What U0293 means
The hybrid vehicle network has lost the hybrid control unit (HCU).
How the engine computer detects it
The vehicle drops out of hybrid operation, often forced into a fail-safe mode that limits torque.
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
- HCU unpowered Most likely
- HV interlock loop opened Possible
- Gateway module routing CAN messages incorrectly Less likely
How to diagnose U0293
- 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: hybrid control unit, 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 U0293 most
| Vehicle | Years | Reports | Share | Median miles |
|---|---|---|---|---|
| Toyota Prius | 2004–2014 | 3 | — | |
| Jeep Wrangler | 2021–2024 | 3 | — | |
| Hyundai Sonata | 2012–2017 | 3 | — |
Counts of owner complaints to the NHTSA that mention U0293 (16 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
- 293
- Specific fault
Questions drivers ask
Can I drive with code U0293?
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 U0293. They can point to a shared cause, so it's worth checking them together.
- P1326Manufacturer-specific code5 complaints
- U1004Manufacturer-specific code5 complaints
- U0100Lost Communication with ECM/PCM "A"3 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.