Condition

Customer statement:

The following red fault message is displayed in the instrument cluster when starting the vehicle: Drive system: fault. Park the vehicle safely.

Workshop findings:

The vehicle runs as it should after a bus sleep cycle. The following event memory entry is logged in the belt-driven starter-alternator control unit at the time of the complaint:

Postpone repair

Technical Background

This is a software issue in the belt-driven starter-alternator control unit (diagnostic address 00CC).

Production Solution

Expected in week 48/2025

Service

There is no reason to replace parts (belt-driven starter-alternator) as this could lead to repeat complaints.

The event memory entry must be ignored for the time being as it has no effect on the customer or the vehicle, aside from the message in the instrument cluster. This means that if the energy systems (after waiting for a bus sleep cycle to finish, for example) work again and the belt-driven starter-alternator charges the battery, the vehicle can initially be returned to the customer.

A software solution is currently under development and is not expected to be available before the end of Q3 2025.

Please postpone the repair with parts replacement until then as there is currently no effective repair for the complaint described by the customer.

If DISS is used in your market.

As part of the process, it is necessary that you activate the e-mail notification function in DISS for this TPI/this complaint. You will then automatically receive an e-mail from the DISS system as soon as new information for this complaint is available.

Proceed as follows:

Copy the TPI into the complaint in DISS.

When you do so, you will see a message indicating that a measure is being developed for the selected TPI and that you can receive an e-mail notification when the solution is available. These documents are for internal use only. If you would like to receive a notification, please select “Yes” for the query regarding the e-mail notification. Please note that you can only receive an e-mail notification if you have provided your e-mail address in the dealer portal.

Please do not close this complaint. If no measure is available before the archive date in 12 months, please extend the archive date. To do this, open the complaint in the DISS Monitor (order list → ‘Open archive candidates’ tab) and change the archive date to the maximum period using the calendar icon.

Warranty

There is no reason to replace parts. Unjustified work/replacement parts will be charged back. Invoicing under warranty is not permitted.

Service number/damage code: 2726 / 039

Billing in SAGA:

Billing in APOS NF: (If applicable)

Additional Information

A software issue in a sub-component of the power unit start system can trigger this warning in the instrument cluster under certain unfavourable and very sporadic operating conditions. This does not affect the vehicle operation.

All parts and service references provided in this TPI are subject to change and/or removal.

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