STMV1/STMV1-H
Choose your kit
Choose STMV1 for multifunction, or STMV1-H for supported heating. Active Mode Switch control is not included.
Free worldwide express shipping. DHL/FedEx. Import duties may apply.
Adapter kit only; wheel sold separately.
Installation & coding
Extra parts or PIWIS coding may be needed. Paul can check your setup before you order.
OEM compatibility and returns
GPS Adapter supports OEM equipment only. Non-OEM equipment is not supported, including aftermarket stereo configurations. Returns due to incompatibility with non-OEM equipment are subject to a $40 restocking fee.
Product details
Proven Porsche multifunction and heated steering wheel retrofit support since 2016.
Adapter kit only. Steering wheel and airbag are not included. STMV1 / STMV1-H do not add functional Mode Switch control.
Choose STMV1 for multifunction operation without added steering wheel heating support. Choose STMV1-H when the replacement wheel and vehicle use compatible heating hardware. Exact requirements depend on the vehicle, original steering wheel and replacement wheel.
Before ordering: review the compatibility guide and email clear photos of both steering wheels to info@gpsadapter.us. We will confirm the correct adapter and required parts.
OEM equipment only. Compatibility with non-OEM components is not guaranteed. See the OEM vs. non-OEM guide.
Shipping: Free worldwide DHL/FedEx Express shipping is included. Local import duties may apply.
Frequently Asked Questions
Which steering wheel upgrades are supported?
Our adapters fit 958.2, 991.2, 718, and 982 multifunction steering wheels onto earlier Porsche models. 992-style wheels and post-2023 Cayenne facelift wheels are not supported.
Is a 991.1 to 991.2 upgrade plug & play?
It depends on the original wheel, requested functions and installed hardware. Some supported configurations are plug-and-play; others need compatible steering-column hardware and PIWIS coding. Use the Fitment Check before ordering.
What is the difference between STMV1 and STMV1-H?
STMV1 supports multifunction controls without steering wheel heating. STMV1-H adds heating support for compatible cars.
I bought the version without heat support. Can I add heating later?
Heating requires STMV1-H and compatible wheel and vehicle hardware. Email info@gpsadapter.us with your model, year and wheel photos to confirm the correct kit and upgrade requirements before changing the adapter.
My car did not come with heating. What is needed to add heating and multifunction?
A compatible heated wheel, steering-column electronics/clock spring, the correct adapter and any required activation or PIWIS coding are needed. Parts and coding vary by model and existing equipment. The module and activation-code details in our heating and multifunction activation guide apply to the configuration covered there. Confirm your exact requirements with Paul and your installer before buying parts or VIN-specific activation codes.
What do the .C / .E suffixes on the control unit part number mean?
.E supports multifunction with heat; .C supports multifunction only, without heat. A heat-capable control unit has a dedicated heating socket on top; if your wheel has no heating, it is normal for that socket to remain empty.
Do the airbag, paddle shifters, and horn need the adapter?
No, they connect directly without needing an adapter. The airbag plugs directly into the original clock spring. Note the old airbag cannot be reused (different size and connector).
When is PIWIS coding required?
Whenever the steering column control module is replaced. A Porsche dealership must install and initialize the new module (including the clock spring), activate the functions with PIWIS, and perform steering angle calibration.
Do you support non-OEM parts?
GPS Adapter supports OEM equipment only. Compatibility with non-OEM control modules, wheels, paddles, or stereos is not guaranteed.
