What it means
The ECM detects a circuit 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 turns high-voltage battery power into low-voltage power used by the 12-volt system. The control module monitors current sensor C and its circuit; this code sets when that circuit fails its electrical checks, leaving the module without a dependable reading from sensor C.
Common causes
Most likely first.
- Sensor failed
- Wiring or connector fault
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, comparing its behavior with other available converter current readings.
- Check for related converter and hybrid-system codes that may indicate a shared supply or wiring problem.
- With the vehicle powered down using the manufacturer’s high-voltage safety procedure, inspect sensor C’s connector and wiring for damage, looseness, moisture, or corrosion.
- Check the sensor C circuit for opens, shorts, and poor terminal contact using the manufacturer’s diagnostic procedure.
- If the wiring and connector pass inspection and circuit tests, test current sensor C as directed by the manufacturer and replace it if faulty.
Common fixes
- Secure or clean a loose or corroded sensor C connector.
- Repair open, shorted, or damaged wiring in the sensor C circuit.
- Replace current sensor C if the circuit is sound and the sensor fails its specified checks.
Can I keep driving?
If the vehicle reports reduced power, limited electric drive, or charging problems, keep trips short and avoid relying on it for demanding driving. A sensor C circuit fault can lead to further hybrid-system limits; stop if power drops sharply or a severe warning appears.
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.