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 lead to hard starting, misfires, and increased emissions, especially in cold weather.
01. Most Common Causes
- Faulty glow plug in cylinder 5
- Open or shorted wiring in the glow plug circuit
- Blown fuse or relay for the glow plug system
- Faulty glow plug control module
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Hard starting, especially in cold weather
- Rough idle or misfire on cylinder 5
- Increased exhaust smoke during startup
03. 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 (should be low, typically 0.5-2 ohms).
Step 4: Check for voltage at the glow plug connector with the key on (should see battery voltage for a few seconds).
Step 5: If voltage is present and glow plug is good, inspect the glow plug control module and related fuses/relays.
04. Commonly Affected Makes
05. 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 may cause misfires and damage the catalytic converter. It's best to repair promptly.
How much does it cost to fix?▼
Typically $50-$150 for a single glow plug replacement, including parts and labor. Costs may be higher if wiring or control module needs repair.