What it means
The hybrid control module detects an internal performance fault on the HV battery monitor processing. SOC/SOH calculations may be unreliable.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
The hybrid control module processes data from the high-voltage battery monitor to estimate state of charge and battery health. P0E2D indicates that this monitor processing is not performing as expected, so the module may limit power or charging if its estimates are unreliable.
Common causes
Most likely first.
- Internal monitor processing fault
- Inconsistent data from sensor modules
- Pack cell imbalance approaching service threshold
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
- Save freeze-frame data and review battery state-of-charge, state-of-health, and related monitor data for implausible values or sudden changes.
- Check for accompanying battery-monitor, cell-voltage, or sensor-module codes, since inconsistent input data can cause a performance fault.
- Review available cell-voltage and temperature data for imbalance or outlying readings that could affect the monitor's calculations.
- Inspect the accessible battery-monitor module connectors and low-voltage wiring for loose, damaged, or corroded connections, following the vehicle's service instructions.
- If the data inputs and connections are sound, use the manufacturer's diagnostic procedure to evaluate the hybrid control module's battery-monitor processing.
Common fixes
- Repair loose or corroded battery-monitor module connections.
- Address a confirmed cell imbalance or faulty sensor-module data source according to the manufacturer's procedure.
- Repair the hybrid control module wiring or data connections if faulty.
- Replace or reprogram the hybrid control module only if its internal monitor processing is confirmed faulty.
Can I keep driving?
Expect possible reduced power, limited charging, or reduced electric range, and avoid trips that depend on full hybrid performance. If the vehicle enters limp mode or charging fails, stop safely and arrange prompt diagnosis.
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.