P2E41

Code

Generic P — Powertrain

Hybrid/EV Electronics Coolant Pump B Control Circuit/Open

Brand: Generic

Type: P — Powertrain

Views: UK: 15 EN: 28 RU: 18

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Page language: EN

Malfunction indicator lamp (MIL) or warning message related to hybrid/EV cooling
Auxiliary/inverter coolant pump B does not run when commanded (no flow)
Reduced thermal management of inverter/EV electronics; possible power derate or reduced regen
Cooling system warning, overheating of inverter or battery components
Noise absence from pump when it should be running (no vibration)
Intermittent operation if wiring is intermittent

Read freeze frame and live data with a scan tool; confirm P2E41 is current or historic
Perform an active test/command pump B ON using a scan tool and observe pump operation
Visually inspect connectors, wiring harness, and junctions for corrosion, water ingress, burns, or damage
Check fuses and relays related to the pump circuit
Backprobe pump connector while commanding pump: verify supply voltage (battery), control signal (PWM or switched ground), and ground continuity
Measure resistance of pump motor windings (with battery disconnected) and compare to expected low-ohm value; open or very high resistance indicates a failed motor

Supply voltage (pump supply terminal): approx. battery voltage 12–14 V with ignition ON/when commanded
Control signal: PWM or ON/OFF from hybrid/inverter control module; duty cycle 0–100% when commanded via active test
Control output idling: near 0 V (off) or switching between 0 V and battery voltage when PWMed (depending on drive type)
Expected motor resistance: low (typically single-digit ohms to tens of ohms depending on pump). An open/infinite reading indicates an open circuit
Expected current draw when running: typically low to moderate DC motor current (often 1–10 A depending on pump). Very low/no current = open circuit; very high = short/locked rotor

Verify code and conditions: retrieve freeze frame and note vehicle state when DTC set (ignition state, temperatures)
Attempt active test: use scan tool to command Coolant Pump B ON while monitoring wiring harness and listening for pump operation
Inspect visible wiring and connectors at pump B and at control module for damage, corrosion, loose pins, or water intrusion; repair or reseat connectors as required
Check fuses and relays for the pump circuit; replace any blown components and retest
Backprobe pump connector while commanding pump: measure supply voltage, control output (PWM or switched ground) and ground continuity. Document readings.
If supply or control signal missing, trace wiring back to module: check continuity between pump connector and module connector; repair any opens
If control signal present but pump does not run and motor resistance is open or very high, remove pump and measure winding resistance across motor terminals; replace pump if open/failed
If pump motor and wiring check good but control module output shows abnormal voltage (stuck high/low or open) or the module reports driver fault, consider module-level fault. Confirm with bench tests or refer to manufacturer module diagnostics before replacement
After repairs, clear codes and perform drive/functional cycle to verify pump operates under normal conditions and code does not return