What it means
The starter/generator control module reports a generic fault. Internal self-tests fail or response time outside calibration.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
The starter/generator control module manages the machine that can start the engine and provide electrical assistance or charging. The vehicle monitors the module’s self-checks and how promptly it responds to commands; this code sets when an internal check fails or its response falls outside the expected calibration.
Common causes
Most likely first.
- Internal module fault
- Communication degraded
Symptoms
- Hybrid system warning light on
- Vehicle may not enter READY mode
- Reduced starting or charging assistance
How to diagnose it
- Record all hybrid-system codes and freeze-frame data first, since related supply or communication faults may explain the module report.
- Check the 12-volt battery condition and module power and ground connections, because unstable supply can disrupt startup and self-tests.
- Inspect the starter/generator control module connectors and harness for looseness, corrosion, moisture, or damage.
- Use a capable scan tool to check whether the module communicates and review any available status or response data.
- If power, ground, and wiring are sound, follow the manufacturer's diagnostic procedure to confirm an internal module fault before replacement.
Common fixes
- Repair loose, corroded, or damaged module wiring and connectors.
- Correct a weak 12-volt battery or poor power or ground connection.
- Resolve any related communication fault in the network wiring.
- Replace or program the starter/generator control module if testing confirms internal failure.
Can I keep driving?
A vehicle that will not enter READY mode or has reduced starting or charging assistance may leave you stranded, so avoid relying on it for a necessary journey. If it is in limp mode, stop somewhere safe and arrange diagnosis.
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.