P0684 — Glow Plug Control Module to PCM Communication Circuit Range/Performance

Q: What does fault code P0684 mean?

P0684 means: Glow Plug Control Module to PCM Communication Circuit Range/Performance. It is a Powertrain (engine/transmission) fault code defined by the OBD-II standard.

Q: Can I keep driving with P0684?

With P0684 you can usually drive home and book an inspection within a few days unless the car feels abnormal.

Powertrain (engine/transmission)

Glow Plug Control Module to PCM Communication Circuit Range/Performance

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Can I drive with P0684?

You can usually drive home and book an inspection within a few days.

Frequently asked questions

What does fault code P0684 mean?

P0684 means Glow Plug Control Module to PCM Communication Circuit Range/Performance.

Can I keep driving with P0684?

You can usually drive home and book an inspection within a few days.

Related fault codes

P0680 — Cylinder 10 Glow Plug Circuit
P0681 — Cylinder 11 Glow Plug Circuit
P0682 — Cylinder 12 Glow Plug Circuit
P0683 — Glow Plug Control Module to PCM Communication Circuit
P0685 — ECM/PCM Power Relay Control Circuit /Open
P0686 — ECM/PCM Power Relay Control Circuit Low
P0687 — ECM/PCM Power Relay Control Circuit High
P0688 — ECM/PCM Power Relay Sense Circuit /Open
P0689 — ECM/PCM Power Relay Sense Circuit Low

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