CAN network

U0293 — Lost Communication with Hybrid Powertrain Control Module

Severity: high Drive with care, to a shop

What U0293 means

U0293 means one or more control units on the CAN network have stopped receiving messages from the hybrid powertrain control module. That module coordinates the engine, the high-voltage battery and the electric motors. Without that data exchange, the system cannot safely manage power and usually limits operation or blocks startup.

Symptoms

  • Hybrid system warning message
  • Ready mode unavailable, car will not start
  • Several warning lamps on at once
  • Reduced power or limp mode
  • Functions of the affected module not working
  • Engine running constantly or not starting

Possible causes

  1. Weak or discharged 12V auxiliary battery
  2. CAN bus wiring open, shorted or chafed
  3. Corroded connectors or terminals
  4. Power or ground fault at the hybrid control module
  5. Failed hybrid control module
  6. Another faulty module loading down the bus
  7. Open high-voltage interlock circuit

How to diagnose

  1. Test the 12V battery voltage and terminals; charge or replace it if weak
  2. Run a full-module scan to see which modules do not communicate
  3. Record any other U-codes and hybrid codes, and review freeze frame data
  4. Measure CAN bus voltages and resistance at the diagnostic connector (about 60 ohms between CAN H and CAN L is normal)
  5. Inspect the hybrid module harness and connectors for damage, moisture and corrosion
  6. Check the module's power supply and grounds against the wiring diagram
  7. Check the high-voltage interlock circuit and related fuses
  8. Disconnect suspect modules one at a time only using the manufacturer's documented procedure

Common fixes

  • Charge or replace the 12V battery
  • Repair CAN wiring or replace damaged harness sections
  • Clean or replace corroded connectors and terminals
  • Restore power and ground to the module
  • Replace or reprogram the hybrid control module once it is confirmed faulty

Questions and answers

What does U0293 mean?

It means communication with the hybrid powertrain control module has been lost. Other modules are not receiving its messages over the CAN bus, so the hybrid system may run with limits or not start.

Can a weak 12V battery cause U0293?

Yes, it is one of the most common causes. Low voltage makes modules behave erratically and drop off the network, so the 12V battery should be tested first.

Can I drive with U0293?

Only if the car drives normally, and then only to a repair shop. It can suddenly lose power, and if Ready mode will not engage, the car cannot be driven.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.