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 typically means the circuit has excessive resistance or a short to voltage, preventing the glow plug from operating correctly. Common causes include a faulty glow plug, damaged wiring or connector, or a malfunctioning glow plug control module.
01. Most Common Causes
- Faulty glow plug in cylinder 6
- Open or shorted wiring in the glow plug circuit
- Corroded or damaged connector at the glow plug
- Failed glow plug control module
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Hard starting, especially in cold weather
- Rough idle or misfire on cylinder 6
- Excessive smoke from exhaust during startup
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect the glow plug wiring and connector for cylinder 6 for damage or corrosion.
Step 3: Measure resistance of the glow plug; should be low (0.5-2 ohms). High resistance indicates a bad glow plug.
Step 4: Check voltage at the glow plug connector with key on; should be battery voltage. If not, test the control circuit back to the module.
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 a failed glow plug can cause hard starting, increased emissions, and potential engine damage if the cylinder misfires.
How much does it cost to fix?▼
The cost to fix P067F typically ranges from $50 to $150 for a DIY glow plug replacement, or $150 to $400 if professional labor is required.