What it means
The HV battery temperature sensor N reports a circuit intermittent/erratic fault. Cell-group temperature monitoring impaired on this channel.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
Sensor N monitors temperature at one area of the high-voltage battery, and the control module watches the signal for stable, plausible readings. This code sets when the N signal becomes intermittent or erratic, often because the connector is not seated, contact changes with vibration, or the ground reference is noisy.
Common causes
Most likely first.
- Connector not seated
- Noisy ground reference
- Connector with intermittent contact under vibration
Symptoms
- EV/hybrid system warning light on
- Reduced power output or limp mode
- Charging may fail or be slowed
- Reduced electric range
How to diagnose it
- Read freeze-frame data and watch Sensor N live temperature alongside other battery readings for dropouts or sudden jumps.
- With the vehicle powered down per the manufacturer's instructions, inspect the N connector for incomplete seating, corrosion, or damaged terminals.
- Inspect the N harness and ground reference for looseness, chafing, or damage that could cause intermittent contact.
- Follow the manufacturer's diagnostic procedure to monitor the N signal while checking accessible wiring and connectors for dropouts.
- If no connection fault is found, test Sensor N and its ground circuit, then the module input.
Common fixes
- Fully seat and secure the Sensor N connector.
- Clean or repair corroded or damaged N connector terminals.
- Repair a loose ground reference or damaged harness affecting Sensor N.
- Replace Sensor N if its output remains erratic with stable wiring and connections.
Can I keep driving?
Unstable Sensor N data can trigger changing power or charging limits. Keep driving gentle and brief, and stop if the vehicle issues a stop warning or loses substantial power.
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.