P0679

Cylinder 9 Glow Plug Circuit/Open

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$22–67 (est.)

Symptoms

Difficulty starting a multi-cylinder diesel engine in cold weather
Check Engine Light
White smoke on cold start
Unstable engine operation after starting
Glow plug indicator

Causes

Burnt out glow plug cylinder 9
Broken power wire
Oxidation or damage to the connector
GPCM module malfunction
Wiring damage

How to Fix

Read OBD-II error codes
Measure the resistance of the spark plug of cylinder 9 (standard: 0.5–2 Ohm)
Inspect the wiring and connector
Check supply voltage
Replace a faulty glow plug
If the error occurs again - GPCM diagnostics

Related codes

P0678 P0680 P0670