Service

Technical Information

66/22 ENU

2708

Vehicle Not Ready to Drive / Fault Memory Entry “Fuse for High-Voltage System” (P0A9500 /
P0E2F00) in High-Voltage Battery Control Unit - Observe Work Procedure (66/22)
Change
Overview:

2

Revision

Date

Change

0

11/05/2022

•

First publication

1

12/04/2023

•
•

Reference to “Questionnaire for TI 66/22” added
Component also to be replaced added (high-voltage distributor
booster)
“Action Required” section suitably changed
Section “Required parts, tools and materials” adapted
Section “Working position and PCSS encryption” adapted

•
•
•
2

04/13/2026

•
•
•
•

Requirement for PRMS ticket adjusted
“Action” section extended (fuse for high-voltage system may be
replaced once)
Work procedure revised
Checklist adapted

Model Year:

As of 2020 up to 2024

Model Line:

Taycan (Y1A / Y1B / Y1C)

Concerns:

High-voltage battery control unit (BMC)

Information:

Observe the required work procedure for the complaint “Vehicle not ready to drive” in connection with the
following fault memory entries relating to the fuse for the high-voltage system:
•
•
•

P0A9500 – Fuse for high-voltage system (140009)
P0E2F00 – Fuse 2 for high-voltage system (14000A)
P0E3000 – Fuse 3 for high-voltage system (14000B)

Action:
Information
The Taycan high-voltage battery has 3 fuses (4 fuses in certain equipment variants):
•

one front fuse for protecting the front high-voltage system (affecting all components running from the
high-voltage battery via the traction cable to the high-voltage booster),

•

one rear fuse for protecting the rear drivetrain,

•

one main fuse for protecting the high-voltage battery itself

•

and one pyro fuse that interrupts the power supply to the high-voltage system in the event of an
accident, boosts vehicle safety and protection against contact and prevents unintentional discharge of
the high-voltage battery.

AfterSales

Apr 13, 2026
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Service
2708

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Technical Information

66/22

If the front fuse has blown, it is most likely that this occurred during the charging process or (rather rare and
less likely) one of the components in the front vehicle area is the cause.
If the rear fuse has blown, this usually indicates a problem with the electric motor or power electronics. These
components should be checked when searching for the cause.
Information
A fuse is not tripped without reason. The source of the fault always needs to be identified and corrected in
order to prevent the fuse from being blown again.
Work procedure when a fuse is tripped:
•
•
•

Front fuse ‘P0A9500 – Fuse for high-voltage system (140009)’: ⇒ Technical Information 'Work
procedure when the front fuse is tripped'
Rear fuse ‘P0E2F00 – Fuse 2 for high-voltage system (14000A)’: ⇒ Technical Information 'Work
procedure when the rear fuse is tripped '
Main fuse ‘P0E3000 – Fuse 3 for high-voltage system (14000B)’: ⇒ Technical Information 'Work
procedure when the main fuse is tripped'

Work procedure when the front fuse is tripped
Work Procedure: 1

Ask the customer about the vehicle conditions when the fuse was tripped.
•
•
•

Was the vehicle being charged?
Was the vehicle being driven?
What was the vehicle doing when the fuse was tripped?

2

If the fuse was tripped during charging: Carefully complete the TI 66/22 questionnaire together with
the customer.
Can be found under the title “2708 - TI 66/22 questionnaire” in the information medium TI - Technical
Information, main group 2 - Fuel supply.

3

Perform an insulation measurement to determine whether other components were affected by the
reason why the fuse was tripped.

4

Replace identified defective components. Then – depending on the number of times the fuse was
tripped in the past – replace either only the E-box (fuse) or the entire high-voltage battery assembly
(high-voltage battery, high-voltage battery control unit, battery separator).
For the work procedure for replacing the E-box, see: ⇒ Workshop Manual 'Removing and installing
E-box'
and
⇒ Workshop Manual 'Replacing e-box'
For the work procedure for replacing the high-voltage battery assembly, see: ⇒ Workshop Manual
'270855 Replace the high-voltage battery'

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AfterSales

Service

Technical Information

66/22 ENU

2708

2

Information
For vehicles produced before 10/10/2023, the high-voltage distributor (booster) must be replaced as well.
This does not apply to vehicles for which the high-voltage distributor (booster) was already replaced after
10/10/2023.
For the work procedure, see: ⇒ Workshop Manual '279819 Remove and install high-voltage distributor
(booster)'
and
⇒ Workshop Manual '279855 Replacing high-voltage distributor (booster)'

Work procedure when the rear fuse is tripped
Work Procedure: 1

Ask the customer about the vehicle conditions when the fuse was tripped.
•
•

2

Was the vehicle being driven?
What was the vehicle doing when the fuse was tripped?

If the fuse was tripped while driving, check the rear power electronics and the electric machine.
•
•
•
•

Check all fault memory entries and rectify them using Guided Fault Finding.
Measuring diodes
Measuring capacitance
Measuring winding resistance

Information
Abnormal components that do not pass the measurements need to be replaced.
3

If the coolant circuit has overheated, check its function and flush it if necessary.
In addition, check the electric passenger compartment heater. Observe Technical Information (TI)
35/25 as well.
⇒ Technical Information '279855 Insufficient or imperceptible heating output in the passenger
compartment: Observe work procedure for fault diagnosis (35/25)'

4

Perform an insulation measurement to determine whether other components were affected by the
reason why the fuse was tripped.

