Faulty battery charger temperature sensor (internal failure or drift); Damaged, corroded, or disconnected wiring or connector at the charger; Open or short circuit in the sensor signal or return circuit; Failed or overheating battery charger assembly affecting the sensor; Poor electrical ground for the charger module; Software or calibration issue in the control module (less common)

DTC codes / P0Exx · Hybrid propulsion / P0E80

P0E80Battery Charger B Temperature Sensor Circuit

Q: What does code P0E80 mean?

Battery Charger B Temperature Sensor Circuit. P0E80 indicates that the powertrain control module has detected an abnormal signal from the temperature sensor built into the battery charger for the high-voltage battery pack. The computer compares the sensor's voltage against expected values and flags the circuit when the reading falls outside the valid range or behaves erratically.

P0E80 indicates that the powertrain control module has detected an abnormal signal from the temperature sensor built into the battery charger for the high-voltage battery pack. The computer compares the sensor's voltage against expected values and flags the circuit when the reading falls outside the valid range or behaves erratically.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaHybrid propulsion

Symptoms you may notice

Illumination of the check engine light or a dedicated service vehicle soon message
Often no symptoms besides the warning light, especially in mild weather
Reduced or disabled high-voltage charging, particularly in hot or cold conditions
A charging system warning or high-voltage battery fault message on the dashboard
Longer charging times or the charger refusing to start
In rare cases, the vehicle may enter a reduced-power limp mode

Common causes, most likely first

Faulty battery charger temperature sensor (internal failure or drift)
Damaged, corroded, or disconnected wiring or connector at the charger
Open or short circuit in the sensor signal or return circuit
Failed or overheating battery charger assembly affecting the sensor
Poor electrical ground for the charger module
Software or calibration issue in the control module (less common)

How to diagnose and fix it

Scan all modules and record freeze-frame data for P0E80 before clearing anything
Inspect the charger harness and connector for chafing, corrosion, or loose pins
Measure sensor resistance and compare to the manufacturer's temperature chart
Check for continuity and shorts in the signal and return wires between sensor and controller
Verify the charger's ground connection and supply voltage under load
If the sensor is internal to the charger and not serviceable, replace the charger assembly
After repair, clear codes and perform a charging cycle to confirm the sensor reads correctly

What the charger temperature sensor really does

The sensor protects the charger from overheating, so a fault can cause charging to be limited or disabled even when the charger still works.
A common misdiagnosis is replacing the entire charger when only a corroded connector or chafed wire is at fault.
The sensor is often a negative temperature coefficient thermistor, so resistance rises as temperature falls, making cold-weather behavior a useful clue.
Some vehicles use the charger temperature signal for battery thermal management, so a fault can affect both charging and cooling strategies.
After a charger replacement, some models require a calibration or learn procedure, and skipping it can set the code again.

Can I keep driving with P0E80?

You can usually drive the vehicle, but high-voltage charging may be limited or disabled, so avoid long trips that depend on charging and do not ignore overheating smells or charging faults. Have the circuit inspected promptly to prevent charger damage.

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.