Open or damaged wire in the sensor K signal circuit, often from chafing or rodent damage; Corroded, loose, or disconnected electrical connector at the sensor or at the battery control module; Failed temperature sensor K inside the high-voltage battery pack; High resistance in a splice or terminal within the sensor circuit; Faulty battery energy control module not reading the sensor correctly; Moisture intrusion into the sensor connector or wiring harness; A short to voltage on the sensor signal circuit, though this is less common than an open circuit

DTC codes / P0Cxx · Hybrid propulsion / P0C95

P0C95Hybrid/EV Battery Temperature Sensor K Circuit High

Q: What does code P0C95 mean?

Hybrid/EV Battery Temperature Sensor K Circuit High. P0C95 means the hybrid or electric vehicle battery pack's temperature sensor K is reporting a voltage above the normal range to the battery energy control module. The computer sees a high signal on that sensor circuit, which usually indicates an open circuit, a poor connection, or a sensor that has failed internally.

P0C95 means the hybrid or electric vehicle battery pack's temperature sensor K is reporting a voltage above the normal range to the battery energy control module. The computer sees a high signal on that sensor circuit, which usually indicates an open circuit, a poor connection, or a sensor that has failed internally.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaHybrid propulsion

Symptoms you may notice

Illumination of the hybrid system warning light or service vehicle soon message
Often no symptoms besides the warning light, especially if the fault is intermittent
Reduced electric-only driving range or the vehicle refusing to enter EV mode
A message on the dash stating the hybrid battery is too hot or temperature unavailable
Possible reduced engine power or limp-home mode in some vehicles
The battery cooling fan may run continuously or not at all

Common causes, most likely first

Open or damaged wire in the sensor K signal circuit, often from chafing or rodent damage
Corroded, loose, or disconnected electrical connector at the sensor or at the battery control module
Failed temperature sensor K inside the high-voltage battery pack
High resistance in a splice or terminal within the sensor circuit
Faulty battery energy control module not reading the sensor correctly
Moisture intrusion into the sensor connector or wiring harness
A short to voltage on the sensor signal circuit, though this is less common than an open circuit

How to diagnose and fix it

Scan all modules for codes and record freeze-frame data to confirm when the high voltage was set
Visually inspect the sensor K wiring and connector for damage, corrosion, or loose pins
Measure resistance of the sensor K circuit at the battery control module connector and compare to specifications
Check for continuity and resistance to ground on the signal and return circuits to rule out an open or short
If wiring checks pass, remove and test the sensor K with a multimeter across a known temperature range
Replace the faulty sensor or repair the damaged harness section, then clear codes and verify the reading matches other temperature sensors
If the sensor and wiring are good, follow the manufacturer's diagnostic flow for the battery control module before replacing it

What a high sensor K reading really means

A high voltage on a temperature sensor circuit almost always means an open circuit, not a genuinely hot battery, because a disconnected sensor pulls the signal line high.
Technicians often replace the battery pack temperature sensor only to find the real fault is a corroded pin in the harness connector behind the rear seat or under the vehicle.
This code can be set by a faulty battery cooling fan that causes the pack to overheat, so always check fan operation and cooling ducts before condemning the sensor.
Intermittent P0C95 codes often appear after driving over rough roads or in wet weather, pointing to a chafed wire that only opens under vibration or moisture.
Some vehicles use a single sensor for multiple cells, so a high reading on sensor K can be caused by a failed sensor elsewhere in the same circuit string.

Can I keep driving with P0C95?

You can usually drive the vehicle with this code, but avoid heavy acceleration, long grades, and fast charging until it is repaired because the battery management system may not be able to protect the pack from overheating. If the dash displays a high battery temperature warning or the vehicle enters limp mode, stop and have it towed.

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.