P0672 on Mercedes-Benz
Cylinder 2 Glow Plug Circuit
P0672 on Mercedes-Benz vehicles indicates cylinder 2 glow plug circuit. Au7o has documented this code across 1 Mercedes-Benz model — most commonly on Sprinter. 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 Mercedes-Benz range from $300 to $1,500, 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 Mercedes-Benz by Model
Mercedes-Benz Sprinter(1 issue)
- Glow Plug Failure and Cold Start Issues2007-2025
Sprinter glow plugs fail with age, causing hard starting in cold weather, rough idle when cold, and white smoke on startup. The OM642 V6 is particularly prone to glow plug seizure in the cylinder head, making removal difficult and risking broken glow plugs that require cylinder head removal to extract.
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View P0672 across all makes →Frequently Asked Questions
What does P0672 mean on Mercedes-Benz?▼
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 Mercedes-Benz specifically, this code is documented across 1 model.
What causes P0672 on Mercedes-Benz vehicles?▼
Common causes on Mercedes-Benz: 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 Mercedes-Benz?▼
Repair costs on Mercedes-Benz range from $300 to $1,500, depending on the specific model and root cause.
Which Mercedes-Benz models have P0672 documented?▼
Au7o has documented P0672 on 1 Mercedes-Benz model: Sprinter.