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TuningBot DTC Database · v4.37.14

P0678 Cylinder 8 Glow Plug Circuit

Generic (OBD-II) interpretation in the TuningBot DTC database.

P · PowertrainIgnitionOBD2

What P0678 means

P0678
Cylinder 8 Glow Plug Circuit Generic · ignition Data confidence 90%

The control module detected improper operation of the Cylinder 8 Glow Plug circuit.

Symptoms

  • Hard cold starting possible
  • MIL or glow indicator active
  • Possible white smoke at cold start

Possible causes

  • Wiring
  • poor connection
  • relay
  • glow plug control module
  • glow plug
  • ECM

Recommended checks

  • Measure individual glow plug resistance
  • Check control module output and supply
  • Inspect wiring and connectors

Related and nearby codes

P06 range
P0600P0601P0602P0603P0604P0605P0606P0607P0608P0609P060AP060BP060CP060DP060EP060FP0610P0611

How to read P0678

P

Powertrain: engine, transmission and driveline systems.

0

Generic SAE-standard code: same meaning on every make.

678

Specific fault index within the subsystem.

Frequently asked questions about P0678

What does P0678 mean?

Cylinder 8 Glow Plug Circuit. The control module detected improper operation of the Cylinder 8 Glow Plug circuit.

Is P0678 generic or manufacturer-specific?

P0678 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.

Can TuningBot remove P0678 at file level?

If the fault logic lives in the ECU calibration, yes: our DTC Removal file service disables the specific fault entry and, where the ECU needs it, corrects the checksum too. Not sure whether your case qualifies? Request a free assessment and our engineers will check your ECU file.

Other file services

Stage 1/2/3 TuningDPF RemovalEGR RemovalAdBlue / SCR RemovalDTC RemovalIMMO OFFSpeed Limiter (Vmax)

Understand the system behind this code: Diagnostic Strategy and DTC Logic

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