P0670 — Glow Plug Control Module 1 Control Circuit/Open

P0670: Concerns the control circuit of glow-plug control module 1, including an open-circuit condition.

Meaning, symptoms, causes and checks

Concerns the control circuit of glow-plug control module 1, including an open-circuit condition. The definition does not identify a single cylinder's glow plug.

Affected system: Glow-plug control

Symptoms

  • Hard cold starting; white smoke and initial uneven running.

Possible causes

  • Faulty module/relay, blown fuse or damaged circuit.

What to check

  • Check fuse, connections, grounds and ECU-to-glow-module circuit.

Also written as: P0670-00, P067000, PO670 (some scan tools add the fault-type byte, e.g. -00).