What it means
Hybrid/EV electronics coolant pump B reports a control circuit high condition. Power electronics cooling on this branch is impaired.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
Pump B circulates coolant through a branch serving hybrid or EV power electronics. The control module monitors the pump's control circuit and sets P2E44 when it detects a higher-than-expected electrical level, which can indicate a poor connection or a fault in the pump or its driver.
Common causes
Most likely first.
- Pump motor or driver fault
- Air or coolant level issue
- Connector pins corroded - high contact resistance
Symptoms
- Check-engine or hybrid-system warning light
- Reduced power or limited hybrid operation
- Possible power-electronics overheating warning
How to diagnose it
- Record freeze-frame data and scan hybrid-system live data for pump B commands, feedback, and any related cooling or temperature faults.
- With the vehicle safely powered down according to its owner information, check the coolant level and look for leaks or signs of air in pump B's cooling branch.
- Inspect pump B's connector and accessible wiring for corrosion, loose pins, damage, or moisture that could raise circuit resistance.
- Compare pump B's control-circuit readings with the manufacturer's specification and check for an open, short, or high-resistance connection.
- If wiring and connections pass, test pump B and its driver using the manufacturer's procedure to determine which has failed.
Common fixes
- Correct low coolant or bleed air from pump B's branch using the vehicle's specified procedure.
- Clean or repair corroded, loose, or damaged pump B connector terminals and wiring.
- Replace a faulty pump B motor or integrated driver after confirming the circuit condition.
- Clear the code and verify pump B operation and power-electronics temperatures.
Can I keep driving?
Limit driving and avoid heavy acceleration, steep climbs, or other high-load use because impaired cooling can overheat power electronics and trigger reduced-power operation. If an overheating warning appears or power is limited, stop safely and arrange service.
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.