5

Replace identified defective components and then replace the E-box (fuse).
For the work procedure, see: ⇒ Workshop Manual '279855 Removing and installing E-box'
and
⇒ Workshop Manual '279855 Replacing e-box'

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Technical Information

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Work procedure when the main fuse is tripped
Work
Procedure:

Information
The main fuse is usually tripped in conjunction with one of the other fuses. It is necessary to specifically
investigate which fuse has been tripped in combination:
•

For the work procedure when a fuse is tripped at the front, see: ⇒ Technical Information '279855 Work
procedure when the front fuse is tripped'

•

For the work procedure when the rear fuse is tripped, see: ⇒ Technical Information '279855 Work
procedure when the rear fuse is tripped '

•

Work procedure when the pyro fuse is tripped (depending on the respective vehicle equipment) and
other steps in the event of an accident ⇒ Individual Troubleshooting.

Required parts, tools and materials
Parts:

Required parts:
– Required parts if the high-voltage battery assembly needs to be replaced. –
Part No.

Designation
– Includes / application site

Number

9J1915100xx1

⇒ High-voltage battery complete (M No. J9K)
Includes:
– Battery disconnect element
– High-voltage battery control unit

1 piece(s)

⇒ High-voltage battery complete (M No. J9I)
Includes:
– Battery disconnect element
– High-voltage battery control unit

1 piece(s)

or
9J1915099xx1

1 Select the required high-voltage battery assembly using the Porsche Spare Parts Catalogue (PET).

– Required parts if the E-box (fuse) need to be replaced. –
Part No.

Designation
– Location of use

Number

2

⇒ Battery disconnect element (complete)

1 piece(s)

PAF009770

⇒ Internal hexagon round-head bolt, M6 x 32
– Battery disconnect element

9 piece(s)

2 Select the required battery separator (E-box) using the Porsche Spare Parts Catalogue (PET).

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AfterSales

Service

Technical Information

66/22 ENU

2708

2

– Required parts if the high-voltage distributor (booster) needs to be replaced. –
Part No.

Designation
– Location of use

Number

9J1915539DP

⇒ Voltage converter high-voltage booster low
– All-wheel drive (M No. 1X1)
– High-voltage booster low (M No. KM1)

1 piece(s)

⇒ Voltage converter high-voltage booster high
– All-wheel drive (M No. 1X1)
– High-voltage booster high (M No. KM2)

1 piece(s)

⇒ Voltage converter high-voltage booster low
– Rear wheel drive (M No. 1X2)
– High-voltage booster low (M No. KM1)

1 piece(s)

⇒ Voltage converter high-voltage booster high
– Rear wheel drive (M No. 1X2)
– High-voltage booster high (M No. KM2)

1 piece(s)

or
9J1915539DQ

or
99J1915539DM

or
9J1915539DN

Additional parts required for replacing the high-voltage distributor (booster)

Materials:

N 10261307

⇒ Hexagon nut, M10
Loosen wiper arm

2 units

PAF912040

⇒ Hexagon-head bolt, M5 x 50
(Dome) strut to spring strut mount

4 piece(s)

PAF106825

⇒ Cheese head bolt with multiple-tooth head M5 x 50
Strut to spring strut mount

4 piece(s)

N 10737001

⇒ Hexagon nut, self-locking, M6
Holder for electric passenger compartment heater on
body

3 units

Required materials (usually already available in the Porsche Center):
Part No.
00004330516

Tool:

•
•

Designation
⇒ Coolant additive, 20-liter / 5.28 gal container
– Cooling system

Quantity
As much as required
(approx. 1 liter / 33.8 fl
oz required per vehicle)

P90999 - PIWIS Tester 4
VAS 5908 - Battery charger, 90A

AfterSales

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2708

ENU

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Technical Information

66/22

VAS 6883A - Insulated tool set
VAS 6832/9 - Assembly tool
VAS 6832 - Master Gear unit elevating platform
P90012 - Guide pins
VAS 6884 - High-Voltage Cordon
VAS 6122 - Engine plug set
3093 - Hose clamp
VAS 531 011 - Cooling system service equipment
VAS 6675A - Funnel
T40262 - Locking cap
VAS 6410 - Contact surface cleaning set
VAS 6558/9-6A - High-voltage test adapter
VAS 6558A - High-voltage testing module
VAS 6935 - Pole terminal puller
VAS 6890 - Spring band clamp pliers
VAS 6558A/27 - Set of Kelvin clamps and test probes
VAS 681 003A - High-voltage battery charger
VAS 6096/2 - Vacuum pump

Labor position and PCSS encryption
Labor position:
APOS

Labor operation

03350050

On-board diagnosis

03350053

On-board diagnosis

27089590

High-voltage battery troubleshooting

27080162

Checking high-voltage battery

27758359

Deactivating and activating high-voltage system

19381756

Draining and filling coolant

27985500

Replacing high-voltage distributor (booster)

27085500

Replacing high-voltage battery

27085555

Replacing high-voltage battery (E-box)

27081900

Removing and installing high-voltage battery

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I No.

AfterSales

Service

Technical Information

66/22 ENU

2708

2

PCSS encryption:
Location (FES5)

27080

High-voltage battery

Damage type (SA4)

1611

non-functional

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.

© Porsche Cars North America, Inc.

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