Faulty battery temperature sensor K itself, reading low resistance or open; Damaged or corroded wiring harness between the sensor and the battery control module; Poor electrical connection at the sensor connector or module connector; Short to ground on the sensor signal circuit; Failed battery energy control module (less common); Internal battery pack damage affecting sensor mounting or wiring

DTC codes / P0Cxx · Hybrid propulsion / P0C94

P0C94Hybrid/EV Battery Temperature Sensor K Circuit Low

Q: What does code P0C94 mean?

Hybrid/EV Battery Temperature Sensor K Circuit Low. P0C94 indicates that the hybrid or electric vehicle battery pack's temperature sensor K is reporting a voltage below the normal operating range to the battery energy control module. The computer detects this as a low signal on the sensor's circuit, which typically means the sensor is reading colder than expected or the circuit has a short to ground or an open connection.

P0C94 indicates that the hybrid or electric vehicle battery pack's temperature sensor K is reporting a voltage below the normal operating range to the battery energy control module. The computer detects this as a low signal on the sensor's circuit, which typically means the sensor is reading colder than expected or the circuit has a short to ground or an open connection.

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 electric driving range or forced engine operation in a hybrid
Battery cooling fan running continuously or not at all
Charging system may be disabled or limited on plug-in models
Often no symptoms besides the warning light
Possible reduced power output or limp mode in severe cases

Common causes, most likely first

Faulty battery temperature sensor K itself, reading low resistance or open
Damaged or corroded wiring harness between the sensor and the battery control module
Poor electrical connection at the sensor connector or module connector
Short to ground on the sensor signal circuit
Failed battery energy control module (less common)
Internal battery pack damage affecting sensor mounting or wiring

How to diagnose and fix it

Use a scan tool to read live data from all battery temperature sensors and compare sensor K to the others
Visually inspect the sensor K wiring and connector for damage, corrosion, or loose pins
Disconnect the sensor and measure its resistance, comparing to the manufacturer's temperature-resistance chart
Check the signal circuit for a short to ground using a multimeter with the sensor disconnected
Repair or replace any damaged wiring or connector terminals as needed
Replace the battery temperature sensor K if it fails resistance testing
Clear the code and verify the repair by test-driving and monitoring live data

What most techs miss on P0C94

A low voltage reading on a temperature sensor circuit often comes from a poor ground connection at the sensor body rather than a failed sensor, so check ground integrity before condemning the part.
On many hybrid packs, sensor K is part of a daisy-chained harness inside the battery assembly, and a single chafed wire can affect multiple sensors or set companion codes.
The battery control module may substitute a default temperature value when sensor K fails, masking the fault and allowing the vehicle to drive normally until the next key cycle.
After replacing a sensor, some vehicles require a battery pack temperature relearn or calibration procedure using a scan tool, otherwise the code may return immediately.
A weak 12-volt auxiliary battery can cause erratic sensor readings and set this code on some hybrids, so always verify system voltage stability first.

Can I keep driving with P0C94?

You can usually drive the vehicle short distances to a repair shop, but avoid heavy acceleration, long trips, or aggressive charging until the fault is fixed. Continued driving with a faulty battery temperature sensor may cause the hybrid system to disable or reduce power unexpectedly.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

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