OBD-II Fault Code

B2380: Heater Coolant Temp sensor circuit Short to GND

Meaning, symptoms, likely causes, diagnostic checks and repair guidance for B2380.

System family

Body

Generic/SAE

Repair category

Cooling system

Use this category to narrow your checks before replacing parts.

Severity

High

Severity is a general guide. Confirm with scan-tool data and vehicle symptoms.

What B2380 usually means

Heater Coolant Temp sensor circuit Short to GND.

Common symptoms

Body/accessory warning lamp or feature not working; Temperature gauge abnormal; Overheating or slow warm-up possible

Likely causes

Low coolant; Faulty thermostat; Coolant temperature sensor/wiring fault; Cooling fan issue

Diagnostic checks

Check related fuses, connectors, grounds and switch/module power supply; Check coolant level only when engine is cool; Compare scan-tool temperature to actual temperature

Repair guidance

Repair leaks, replace thermostat/sensor/fan component after confirming fault

Verification after repair

Operate the affected body/accessory system and rescan

Note: Never open hot cooling system cap. A DTC identifies a circuit or system condition, not always the failed part.