Cylinder 5 Glow Plug Circuit Malfunction
The P0675 code indicates a fault in the glow plug circuit for cylinder 5. Glow plugs are used in diesel engines to preheat the combustion chamber for cold starts. When the powertrain control module (PCM) detects an open or short circuit in the glow plug or its wiring for cylinder 5, it sets this code. This can cause hard starting, misfires, and increased emissions, especially in cold weather.
1. Most Common Causes
- Faulty or open glow plug in cylinder 5
- Defective glow plug relay
- Short, open, or poor connection in the glow plug circuit wiring
- Corroded or loose terminal connector at cylinder 5 glow plug
- Failed glow plug control module
- Damaged engine control module (ECM) - uncommon
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Hard starting, especially in cold weather
- Engine misfire or rough idle
- Excessive smoke from exhaust on startup
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm code P0675 and check for other related codes.
Step 2: Visually inspect the glow plug wiring and connector for cylinder 5 for damage or corrosion.
Step 3: Test the glow plug resistance with a multimeter (typically 0.5-2 ohms).
Step 4: Check the glow plug relay and fuse for proper operation.
Step 5: If wiring and relay are good, replace the glow plug for cylinder 5.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
You can drive short distances, but starting may be difficult in cold weather. Prolonged driving can cause misfires and damage the catalytic converter. It's best to repair promptly.
How much does it cost to fix?▼
Typically $50-$150 for parts and labor. A single glow plug costs $20-$50, and labor is about $30-$100 depending on accessibility.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.