U0146 on 2022-2024 Rivian R1T — Lost Communication With Gateway "A"
1 vehicles · 1 makes
Most Reported On
U0146 is an OBD-II diagnostic trouble code meaning “Lost Communication With Gateway "A".” Sets when a module loses data-bus communication with Gateway 'A' (the serial-data gateway module that bridges multiple vehicle networks). Because the gateway routes traffic between bus segments, loss can cascade into many lost-communication codes. This code is most commonly reported on 2022-2024 Rivian R1T.
Common Causes
Diagnostic Tools
This is a network/communication code. A basic engine-code reader will not show it — you need a scanner that reads all modules. These read U0146.
One caveat that applies to every scanner: only powertrain codes are standardised across manufacturers. Body, chassis and network coverage is "enhanced" diagnostics, and how deep it goes varies by make and model year — check your specific vehicle against the tool's coverage list before buying.
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level tablet with all-system coverage and bi-directional control, so you can command a module rather than only read it.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
What you can do yourself, and what needs a shop
Reading the code, clearing it, and watching whether it returns is a driveway job with the right scanner. These steps are not:
- Module programming or software updates — needs the manufacturer software or a J2534 pass-through with a paid subscription.
- Replacing a control module — most are VIN-programmed and immobilizer-registered, so a new one does nothing until it is coded to your car.
- Airbag/SRS component work — a stored fault can deploy a live device.
If the vehicle is still under warranty, check for an open recall or technical service bulletin before buying anything — the repair may already be covered.
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FAQ
What does U0146 mean?
U0146 stands for "Lost Communication With Gateway "A"." Sets when a module loses data-bus communication with Gateway 'A' (the serial-data gateway module that bridges multiple vehicle networks). Because the gateway routes traffic between bus segments, loss can cascade into many lost-communication codes.
What are the most common causes of U0146?
The most common causes of U0146 are: Open, shorted, or chafed bus wiring at the gateway module, Corroded or loose gateway connectors / poor ground, Blown fuse / lost power feed to the gateway, Low battery voltage, Failed gateway module. The specific cause varies by vehicle.
How much does it cost to fix U0146?
Repair costs vary widely depending on the root cause and vehicle.
Which vehicles are affected by U0146?
Au7o has documented U0146 across 1 vehicle models from 1 manufacturers: Rivian.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.