Faulty coolant pump motor drawing excessive current; Short circuit or damaged wiring in the pump control circuit; Corroded or loose electrical connectors at the pump or control module; Overheating of the pump driver due to poor ventilation or high ambient temperatures; Internal failure in the hybrid/EV control module driver circuit; Coolant leak or blockage causing the pump to overwork

DTC codes / P0Exx · Hybrid propulsion / P0E1F

P0E1FHybrid/EV Battery Pack Coolant Pump A Control Circuit Driver Current/Temperature Too High

P0E1F indicates that the hybrid or electric vehicle battery pack coolant pump control circuit has detected excessive current or temperature in its driver stage. The computer monitors the pump driver and sets this code when the current draw or internal driver temperature exceeds safe limits, often due to a failing pump, wiring fault, or control module issue.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

AreaHybrid propulsion

Symptoms you may notice

Illumination of the hybrid system warning light or service vehicle soon message
Reduced hybrid/EV performance or limited power output
Battery pack overheating warning or reduced charging rate
Coolant pump may be inaudible or not running when the vehicle is on
Often no symptoms besides the warning light, especially if the fault is intermittent

Common causes, most likely first

Faulty coolant pump motor drawing excessive current
Short circuit or damaged wiring in the pump control circuit
Corroded or loose electrical connectors at the pump or control module
Overheating of the pump driver due to poor ventilation or high ambient temperatures
Internal failure in the hybrid/EV control module driver circuit
Coolant leak or blockage causing the pump to overwork

How to diagnose and fix it

Scan all modules for related codes and record freeze-frame data to understand when the fault occurs
Visually inspect the coolant pump, wiring, and connectors for damage, corrosion, or leaks
Measure the resistance of the pump motor and compare to specifications
Check the control circuit for shorts to ground or power using a multimeter
Test the pump driver output with a bidirectional scan tool if available
Replace the coolant pump if it fails electrical or mechanical tests
Repair or replace damaged wiring or connectors as needed

Don't overlook the pump driver circuit

A pump that runs but draws excessive current can set this code without completely failing, so current ramping tests are more revealing than simple on/off checks.
The driver temperature fault often triggers after extended driving or in hot climates, leading technicians to miss it during a cold shop test.
Corrosion inside the pump connector can increase resistance and cause the driver to overheat, so always inspect terminals under magnification.
This code can be set by a control module firmware issue that misinterprets driver temperature, so check for software updates before replacing hardware.
A restricted coolant passage or air pocket can make the pump work harder and overheat the driver, so verify coolant flow and bleed the system properly.

Can I keep driving with P0E1F?

It is not advisable to continue driving with this code because the coolant pump may stop working, leading to battery overheating and potential damage. If you must drive, avoid heavy acceleration and long trips, and monitor for overheating warnings.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.