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

VEHICLES
AFFECTED:

CUSTOMER
SYMPTOM:

TSB: 08-031-23 REV. A
GROUP: 08 - Electrical

Date:

November 1, 2023

2022 (WL) Jeep Grand Cherokee
This bulletin applies to vehicles built on or before equipped with 2.0L I4
DOHC DI Turbo PHEV Engine (Sales Code ECX).

REVISION:

08-031-23

MARKET APPLICABILITY:

NA

IAP

EE

MEA

SA

CH

**Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation
the technician may find the following Diagnostic Trouble Code (DTC) has been set in the Hybrid Control
Processor (HCP) module:
• P16F0-00 - SPI Comm Hardware Fault.

Customer may experience one or more of the following:
• Unexpected engine start during a crank (customer is expecting EV mode but the gas engine starts).**
• “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.
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.
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.
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.
Verify the TCM and the PCM 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 TCM and the PCM software.
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.