Service

Technical Information

21/25

ENU

9318

Vehicle not ready, Red Warning Message "HV Vehicle Electrical System: Malfunction!” and Fault
Memory Entries regarding Pulse Inverter (21/25)

9

Change overview
Release

Date

Change

0

04/24/2025

•

First publication

1

11/10/2025

•
•

Fault memory entries for front pulse inverter supplemented
“Action Required” section suitably changed

2

01/16/2026

•

Software solution added

Model Line:

Macan (XAB)

Model Year:

As of 2024 up to 2026

Concerns:

Front high-voltage pulse inverter (JX4)
Rear high-voltage pulse inverter (JX1)

Cause:

The customer complains about a red warning message at start-up "HV vehicle electrical system:
Malfunction! Stop vehicle safely" in the instrument cluster.
Even after an ignition change (ending driving readiness and starting again), the vehicle is still not ready to
drive and displays the same warning message. If a bus rest of approx. 8 minutes is produced, the warning
message disappears when the vehicle is started and the vehicle is ready to drive again.
All of the following fault memory entries are stored in the fault memory of the front high-voltage pulse
inverter control unit (JX4) or the rear pulse inverter control unit (JX1) and these were entered simultaneously
(time stamp identical).
Front high-voltage pulse inverter (JX4):
•
•
•

P0C0C00 - Front high-voltage pulse inverter (JX4), phase generation, internal power supply, electrical
fault (01060B)
P0C0C00 - Front high-voltage pulse inverter (JX4), phase generation, internal power supply, electrical
fault (01063F)
P0E8D00 - Front high-voltage pulse inverter (JX4), front electric machine voltage sensor, electrical
fault (010688)

and/or
Rear high-voltage pulse inverter (JX1):
•
•

P0C0C00 - Rear high-voltage pulse inverter (JX1), phase generation, internal power supply, electrical
fault (01060B)
P0C0C00 - Rear high-voltage pulse inverter (JX1), phase generation, internal power supply, electrical
fault (01063F)

AfterSales

Jan 16, 2026
Page 1 of 2

9

Service
9318

ENU

•

Technical Information

21/25

P0E8D00 - Rear high-voltage pulse inverter (JX1), rear electric machine voltage sensor (VX90), electrical fault (010688)

Information
If the fault memory entries were not entered at the same time, this Technical Information (TI) does not apply.
Action:

⇒ If the vehicle is affected by Workshop Campaign WSJ0 and this has not yet been carried out. Carry out
WSJ0 workshop campaign: ⇒ Technical Information 'WSJ000 WSJ0 workshop campaign – Update to
software network VR28.13'
⇒ If Workshop Campaign WSJ0 has already been carried out in the past or the vehicle is not affected by
Workshop Campaign WSJ0.
Always perform a software integration test to ensure that all control units have the latest software release.
Create vehicle analysis log (VAL) and check the fault memory entries in the high-voltage rear pulse inverter
control unit and/or high-voltage front pulse inverter control unit.
If the described fault memories are entered more than once (fault frequency counter >1), the affected pulse
inverter must be replaced.
If the fault memories are entered only once, no action is required if the bus idle of approx. 8 minutes has
caused the fault pattern to heal.
The vehicle can continue to be used without further restrictions.

Important Notice: Technical Bulletins issued by Porsche Cars North America, Inc. are intended only for use by professional automotive technicians who have attended Porsche service training courses. They are
written to inform those technicians of conditions that may occur on some Porsche vehicles, or to provide information that could assist in the proper servicing of a vehicle. Porsche special tools may be necessary in
order to perform certain operations identified in these bulletins. Use of tools and procedures other than those Porsche recommends in these bulletins may be detrimental to the safe operation of your vehicle, and
may endanger the people working on it. Properly trained Porsche technicians have the equipment, tools, safety instructions, and know-how to do the job properly and safely. Part numbers listed in these bulletins
are for reference only. The work procedures updated electronically in the Porsche PIWIS diagnostic and testing device take precedence and, in the event of a discrepancy, the work procedures in the PIWIS Tester
are the ones that must be followed.

© 2026 Porsche Cars North America, Inc.

Jan 16, 2026
Page 2 of 2

AfterSales