P0672 on Chevrolet
Cylinder 2 Glow Plug Circuit
P0672 on Chevrolet vehicles indicates cylinder 2 glow plug circuit. Au7o has documented this code across 2 Chevrolet models — most commonly on Express, Silverado 3500HD. P0672 is a diesel-engine code indicating a fault in the glow plug circuit for cylinder number 2. Glow plugs heat the combustion chamber to help a diesel engine start, especially in cold weather, and the control module monitors each plug's circuit electrically. When it detects an open, short, or out-of-range condition on the cylinder 2 glow plug circuit, it sets this code. It generally causes hard cold starts, rough running until warm, and possibly white smoke on startup, while the check engine or glow plug light may illuminate. Typical repair costs on Chevrolet range from $200 to $1,800, depending on the specific model and root cause.
Common Causes of P0672
- •Failed (open or shorted) glow plug on cylinder 2
- •Corroded or loose glow plug connector/terminal
- •Damaged or broken glow plug wiring/harness
- •Faulty glow plug control module or relay
- •High resistance/corrosion at the glow plug bus bar or strap
- •Poor ground connection in the glow plug circuit
- •Blown fuse feeding the glow plug circuit
P0672 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.
Chevrolet Silverado 3500HD(1 issue)
- Glow Plug Failure and Hard Cold Starting2001-2020
Glow plugs fail causing difficult cold weather starting. Can also swell and break during removal, requiring extraction. Glow plug module can also fail.
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View P0672 across all makes →Frequently Asked Questions
What does P0672 mean on Chevrolet?▼
P0672 stands for "Cylinder 2 Glow Plug Circuit." P0672 is a diesel-engine code indicating a fault in the glow plug circuit for cylinder number 2. Glow plugs heat the combustion chamber to help a diesel engine start, especially in cold weather, and the control module monitors each plug's circuit electrically. When it detects an open, short, or out-of-range condition on the cylinder 2 glow plug circuit, it sets this code. It generally causes hard cold starts, rough running until warm, and possibly white smoke on startup, while the check engine or glow plug light may illuminate. On Chevrolet specifically, this code is documented across 2 models.
What causes P0672 on Chevrolet vehicles?▼
Common causes on Chevrolet: Failed (open or shorted) glow plug on cylinder 2, Corroded or loose glow plug connector/terminal, Damaged or broken glow plug wiring/harness, Faulty glow plug control module or relay, High resistance/corrosion at the glow plug bus bar or strap. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0672 on a Chevrolet?▼
Repair costs on Chevrolet range from $200 to $1,800, depending on the specific model and root cause.
Which Chevrolet models have P0672 documented?▼
Au7o has documented P0672 on 2 Chevrolet models: Express, Silverado 3500HD.