Code Definition

P0670 — Glow plug control module circuit open

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P0670

P0670 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P0670 is stored, the module has detected an open (broken or disconnected) electrical path in the monitored circuit; and a signal or supply voltage lower than the expected operating range.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0670 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The fault code P0670 is set when the Engine Control Module (ECM) detects an open circuit condition in the glow plug control module. This module is responsible for controlling the operation of the glow plugs in a diesel engine. Glow plugs are used to heat the engine's cylinders to facilitate starting, especially in cold conditions. An open circuit in the glow plug control module indicates a break or disconnection in the electrical pathway that controls the glow plugs. This can lead to difficulties in starting the engine, particularly in cold weather, as the glow plugs may not receive the necess...

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