Loose, corroded, or damaged wiring or connector pins at the current sensor or charger; Faulty current sensor internal electronics causing an erratic signal; Poor ground connection for the charger or sensor circuit; Water intrusion or corrosion in the sensor or charger connector; Failing battery charger module producing unstable current; Software glitch in the powertrain control module affecting signal interpretation

DTC codes / P0Exx · Hybrid propulsion / P0E8E

P0E8EBattery Charger B Current Sensor Circuit Intermittent/Erratic

P0E8E indicates that the powertrain control module has detected an intermittent or erratic signal from the current sensor that monitors the battery charger's output. The sensor's feedback is used to regulate charging current, so a fluctuating signal prevents the module from accurately controlling the charger.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaHybrid propulsion

Symptoms you may notice

Illumination of the check engine light or service vehicle soon message
Often no symptoms besides the warning light
Inconsistent or slow battery charging, especially noticeable on plug-in hybrid models
A battery warning light may appear if the charger cannot maintain the auxiliary battery
Reduced electric-only range or longer charging times on plug-in hybrids
Possible electrical accessories behaving erratically if system voltage fluctuates

Common causes, most likely first

Loose, corroded, or damaged wiring or connector pins at the current sensor or charger
Faulty current sensor internal electronics causing an erratic signal
Poor ground connection for the charger or sensor circuit
Water intrusion or corrosion in the sensor or charger connector
Failing battery charger module producing unstable current
Software glitch in the powertrain control module affecting signal interpretation

How to diagnose and fix it

Inspect and clean the current sensor connector and charger wiring for corrosion or looseness
Check the sensor ground circuit for continuity and secure attachment
Measure the sensor signal with a multimeter or oscilloscope to confirm erratic output
Compare live sensor data on a scan tool with actual charging current to verify the fault
Replace the current sensor if its signal is confirmed erratic
Reprogram or update the powertrain control module if a known software issue exists
Replace the battery charger module if it is the source of unstable current

When the sensor is not the culprit

A loose ground or corroded connector pin often mimics a failed current sensor, so always perform a voltage drop test before replacing parts.
The code can set intermittently due to vibration or temperature changes, making it difficult to reproduce during a short test drive.
On some vehicles, a weak auxiliary battery can cause voltage fluctuations that confuse the charger current sensor and set this code.
Aftermarket electrical accessories wired into the charging circuit can introduce noise that the sensor interprets as erratic current.
Clearing the code without addressing the underlying connection issue often leads to a quick return of the fault.

Can I keep driving with P0E8E?

The vehicle is generally safe to drive because the fault affects charging regulation rather than immediate safety systems, but avoid long trips that rely heavily on charging and address the issue promptly to prevent battery drain or 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.