What it means
The ECM detects a high fault on the dc/dc converter voltage 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
DC/DC converter voltage sensor C monitors converter voltage for the vehicle's low-voltage charging system. This code sets when the sensor C signal is too high, which can happen if the signal wire contacts battery positive, the sensor is open internally, or connector contact is poor.
Common causes
Most likely first.
- Signal wire shorted to B+
- Open sensor
- 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 compare sensor C live data with converter and 12-volt readings to confirm the high signal.
- Inspect the sensor C connector for corrosion, loose seating, or damaged pins that could interrupt the circuit.
- Trace the sensor C signal wire for damage or contact with battery positive, following the vehicle's wiring information.
- Test for a short to battery positive and check the sensor circuit for an open using the manufacturer's procedure.
- If wiring and connector checks pass, test voltage sensor C and the DC/DC converter against specification.
Common fixes
- Repair sensor C wiring shorted to battery positive.
- Restore reliable contact by repairing or replacing damaged connector terminals.
- Replace voltage sensor C if it is open internally.
- Repair the DC/DC converter if its output fails the manufacturer's checks.
Can I keep driving?
Charging may be limited and the vehicle may reduce power or electric range, so avoid relying on full electric performance. If the vehicle limits power or displays a shutdown warning, stop safely and arrange assistance.
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.