What it means
The DC/DC converter voltage sensor C signal is lower than expected. The module sets this code when it detects low voltage in the monitored sensor circuit.
How it works
DC/DC converter voltage sensor C reports a converter voltage used to manage the low-voltage electrical supply. Despite the intermittent/erratic title, the supplied meaning describes a low signal; this code is therefore associated with a reading below the expected level, potentially from a short to ground, poor contact, or a sensor fault.
Common causes
Most likely first.
- Short to ground in sensor wiring
- Failed voltage sensor
- Poor connector contact
- DC/DC converter fault
Symptoms
- Hybrid or EV warning light
- 12-volt battery warning
- Electrical accessories may behave erratically
- Reduced power
How to diagnose it
- Save freeze-frame data and compare sensor C live data with the 12-volt system reading to confirm whether the signal is low and identify when it occurs.
- Inspect the DC/DC converter voltage sensor C connector for poor seating, corrosion, or damaged terminals that could interrupt its signal.
- Inspect the sensor C signal wiring for damage or a short to ground, especially where the harness passes near the converter.
- Test the circuit and connector contact against the manufacturer's procedure, monitoring for signal drops while checking the harness.
- If the circuit checks out, test sensor C and the DC/DC converter to determine whether either is causing the low reading.
Common fixes
- Reseat the sensor C connector and clean or repair serviceable poor contacts.
- Repair a short to ground or damaged wire in the sensor C circuit.
- Replace the voltage sensor C if it fails its specified output checks.
- Repair the DC/DC converter if its operation causes the sensor reading to fall below specification.
Can I keep driving?
A low sensor reading can coincide with a 12-volt battery warning or erratic accessories, so avoid unnecessary electrical loads and do not ignore worsening symptoms. If the warning remains on or power drops, have the charging system checked promptly.
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.