TSB: Replacing Electric Passenger Compartment Heater (WPL8) - October 5, 2023

[Tooney]

As of 2020 up to 2023:
Concerns: Electric passenger compartment heater

Cause: Due to a potential material error, the heater coating in the electric passenger compartment
heater can become detached on the affected vehicles during prolonged utilization of the heating and with high heating output, especially in countries with frequently cold environmental conditions.
This may result in the heating function being impaired and the vehicle not defrosting properly when
driving.

Action: Replace electric passenger compartment heater.

Affected Vehicles: Only vehicles assigned to the campaign (see also PCSS Vehicle Information).

If necessary, a data reconciliation from the vehicle analysis log (VAL) can be used to check whether the
correct electric passenger compartment heater has already been installed.
To do this, perform a reconciliation of the date of manufacture of the passenger compartment heater
installed in the vehicle in the PCSS and function “Comparison of diagnostic data (FAP)” with the currently
uploaded vehicle analysis log (FAP).
• If the date of manufacture is later than February 14, 2023 (manufacture > 14.02.2023), an
optimized component has already been installed on this vehicle. Reconciliation of manufacturing
date for high-voltage heater (FAP). In this case, it is not necessary to replace the electric passenger
compartment heater again.
• If the date of manufacture is before February 14, 2023 (date of manufacture < 14.02.2023), the
electric passenger compartment heater must be replaced.

https://static.nhtsa.gov/odi/tsbs/2023/MC-10244983-0001.pdf
Edit on Dec. 27 2023: revised TSB: https://static.nhtsa.gov/odi/tsbs/2023/MC-10246451-0001.pdf
Edit on May 10, 2024: revised TSB: https://static.nhtsa.gov/odi/tsbs/2024/MC-10253972-0001.pdf
Edit on May 7, 2025: Campaign WSD8 indicates that some of the "optimized" heaters installed as part of WPL8 are failing. See: https://www.taycanforum.com/forum/t...-heater-wsd8-april-17-2025.26629/#post-398704
Edit link revised TSB dated Nov. 25, 2025: https://static.nhtsa.gov/odi/tsbs/2025/MC-11026402-0001.pdf

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[Tooney]

@Jonathan S. got ahead of the swarm of the rest of us.

 

[Jonathan S.]

The only conceivable explanation is that PCNA has been Strava Stalking me and based upon a historical analysis of my driving patterns concluded that a properly functioning heater is a top priority for my travel patterns and hence replaced mine ASAP instead of setting aside replacement heaters for broken heaters.
Next up will be North America's only Porsche Charging Lounge coming soon to the intersection of I-89 and I-91!

 

[whitex]

My Taycan definitely has a heater produced before 2/14/2023 (since I picked it up few days before than), yet not part of the campaign. I hope it's not because I picked it up in a warm state (SC), where Porsche decided to save money on anti-freeze windshield wiper fluid when performing PDI in February, knowing they don't even have heated washer nozzles . Long story short, the fluid froze as soon as I started making my way home. The heater made it through the trip ok though.

Should the heater fail during any road trips, I could now use this TSB to prove that they could have foreseen this situation, so should be on the hook for all recovery costs, comparable rental, trip interruption/resumption costs. I am thinking of doing a road trip to California this winter - up to 1,000 mile tow home, depending on where it breaks down.

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