What U0146 means
Lost Communication with Gateway "A": the control module has detected this fault condition.
Written from public technical sources and not yet checked by a mechanic. How we write these pages
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Common causes
- Gateway unpowered (often a fuse on the central electronics) Most likely
- Gateway internally failed Possible
- Gateway module routing CAN messages incorrectly Less likely
How to diagnose U0146
- Read every stored code with an OBD-II scanner. If misfire or fuel trim codes are there too, fix those first: they often cause this one.
- Inspect the parts involved: gateway module, can bus wiring.
- Work through the causes above from most to least likely, cheapest checks first.
- Clear the code and drive a full drive cycle to confirm the repair held.
Vehicles that report U0146 most
| Vehicle | Years | Reports | Share | Median miles |
|---|---|---|---|---|
| Chevrolet Silverado 1500 | 2019–2022 | 5 | 3k | |
| GMC Sierra 1500 | 2025 | 3 | — |
Counts of owner complaints to the NHTSA that mention U0146 (11 in total), not failure rates: popular models get more complaints simply because more of them are on the road. Models with fewer than 3 complaints are left out.
Reading the code
- U
- Network
- 0
- Generic (SAE) code
- 146
- Specific fault
Questions drivers ask
Can I drive with code U0146?
It depends on which module stopped communicating. If the car drives normally, drive carefully to a shop. If the engine, transmission, brakes or steering act up, or many warning lights come on at once, stop and have it towed.
Often reported together
Codes that owners mention in the same NHTSA complaints as U0146. They can point to a shared cause, so it's worth checking them together.
- U0101Lost Communication with TCM10 complaints
- U0100Lost Communication with ECM/PCM "A"6 complaints
- P25A2Brake System Control Module A Requested MIL Illumination4 complaints
- U0131Lost Communication with Power Steering Control Module4 complaints
- U0140Lost Communication with Body Control Module4 complaints
- U160FManufacturer-specific code3 complaints
This page is general information, not a substitute for a professional diagnosis. Repair costs are rough estimates for parts and labor and vary by vehicle and region.