P0671 Volvo Cylinder 1 Glow Plug Circuit Fault

Possible causes

– Faulty cylinder #1 glow plug
– Cylinder #1 glow plug harness is open or shroted
– Cylinder #1 glow plug circuit poor electrical connection
– Faulty glow plug module

What about the obd code?

The Engine Control Module (ECM) has detected a fault in the cylinder #1 glow plug circuit

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)
– Lack/Loss of Power
– The engine may be harder to start
– Engine hesitation