P0670: Glow plug control module circuit

What does it mean?

System

Powertrain (engine and transmission)

Subsystem

Control module and outputs

Type of code

Generic code: means the same on every make.

How urgent?

Have it checked soon. You can usually still drive, but avoid long trips and heavy loads.

Possible causes

• Failed glow plug
• Glow plug relay or module
• Wiring or connector

Tip: don’t just clear the code. Clearing a code doesn’t fix the cause. It often comes back, and the stored data that helps us find the cause is then gone.