What it means
The ECM detects a low fault on the dc/dc converter current sensor c circuit. Reading cannot be used reliably for control.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
The DC/DC converter supplies the vehicle’s 12-volt system by converting high-voltage battery power. The control module monitors the current sensor C signal; this code sets when that signal falls below its expected range, so the module cannot use it reliably to assess converter current.
Common causes
Most likely first.
- Signal wire shorted to ground
- Internal sensor short
- Connector pins corroded - high contact resistance
Symptoms
- Hybrid or EV system warning light
- Reduced power or limited electric drive
- Charging may be limited
- Reduced electric range
How to diagnose it
- Record freeze-frame data and check live data for current sensor C to confirm the low signal and the conditions when it occurs.
- Check for related converter or hybrid-system codes that might point to a shared electrical fault.
- With the vehicle powered down using the manufacturer’s high-voltage safety procedure, inspect sensor C’s signal wire for damage or a short to ground.
- Check the sensor C connector for corrosion, loose terminals, or moisture that could pull down the signal.
- Test the signal circuit for a short to ground and check sensor C using the manufacturer’s diagnostic procedure; replace the sensor if the wiring and connections are sound but the signal stays low.
Common fixes
- Clean and secure corroded or loose sensor C connector terminals, replacing damaged terminals as needed.
- Repair the sensor C signal wire if it is shorted to ground or damaged.
- Replace current sensor C if its output remains low after the circuit is repaired.
Can I keep driving?
Avoid long trips if power is reduced, electric drive is limited, or charging is affected. The low sensor C signal can interfere with converter control and may lead to additional hybrid-system restrictions.
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.