P0673 on Mercedes-Benz
Cylinder 3 Glow Plug Circuit
P0673 on Mercedes-Benz vehicles indicates cylinder 3 glow plug circuit. Au7o has documented this code across 1 Mercedes-Benz model — most commonly on Sprinter. This is a diesel engine code. Glow plugs heat each cylinder's combustion chamber to make starting easier, particularly in cold conditions. P0673 means the glow plug control system detected an electrical problem in the cylinder 3 glow plug circuit — usually an open circuit, a short, or out-of-range resistance. You'll most likely notice harder cold starts, rough idle while warming up, or extra startup smoke; the glow plug warning light may also illuminate. Typical repair costs on Mercedes-Benz range from $300 to $1,500, depending on the specific model and root cause.
Common Causes of P0673
- •Failed (open or shorted) cylinder 3 glow plug
- •Damaged or corroded glow plug wiring/connector
- •Loose or corroded glow plug terminal/strap
- •Faulty glow plug relay or control module
- •Broken or chafed harness to the glow plug
- •Poor ground or low supply voltage to the circuit
P0673 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 P0673 across all makes →Frequently Asked Questions
What does P0673 mean on Mercedes-Benz?▼
P0673 stands for "Cylinder 3 Glow Plug Circuit." This is a diesel engine code. Glow plugs heat each cylinder's combustion chamber to make starting easier, particularly in cold conditions. P0673 means the glow plug control system detected an electrical problem in the cylinder 3 glow plug circuit — usually an open circuit, a short, or out-of-range resistance. You'll most likely notice harder cold starts, rough idle while warming up, or extra startup smoke; the glow plug warning light may also illuminate. On Mercedes-Benz specifically, this code is documented across 1 model.
What causes P0673 on Mercedes-Benz vehicles?▼
Common causes on Mercedes-Benz: Failed (open or shorted) cylinder 3 glow plug, Damaged or corroded glow plug wiring/connector, Loose or corroded glow plug terminal/strap, Faulty glow plug relay or control module, Broken or chafed harness to the glow plug. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0673 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 P0673 documented?▼
Au7o has documented P0673 on 1 Mercedes-Benz model: Sprinter.