Cylinder 9 Glow Plug Circuit Range/Performance
The P06C1 code indicates that the Engine Control Module (ECM) has detected a malfunction in the glow plug circuit for cylinder 9. This typically means the glow plug resistance is out of the expected range, or the circuit has an open or short. Glow plugs are essential for cold starts in diesel engines; a faulty circuit can cause hard starting, misfires, and increased emissions.
01. Most Common Causes
- Faulty glow plug in cylinder 9
- Open or short in the glow plug wiring or connector
- Failed glow plug relay or control module
- Corrosion or damage in the glow plug harness
02. Symptoms You Will Notice
- Hard starting, especially in cold weather
- Engine misfire or rough idle
- Check Engine Light illuminated
- Reduced fuel economy
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm the code and check for related codes.
Step 2: Visually inspect the glow plug wiring and connector for cylinder 9 for damage or corrosion.
Step 3: Measure the resistance of the glow plug for cylinder 9; compare to manufacturer specs (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 9.
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, especially in cold weather, as it can cause hard starting, engine misfire, and potential damage to the catalytic converter or other components.
How much does it cost to fix?▼
The cost to fix P06C1 typically ranges from $50 to $150, including parts (glow plug) and labor. If wiring or relay replacement is needed, costs may be higher.