Cylinder 6 Glow Plug Control Circuit Low
The P067E code indicates that the powertrain control module (PCM) has detected a low voltage condition in the glow plug control circuit for cylinder 6. This circuit supplies power to the glow plug, which preheats the combustion chamber for easier cold starts in diesel engines. A low voltage reading suggests excessive resistance, a short to ground, or a faulty component, preventing the glow plug from reaching proper temperature and potentially causing hard starting, misfires, or increased emissions.
1. Most Common Causes
- Faulty glow plug in cylinder 6
- Open or shorted wiring in the glow plug control circuit
- Corroded or loose connector at the glow plug
- Failed glow plug control module or relay
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Hard starting, especially in cold weather
- Rough idle or misfire on cylinder 6
- Reduced fuel economy and increased exhaust smoke
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm code P067E and check for related codes.
Step 2: Visually inspect the glow plug wiring and connector for cylinder 6 for damage, corrosion, or looseness.
Step 3: Measure resistance of the glow plug; typically 0.5-2 ohms. Replace if out of spec.
Step 4: Test voltage at the glow plug connector with key on; should be battery voltage. If low, check circuit back to control module.
4. 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 may cause hard starting, poor engine performance, and potential damage to the catalytic converter from unburned fuel.
How much does it cost to fix?▼
The typical repair cost ranges from $50 to $150, including parts (glow plug) and labor. If wiring or control module replacement is needed, costs can be higher.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.