Cylinder 5 Glow Plug Control Circuit Low
The P067C code indicates that the powertrain control module (PCM) has detected a low voltage condition in the glow plug control circuit for cylinder 5. This typically means the glow plug or its wiring has excessive resistance or a short to ground, preventing proper heating for cold starts. Common causes include a faulty glow plug, damaged wiring, or a failed glow plug control module.
01. Most Common Causes
- Faulty glow plug in cylinder 5
- Open or shorted wiring in the glow plug circuit
- Corroded or loose connector at the glow plug
- Failed glow plug control module
02. Symptoms You Will Notice
- Hard starting, especially in cold weather
- Check Engine Light illuminated
- Rough idle or misfire on cylinder 5
- Excessive white smoke from exhaust on startup
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm P067C and check for related codes.
Step 2: Visually inspect the glow plug wiring and connector for cylinder 5 for damage or corrosion.
Step 3: Measure resistance of glow plug 5; compare to specification (typically 0.5-2 ohms).
Step 4: Test voltage at the glow plug connector with key on; should be battery voltage.
Step 5: If wiring and plug are good, test the glow plug control module output for cylinder 5.
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 and potential engine damage from unburned fuel.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for a DIY glow plug replacement, or $150 to $400 if professional labor is required.