cabin cooling ( Select Disable HV Battery
Contactors --> then follow the wiTECH prompts.
2. Using wiTECH confirm that the contactors are open and waiting five minutes. If the contactors do not
open turn the ignition on then off. Once successful a note will appear on the wiTECH screen indicating
the contactors are open.
3. Reprogram the HCP and AHCP with the latest software. Detailed instructions for flashing control
modules using the wiTECH Diagnostic Application are available by selecting the application’s
“HELP” tab.
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.
5. Verify the PCM and TCM are also programmed with the latest available software. Refer to all applicable
published service bulletins for detailed repair procedures and labor times regarding updating the PCM
and TCM software.
6. Enable HV battery contactors with wiTECH - Go to the Misc Functions tab --> Select Enable HV Battery
Contactors For Service--> then follow the wiTECH prompts.
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.
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TSB/Document ID: 08-031-23
Replacement Service Bulletin Number:
MFR Communication Date: 2023-01-27
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRICAL SYSTEM
MFR Component System:
MFR Component Subsystem:
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