NHTSA ID Number: 11023016
Manufacturer Communication Number: WNH2
TSB/Document Date: 2025-09-09
Summary
Porsche
intranet posting with information on WNH2 - reprogramming DME control unit
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TSB/Document ID: WNH2
Replacement Service Bulletin Number:
MFR Communication Date: 2025-08-23
MFR Internal Campaign ID/Software Version: WNH2
Communication Type: Service Campaign
NHTSA Components: ENGINE
MFR Component System:
MFR Component Subsystem:
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WNH2 Workshop Campaign - Reprogramming DME control unit
WNH2 Workshop Campaign - Re-programming
DME control unit
ID Number
WNH2
Models
718 Cayman / Boxster (982)
Model Year
2017 - 2019
VIN List
Attached
Number of Affected VINs
16,580
Issue Description
Due to a software error in the DME control unit for the
affected vehicles, the market-specific requirements of
the OBD functions at extreme altitudes of more than
2,500m above sea level are not completely fulfilled.
For this reason, the DME control unit on the affected
vehicles must be re-programmed with an updated data record.
What should Porsche Centers do?
Please arrange for this measure to be carried out as
soon as possible on affected vehicles.
As of the time of this posting (08/22/2025), the repair is immediately available.
California PCs only
The Department of Motor Vehicles (DMV) in California
may require that the customer furnish proof of completion of this Workshop Campaign in the form of a
copy of the dealer's repair order, including a signed
"Proof of Correction" certificate, before the next renewal of the vehicle registration. You must supply this
documentation to the customer only after the campaign has been completed. Please instruct the customer to retain the signed "Proof of Correction Certificate" within their vehicle records.
Part Status
Status 0 - No parts needed
TI Number
No. 166-23
Required software
1
WNH2 Workshop Campaign - Re-programming DME control unit
PIWIS Tester 4 test software release
42.250.050 (or higher)
If other programming campaigns that affect the same control unit and involve
an identical procedure are open for a vehicle in addition to this campaign, the
affected control unit need only be programmed once using the current PIWIS
Tester test software.
Please proceed as follows for the campaigns that have not been carried out:
• Mark the campaign as 'cannot be carried out' with the reason
"Modification of the affected component" in PQIS. The "Warranty
relevance" flag must be activated in order to be able to set a warranty
claim and close the campaign.
• A warranty claim must be submitted for the campaign in which 0 time
units is entered as the specified labor time and no material items are
specified.
Warranty processing
Validity:
This workshop campaign will be carried out up to 01.11.2028 and will be closed by the specified date.
Please note that warranty claims can only be processed up to this date.
Scope 1:
Damage Code
WNH2 66 000
Repair Code
1
Labor time
39 TU
Please enter the performed campaign in the Warranty and Maintenance booklet for the vehicle.
Attachments
1. WNH2 Workshop Campaign VIN List Field Managers V3 08.22.2025 HT.xlsx
2
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