Faulty input current sensor or sensor circuitry within the battery charger.; Damaged or corroded wiring and connectors between the sensor and the control module.; A short to voltage or high-resistance ground in the sensor circuit.; Actual overcurrent condition on the charger's input, such as a faulty charger component drawing excessive current.; Control module software error or internal fault causing misinterpretation of the sensor signal.; Water intrusion or physical damage to the charger assembly affecting the sensor.

DTC codes / P2Dxx · Hybrid propulsion / P2D84

P2D84Battery Charger B Input Current Sensor Circuit High

Q: What does code P2D84 mean?

Battery Charger B Input Current Sensor Circuit High. P2D84 indicates that the battery charger's input current sensor circuit is reporting a voltage above the normal range, which the control module interprets as an excessively high current draw on the charger's input side. The computer has detected a signal that exceeds the expected threshold for the charger's input current, often due to a wiring fault, sensor failure, or an actual overcurrent condition.

P2D84 indicates that the battery charger's input current sensor circuit is reporting a voltage above the normal range, which the control module interprets as an excessively high current draw on the charger's input side. The computer has detected a signal that exceeds the expected threshold for the charger's input current, often due to a wiring fault, sensor failure, or an actual overcurrent condition.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaHybrid propulsion

Symptoms you may notice

Illumination of the check engine light or battery charger warning light, often with no other noticeable symptoms.
The battery charger may fail to initiate charging or may shut down shortly after starting.
Intermittent charging behavior, where the charger works sporadically or only under certain conditions.
Reduced charging performance, leading to a slowly draining battery or prolonged charge times.
In some cases, the vehicle may enter a reduced power mode or display a message related to the charging system.

Common causes, most likely first

Faulty input current sensor or sensor circuitry within the battery charger.
Damaged or corroded wiring and connectors between the sensor and the control module.
A short to voltage or high-resistance ground in the sensor circuit.
Actual overcurrent condition on the charger's input, such as a faulty charger component drawing excessive current.
Control module software error or internal fault causing misinterpretation of the sensor signal.
Water intrusion or physical damage to the charger assembly affecting the sensor.

How to diagnose and fix it

Inspect the battery charger and its wiring for obvious damage, corrosion, or loose connections.
Use a scan tool to read live data from the input current sensor and compare with expected values.
Perform a voltage drop test on the sensor circuit to check for high resistance or shorts.
Disconnect the sensor and measure resistance or voltage according to the manufacturer's specifications.
If the sensor is faulty, replace the sensor or the charger assembly as required.
Clear the diagnostic trouble codes and verify the repair by test-driving and monitoring live data.
If the code persists, check for technical service bulletins or software updates for the control module.

Don't Replace the Charger Before Checking This

A common oversight is assuming the charger itself is defective when the real issue is a chafed wire harness causing a short to voltage, which is often easier and cheaper to fix.
The code can be set by a weak or failing 12-volt battery that causes erratic sensor readings, so always load-test the battery before condemning the charger.
In some vehicles, the input current sensor is integrated into the charger assembly and cannot be replaced separately, but aftermarket repair kits may exist for certain models.
Intermittent codes often stem from poor ground connections at the charger mounting points, which are frequently overlooked during diagnosis.
A scan tool that can graph live sensor data is invaluable for catching intermittent glitches that a simple code reader cannot reveal.

Can I keep driving with P2D84?

If the only symptom is the warning light and the vehicle drives normally, you can continue driving but should schedule a diagnosis soon to avoid a potential no-start condition. Avoid using the battery charger until the fault is repaired, as continued operation with a high current fault could damage the charger or other electrical components.

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.