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 DHL/FedEx Express shipping. Local import duties may apply. Adapter kit only; steering wheel sold separately.
Installation & coding
Some upgrades need extra parts or PIWIS coding. Requirements depend on your car and the functions you want. Paul can help 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.
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?
Yes.
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?
Yes. The heat upgrade includes an extra connector and a heat control switch button. You can either solder two joints on the Adapter-A mainboard or exchange for the heat support adapter directly.
My car did not come with heating. What is needed to add heating and multifunction?
1. Replace the steering column control module (including the clock spring) with part number 958.652.568.14, which supports multifunction and heating.
2. Purchase VIN-specific multifunction and heating activation codes at code-porsche.com.
3. Have a Porsche dealership install and initialize the new module, activate the functions with PIWIS, and perform steering angle calibration.
4. Install the new steering wheel. See the heating and multifunction activation guide.
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.
