Fixing Rainbow Module UDS Conflicts: Our Simple, Passive Bypass

If you're running a Rainbow module in your Audi and using other tools that rely on UDS diagnostics (like the 034Motorsport SPI App, OBDeleven, or custom gateways), you may have already hit a frustrating problem—UDS request collisions.

Rainbow periodically sends its own UDS requests to update virtual cockpit features like power/torque, TPMS, and shift lights. The issue? These unsolicited requests interfere with diagnostic tools expecting uninterrupted UDS access.

After extensive logging and real-world testing, we built a passive fix that resolves this.

The Solution: Gateway Separation

Our Active Gateway now supports bus isolation and rerouting logic. Rainbow is placed on its own CAN channel (Bus 3), while the vehicle diagnostic line is kept clean for proper scan tool operation. Internally, the gateway filters and relays just the required data to keep Rainbow happy—without interfering with your scan tool or ECU flashing tools.

No patches, no firmware mods to Rainbow, and no interference.

Compatibility

This fix works with:

• All Rainbow modules
• OBDeleven & VCDS
• 034Motorsport SPI App
• Custom UDS tools or Teensy/ESP32-based gateways

Installation

You just need:

• Our triple-CAN Active Gateway
• 54-pin extension harness for plug-and-play access
• Rainbow module + your existing OBD cable

No wire cuts, no coding needed—just clean, split-bus logic that works.