Faulty battery pack voltage sensor on the 'E' circuit; Damaged or corroded wiring or connector at the voltage sensor; Open or short circuit in the voltage sense circuit; High-voltage battery pack internal fault, such as a weak cell or module; Battery energy control module (BECM) software issue or internal failure; Loose or improper connection at the battery pack terminals

DTC codes / P0Exx · Hybrid propulsion / P0E46

P0E46Hybrid/EV Battery Pack Voltage Sense E Circuit Low

Q: What does code P0E46 mean?

Hybrid/EV Battery Pack Voltage Sense E Circuit Low. P0E46 indicates that the hybrid or electric vehicle battery pack voltage sensing circuit, specifically the 'E' circuit, is reporting a voltage lower than the expected range to the battery energy control module. The computer detects this when the signal from the voltage sensor falls below a calibrated threshold for a set time, which can be caused by a faulty sensor, wiring issue, or internal battery pack problem.

P0E46 indicates that the hybrid or electric vehicle battery pack voltage sensing circuit, specifically the 'E' circuit, is reporting a voltage lower than the expected range to the battery energy control module. The computer detects this when the signal from the voltage sensor falls below a calibrated threshold for a set time, which can be caused by a faulty sensor, wiring issue, or internal battery pack problem.

SystemPowertrain

Code typeGeneric (all makes)

SeverityHigh

Fix difficultyProfessional

AreaHybrid propulsion

Symptoms you may notice

Illumination of the check engine light or hybrid system warning light
Often no symptoms besides the warning light
Reduced hybrid system power or limited electric-only operation
Inability to start the vehicle or enter 'Ready' mode
Inaccurate state-of-charge or range display
Possible charging system faults or failure to accept a charge

Common causes, most likely first

Faulty battery pack voltage sensor on the 'E' circuit
Damaged or corroded wiring or connector at the voltage sensor
Open or short circuit in the voltage sense circuit
High-voltage battery pack internal fault, such as a weak cell or module
Battery energy control module (BECM) software issue or internal failure
Loose or improper connection at the battery pack terminals

How to diagnose and fix it

Perform a visual inspection of the battery pack voltage sensor and its wiring for damage or corrosion
Check for technical service bulletins (TSBs) or software updates for the BECM
Use a scan tool to read live data from the voltage sensor and compare with actual measured voltage
Test the voltage sense circuit for continuity and resistance to identify opens or shorts
Verify the sensor's reference voltage and ground circuits are intact
If the sensor is faulty, replace it following manufacturer procedures
If the circuit and sensor are good, diagnose the battery pack and BECM as per service information

Voltage Sense Circuit Low: Common Oversights

A loose or corroded connector at the battery pack voltage sensor is a frequent cause that is often overlooked during diagnosis.
The code can be set by a weak 12-volt auxiliary battery causing low reference voltage to the BECM, so always check the 12-volt system first.
After repairs, the BECM may require a relearn or calibration procedure to clear the code and restore accurate voltage sensing.
This code does not always indicate a failing high-voltage battery; simple wiring faults are common and should be ruled out before condemning the pack.
In some vehicles, the voltage sensor is integrated into the battery pack and cannot be serviced separately, requiring pack replacement if faulty.

Can I keep driving with P0E46?

It is not safe to continue driving with this code because it can lead to a sudden loss of hybrid power or a no-start condition. Have the vehicle inspected by a qualified technician as soon as possible, and avoid long trips or high-load driving until repaired.

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.