Cylinder 8 Glow Plug Incorrect
The P06CC code indicates that the Engine Control Module (ECM) has detected an incorrect glow plug in cylinder 8. This typically means the glow plug resistance or type does not match the expected specifications for that cylinder. Glow plugs are used in diesel engines to preheat the combustion chamber for cold starts. An incorrect glow plug can cause hard starting, misfires, and increased emissions.
01. Most Common Causes
- Wrong glow plug installed (incorrect resistance or type)
- Faulty glow plug (open or short circuit)
- Wiring or connector issue at cylinder 8 glow plug
- ECM programming error or fault
02. Symptoms You Will Notice
- Hard starting, especially in cold weather
- Check Engine Light illuminated
- Rough idle or misfire on cylinder 8
- Reduced fuel economy
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect glow plug wiring and connector at cylinder 8 for damage or corrosion.
Step 3: Measure resistance of cylinder 8 glow plug and compare to manufacturer specifications (typically 0.5-2 ohms).
Step 4: If resistance is out of spec, replace the glow plug with the correct OEM part.
Step 5: Clear codes and test drive to confirm repair.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with this code, as it can cause hard starting and potential engine damage if the glow plug fails completely.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for parts and labor, depending on vehicle make and model.