What it means
The reporting module has lost communication with the hybrid/EV powertrain control module. It sets this code when expected messages from that module are not received for a specified time.
How it works
The hybrid or EV powertrain control module coordinates key propulsion functions and sends operating messages to other vehicle modules. This code sets when a reporting module does not receive those expected messages for the required time, which can prevent the vehicle from entering Ready mode or using hybrid propulsion.
Common causes
Most likely first.
- Module power or ground fault
- Damaged or corroded network wiring or connectors
- CAN bus short or open circuit
- Hybrid/EV control module failure
- Low 12-volt battery voltage
Symptoms
- Hybrid or EV warning message
- Reduced or unavailable hybrid propulsion
- Vehicle may not start or enter ready mode
- Other communication codes
How to diagnose it
- Scan all modules for freeze-frame data and other communication codes, and check whether several modules report the hybrid/EV powertrain controller missing.
- Check 12-volt battery condition and connections first, because low system voltage can interrupt module startup and network communication.
- Inspect the powertrain controller's accessible low-voltage connectors and network harness for looseness, corrosion, water or damage; do not disturb high-voltage cables.
- Using the wiring diagram, verify the controller's specified power and ground, then test the network circuits for opens or shorts according to manufacturer procedures.
- If supplies and network wiring are sound, follow manufacturer diagnostics to assess the controller and any gateway routing it depends on; leave high-voltage diagnosis to qualified personnel.
Common fixes
- Charge or replace a weak 12-volt battery if testing confirms it cannot support the vehicle's specified voltage, and clean or secure its connections.
- Repair a loose, corroded or damaged low-voltage connector at the hybrid/EV powertrain controller.
- Repair an open or short in the controller's network wiring.
- Restore the controller's specified power or ground by repairing the confirmed feed, fuse or ground fault.
- Replace the controller only after its power, ground, network and gateway paths test correctly.
Can I keep driving?
If the vehicle will not enter Ready mode or hybrid propulsion is unavailable, do not rely on it for a journey; arrange recovery if it cannot move safely. If it remains drivable, go only as far as needed to reach a safe location, since propulsion may become reduced or unavailable.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.