What it means
The control module monitors the DC/DC converter voltage sensor A signal for stable, consistent readings. It sets this code when the signal is intermittent or erratic.
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 A sends a signal the control module expects to remain stable as converter conditions change. P0E35 sets when that signal drops out or fluctuates erratically, often because of a loose connection, an unstable ground, or vibration-sensitive contact.
Common causes
Most likely first.
- Sensor connector not seated
- Noisy ground reference
- Connector with intermittent contact under vibration
Symptoms
- Hybrid/EV system warning light may turn on
- Reduced power or charging performance
How to diagnose it
- Review freeze-frame data and graph sensor A's live signal to see whether it drops out or jumps, noting whether sensor B remains steady.
- Inspect sensor A's connector for incomplete seating, loose locks, corrosion, or terminals that may lose contact.
- Check the sensor A harness and ground path for chafing, loose connections, or damage that could change with vibration.
- Using the manufacturer's procedure, monitor the signal while gently checking the accessible harness for a change; do not disturb high-voltage components.
- If the wiring and ground remain stable, test sensor A for intermittent output and replace it only if the fault is confirmed.
Common fixes
- Fully seat and secure the sensor A connector.
- Repair loose, corroded, or damaged terminals in the sensor A circuit.
- Restore a stable sensor A ground connection.
- Repair vibration-damaged wiring or replace sensor A if its output is confirmed intermittent.
Can I keep driving?
Because the fault can come and go, converter performance may change unexpectedly and reduced power can occur. Avoid demanding trips; stop safely if a warning appears or power becomes inconsistent.
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.