P0677 on Chevrolet
Cylinder 7 Glow Plug Circuit
P0677 on Chevrolet vehicles indicates cylinder 7 glow plug circuit. Au7o has documented this code across 1 Chevrolet model — most commonly on Express. A fault in the glow plug/heater circuit for cylinder 7. The control module detected an open or short in that individual glow plug circuit. Typical repair costs on Chevrolet range from $300 to $1,800, depending on the specific model and root cause.
Common Causes of P0677
- •Faulty cylinder 7 glow plug
- •Open or short in the glow plug circuit
- •Corroded/damaged connector
- •Wiring damage
- •Glow plug module fault
P0677 on Chevrolet by Model
Chevrolet Express(1 issue)
- 6.6L Duramax LGH Glow Plug and Glow Plug Control Module Failure2011-2016
The 6.6L Duramax LGH offered in Express 2500/3500/4500 vans from 2011 to 2016 has a well-documented glow plug system weakness. Individual glow plugs fail open, and the glow plug control module itself develops open-driver and no-power-to-glow-plug faults - a failure mode common enough that specialist board-repair houses list the 2011-2016 Chevrolet Express 6.6L LGH GPCM as a standing repair line. GM issued a service bulletin covering 2011-2012 Express vans with the LGH and LML Duramax where the malfunction indicator lamp illuminates for glow plug faults; the bulletin notes there is usually no drivability complaint in mild weather, but harder cold starting may be present. In practice owners in cold climates get extended cranking, white startup smoke and a rough first minute of running, plus a persistent MIL that will fail an inspection. Do not confuse this with the 2023+ Express, which uses the completely different 6.6L L5P Duramax and whose injector-related complaints are their own story.
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View P0677 across all makes →Frequently Asked Questions
What does P0677 mean on Chevrolet?▼
P0677 stands for "Cylinder 7 Glow Plug Circuit." A fault in the glow plug/heater circuit for cylinder 7. The control module detected an open or short in that individual glow plug circuit. On Chevrolet specifically, this code is documented across 1 model.
What causes P0677 on Chevrolet vehicles?▼
Common causes on Chevrolet: Faulty cylinder 7 glow plug, Open or short in the glow plug circuit, Corroded/damaged connector, Wiring damage, Glow plug module fault. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0677 on a Chevrolet?▼
Repair costs on Chevrolet range from $300 to $1,800, depending on the specific model and root cause.
Which Chevrolet models have P0677 documented?▼
Au7o has documented P0677 on 1 Chevrolet model: Express.