BodyB0940

Caution

Severity: Caution - get it checked when you can

Coolant level sensor circuit open

3 brands affected · Description from GM data.

Key terms: Control module: a small computer that runs one part of the car

Safety: This code relates to engine cooling or temperature. Overheating can damage the engine.

1What it means in plain English

The coolant level sensor circuit is open, so a low-coolant warning may not be shown.

2Common causes

Faulty coolant level sensor
Damaged or disconnected wiring
Corroded connector
Low coolant level or a coolant leak
Body control module fault

3Can I drive?

Caution · drive with care

Do not rely on the coolant warning light. Check the coolant level when the engine is cold and have the sensor diagnosed soon; stop safely if the engine overheats.

This page gives general information. It is not professional advice. For a definite diagnosis and a repair quote, ask a qualified mechanic to inspect the car.

4Brand data 3

Brand	Code	Description	System
Ford	B0940	No description available	Body
GM	B0940	Coolant level sensor circuit open Brand	Body
Saab	B0940	Coolant Level Sensor Circuit Open Brand	Body

Legend: SAE is the generic J2012 description; Brand is text taken from that manufacturer’s data. Manufacturer rows keep the wording and language of the source data, and non-English text is tagged so screen readers pronounce it correctly.

5Related codes

Browse Bxxx codes or B094xx codes.