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Technical Service Bulletin Transaction No.: 2079998/3

35 Gearbox: drive system fault in instrument cluster, DTC P071100 symptom 20756 -

. : Rel date: Dec 18, 2025
diagnostic address 0002 clease care, See

Condition

Model(s) Year(s) VIN Range Vehicle Specific Equipment

Ad, S5 (FU), Q5, Q5
Sportback e-tron, SQ5, SQ5 | 2025-2026 All Not applicable
Sportback e-tron (GU)

REVISION HISTORY

Revision | Date Purpose

3 - Revised header (Added Model Year)
Revised Warranty (Updated Labor Operations)

2 11/10/2025 | Revised Condition (Corrected instructions)
1 11/10/2025 | Initial publication
Customer states:

* The drive system fault warning lamp lights up in the dash panel insert.
and/or
« There is no direct customer complaint.

* The event memory entry specified in the workshop findings is found in gearbox electronics control unit J217 in
connection with a different complaint.

Workshop findings:

The following event memory entry (static/intermittent) is logged in the gearbox electronics control unit (diagnostic
address 0002):

* P071100: “Transmission Fluid Temperature Sensor "A" Circuit Range/Performance” with symptom 20756
and subsequent entry
* P270800: “Solenoid Valve 6 is sticking on” with symptom 20859

* The customer only complained about a warning lamp lighting up.

Technical Background
Not applicable.

Production Solution
Optimized software.

Service

This bulletin replaces PSS TSB 2078847, 35 PSS Gearbox: Drive system fault in instrument cluster, DTC P071100
symptom 20756 - diagnostic address 0002.

Please check whether TSB 2079690, 00 Combined software update 03.10.00/C (28.13.01) KD2 is visible for this
vehicle. If this is the case, please perform the software update described in TSB 2079690.

Note:

Try to reproduce the customer complaint (based on the description/cause of the issue), so that it can be clearly
assigned to this TSB. The following repair must only be carried out if all the criteria (model/type, chassis number,
engine/motor and gearbox code, PR number(s), part number, software version, code etc.) apply exactly. Otherwise,
this solution will not eliminate the problem and repeat repairs may be necessary. In such a case, we may reject the
warranty claim.

Warranty
Claim Type: * — If the vehicle is outside of any warranty, this Technical Service Bulletin is
informational only.
Service Number: 3730
Damage Code: KDO02
Labor Operations: Software update, including connecting battery 01510010 |See SRT with
charger associated
operations
Fixed rate for software update, including all 01510040 |130 TU
required preliminary and follow-up work (including
bus sleep cycle, calibration drives, and additional
work)
In the case of additional attempts, an additional 01509999 |50TU
lump sum of 50 time units is possible per flash
: Per each
cancellation.
documented attempt
Claim Comment: As per TSB 2079998/3

All warranty claims submitted for payment must be in accordance with the Audi Warranty Policies and Procedures
Manual. Claims are subject to review or audit by Audi Warranty.

When performing the combined software update, time stamps are not required for billing under warranty. You are
therefore permitted to work on other vehicles at the same time. The combined software update can also be
performed by non-productive personnel.

Additional Information

The engine control unit software must be updated on this vehicle. Inform the customer about the software update
and ask them whether the engine control unit has been altered by chip tuning. Explain to the customer that updating
the engine control unit software renders the chip tuning ineffective. In certain circumstances, the engine control unit
may even be damaged by the software update. Ask the customer to clarify with the tuning company in advance
whether a software update is possible. Damage to the engine control unit resulting from chip tuning cannot be billed
to AUDI AG under warranty. Please refer the customer to the Warranty and Maintenance booklet to learn more
about how chip tuning can impact warranty coverage. Explain to the customer that neither AUDI AG nor your
company can be held responsible for damage caused by the software update or for damage that occurs as the
result of not having the update performed. Make a note to this effect on the order before it is signed by the customer.
Include this information in the customer file.

All part and service references provided in this TSB (2079998) are subject to change and/or removal. Always check
with your Parts Department and/or ETKA for the latest information and parts bulletins. Please check the Repair
Manual for fasteners, bolts, nuts, and screws that require replacement during the repair.

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