Hybspec

B1115

Wysoki

Electric water pump fault — incorrect operation of the electrically controlled cooling pump. The vehicle may not properly control the cooling system temperature.

OBD-II (EN): Electric Water Pump Malfunction

Code B1115 indicates a problem with the electric water pump in the cooling system — most commonly found in Mitsubishi vehicles (e.g., Outlander). The fault can lead to improper engine temperature management and poor cabin heating. Urgent diagnosis by a mechanic is recommended, as untreated it can lead to engine overheating.

Symptoms

- Poor cabin heating despite a warm engine - Coolant temperature warning light on the dashboard - Radiator fan runs more often or longer than normal - Possible engine overheating at low speeds or idle - Cooling system error message on the onboard computer

Possible causes

- Failure of the electric water pump motor (wear or burnt windings) - Open circuit or short circuit in the pump power/control circuit - Faulty controller (electric pump control module) - Corrosion or damage to the pump electrical connector - Faulty coolant temperature sensor sending a false signal to the ECU

Affected systems

Układ chłodzeniaElektryczna pompa wodyZarządzanie temperaturą silnikaOgrzewanie kabinySterownik silnika (ECU/BCM)

Related codes

Does code B1115 require professional diagnostics?

The code alone is not enough. To find the cause, you need to read live data, check freeze frame conditions, and compare with vehicle behavior. Book a diagnostic session.