Cylinder 6 Glow Plug Control Circuit High
The P067F code indicates that the powertrain control module (PCM) has detected a high 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 cold starts. A high voltage reading suggests a short to power, a faulty glow plug, or a problem with the glow plug control module. This issue can cause hard starting, misfires, and increased emissions, especially in cold weather.
1. Most Common Causes
- Faulty glow plug in cylinder 6
- Short to voltage in the glow plug wiring harness
- Failed glow plug control module
- Corroded or damaged connector at the glow plug
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Hard starting, especially in cold weather
- Engine misfire on cylinder 6
- Rough idle or poor engine performance
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data to confirm P067F.
Step 2: Visually inspect the glow plug wiring and connector for cylinder 6 for damage, corrosion, or shorts.
Step 3: Measure resistance of glow plug 6; compare to specification (typically 0.5-2 ohms).
Step 4: Check voltage at glow plug connector with key on; should be battery voltage. If high, trace short to power.
Step 5: Test glow plug control module output for cylinder 6; replace if faulty.
4. 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, misfires, and potential damage to the glow plug system or engine. Have it diagnosed and repaired promptly.
How much does it cost to fix?▼
The cost to fix P067F typically ranges from $50 to $150, including parts (glow plug) and labor. If the control module needs replacement, costs may be higher.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.