Error code
OBD2 P0671
OBD2P0671
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.
What it means
Cylinder 1 Glow Plug Circuit.
Severity
moderateCan drive, but starting issues may occur especially when cold
Summary
P0671 indicates an issue with the glow plug circuit for cylinder 1 in diesel engines. This code is set when there's a malfunction or open circuit detected by the PCM.
Symptoms
- Engine difficulty starting, especially in cold weather
- Check engine light illuminated
Common Causes
- Defective glow plug on cylinder 1
- Damaged wiring or connectors in the glow plug control circuit
- Faulty relay or timer for older systems
- Failed glow plug control module
- Corroded or disconnected connections
Diagnosis
- Inspect wiring and connectors in the glow plug circuit
- Check for corrosion or damage on the glow plug lead
- Test the glow plug control module
Fixes
- Replace faulty glow plug
FAQ
What causes P0671?
Common causes include a defective glow plug, damaged wiring or connectors, and issues with the relay or control module.
Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.
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