RetroFix – CCS Retrofit Harness for Tesla Model 3 (Pre-Oct 5, 2020)

RetroFix – CCS Retrofit Harness for Tesla Model 3 (Pre-Oct 5, 2020)

Unlock DC Fast Charging Worldwide on Your Older Model 3

RetroFix is a purpose-built, automotive-grade retrofit harness that enables CCS (Combined Charging System) capability on Tesla Model 3 vehicles manufactured before October 5, 2020. This essential upgrade makes it possible to install a Gen4 Charge Port ECU (CP-ECU) — giving your car the power to charge at DC fast chargers everywhere.

With RetroFix installed, your Tesla opens up to a global network of DC Fast Chargers (DCFC) — from high-speed CCS stations at highways to rapid public chargers in urban settings.

What RetroFix Does

• Enables installation of a Gen4 Charge Port ECU required for CCS charging

• Activates support for DC fast charging globally (CCS1 or CCS2 depending on region)

• Works seamlessly with genuine Tesla parts (CP-ECU purchased separately from Tesla EPC)

• Expands the charging capability of older Model 3s to modern standards

RetroFix does not include the Gen4 CP-ECU or the CCS adapter — you’ll need those items to complete the upgrade.

Plug-and-Play Installation

Designed to be straightforward and service-friendly, RetroFix installs quickly with minimal tools and doesn’t require powering down the car.

Installation Overview:

1. Tools Required:

   • 10 mm socket

   • Screwdriver or trim removal tool

2. Access:
   Remove the right-rear trunk trim and open the carpet behind the charge port while unplugging the trunk light.

3. Swap ECU:
   Remove the old Charge Port ECU by unscrewing the 10 mm bolt.

4. Install:
   Attach the new Gen4 CP-ECU and plug RetroFix in-line.
   The connectors are keyed — they only fit the correct ports, preventing mis-connection.

5. Finish:
   Reassemble trim panels and perform a software reinstall or allow the car to redeploy via Service Mode.

No special configuration tools are needed — RetroFix uses automotive-grade components and retains full compatibility with Tesla systems.

Compatibility & Requirements

• Vehicle: Tesla Model 3 built before October 5, 2020

• Parts Needed:

  • Gen4 Charge Port ECU (Tesla EPC)

  • CCS1 or CCS2 adapter (region dependent)

• Function: Enables CCS/DC fast charging using compatible hardware

RetroFix doesn’t interfere with any vehicle software or updates and is fully reversible if needed.

Warranty

1-Year Limited Warranty from the date of purchase.
Warranty covers manufacturing defects — misuse or improper installation not included.

Ready to bring modern charging capability to your classic Model 3?
Add RetroFix to your cart and extend your EV’s charging potential today.