What it means
The hybrid control module detects a circuit high fault on the high-voltage battery coolant level sensor. Coolant loss in the battery loop cannot be detected reliably.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
The battery coolant level sensor provides a signal that the hybrid control module uses to monitor coolant in the high-voltage battery loop. P2BE3 sets when that signal is higher than expected, which can result from a signal wire short to power, an open sensor, or poor connector contact.
Common causes
Most likely first.
- Signal wire shorted to B+
- Open level sensor
- Connector pins corroded - high contact resistance
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
- Record freeze-frame data and inspect the live level-sensor reading for a fixed or implausibly high value.
- Check the battery coolant reservoir and loop for leaks or a genuinely low coolant level.
- With the vehicle safely powered down, inspect the sensor connector for corrosion, loose or damaged terminals, and harness damage.
- Follow the manufacturer's wiring diagram to check the signal wire for a short to power and verify connector continuity.
- If the wiring checks out, test the sensor for an open or failed output using the manufacturer's procedure.
Common fixes
- Repair corroded, loose, or damaged sensor connector terminals.
- Repair a signal wire shorted to power and correct any damaged insulation.
- Replace the level sensor if it is open or fails its specified test.
- Fix any coolant leak and refill the loop using the vehicle's specified procedure.
Can I keep driving?
The vehicle may limit power or charging, while the high battery coolant level reading may be unreliable. Avoid strenuous driving and get the fault checked promptly; stop if a temperature 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.