U0293 means the hybrid vehicle's powertrain control module (HPCM) has lost communication on the controller‑area‑network (CAN) bus. The code is set when other modules cannot receive or send data to the HPCM, usually because of wiring, power, or network problems rather than a failed computer itself.
The harness that carries CAN messages to and from the HPCM can be broken, corroded, or not fully seated, causing the module to appear offline.
A blown fuse, low battery voltage, or poor ground prevents the module from powering up, leading to loss of communication.
Another control unit on the same network may be pulling the bus low or failing, which blocks communication with the HPCM.
The HPCM itself can suffer an internal electronic fault, but this is a less common cause compared with wiring or power issues.
An outdated or corrupted program in the HPCM can cause communication loss; this scenario is relatively rare and usually addressed after other causes are eliminated.
No. The module itself fails only a small fraction of the time; most often the issue is wiring, connectors, power, or another module on the CAN bus.
Yes. Low battery voltage can prevent the HPCM from powering up, which will cause loss of communication and set U0293.
The car may be limited to limp mode or may not start at all. It is advisable to diagnose and repair the problem promptly to avoid being stranded.
Many independent shops can diagnose and repair the wiring, connectors, and power issues that cause this code. If the HPCM itself needs replacement, dealer‑level programming may be required, but that is rarely the root cause.