Cylinder 2 Glow Plug Circuit Malfunction
The P06C6 code indicates a problem with the glow plug circuit for cylinder 2 in a diesel engine. The glow plug is used to heat the combustion chamber for cold starts. This code is set when the Engine Control Module (ECM) detects an incorrect resistance or current draw from the glow plug, often due to a faulty glow plug, open or short circuit in the wiring, or a defective glow plug control module. This can lead to hard starting, misfires, and increased emissions.
01. Most Common Causes
- Faulty glow plug in cylinder 2
- Open or short circuit in glow plug wiring
- Corroded or loose connector at glow plug
- Defective glow plug control module
02. Symptoms You Will Notice
- Hard starting, especially in cold weather
- Engine misfire or rough idle
- Check Engine Light illuminated
- Excessive smoke from exhaust on startup
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm code P06C6 and check for other related codes.
Step 2: Visually inspect the glow plug wiring and connector at cylinder 2 for damage or corrosion.
Step 3: Measure resistance of glow plug at cylinder 2; compare to manufacturer specs (typically 0.5-2 ohms).
Step 4: Test glow plug control module output to cylinder 2 using a multimeter or test light.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances, especially in cold weather, as it can cause hard starting and increased emissions. You may be able to drive short distances if the engine starts, but have it repaired promptly.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for a single glow plug replacement, including parts and labor. If the control module or wiring needs repair, costs can be higher.