Will Low Coolant Cause Check Engine Light to Come On?
Yes, low coolant will cause your check engine light (CEL) to come on. When coolant drops below required levels, air pockets form in the engine, causing the Engine Coolant Temperature (ECT) sensor to detect rapid thermal spikes above 105°C to 110°C (221°F to 230°F) or causing the Coolant Level Sensor to read a fluid deficit. […]