What it means
The ECM detects a range/performance 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 converts high-voltage power into low-voltage power for the 12-volt system. The control module uses current sensor C to monitor converter current; this code sets when sensor C’s output falls outside its expected operating range or does not respond as expected, making the reading unreliable.
Common causes
Most likely first.
- Sensor characteristic drifted
- Sensor mounting displaced
- Sensor element aged beyond calibration window
Symptoms
- Hybrid or EV system warning light
- Reduced power or limited electric drive
- Charging may be limited
- Reduced electric range
How to diagnose it
- Save freeze-frame data and inspect live data for current sensor C to see whether its reading is implausible or fails to track converter operation.
- Check for related converter or hybrid-system codes that could indicate another fault affecting the sensor reading.
- With the vehicle powered down according to the manufacturer’s high-voltage safety procedure, inspect sensor C’s mounting and connector for displacement, looseness, or corrosion.
- Inspect sensor C’s wiring for visible damage and check its terminals for secure contact.
- Test sensor C’s output and circuit against the manufacturer’s procedure and specification; replace the sensor if it remains out of range with correct mounting and sound wiring.
Common fixes
- Secure or clean the sensor C connector if it is loose or corroded.
- Repair damaged sensor C wiring or terminals.
- Correct sensor C’s mounting if it has shifted.
- Replace current sensor C if its output remains out of range after mounting and circuit faults are ruled out.
Can I keep driving?
Limit driving if the vehicle has reduced power or limited electric drive, and avoid long journeys until the reading is checked. An unreliable sensor C reading may lead to restricted charging or electric range and further hybrid-system limits.
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.