Cylinder 5 Glow Plug Control Circuit High
The P067D code indicates that the powertrain control module (PCM) has detected a high voltage condition in the glow plug control circuit for cylinder 5. 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.
1. Most Common Causes
- Faulty glow plug in cylinder 5
- Open or shorted wiring in the glow plug circuit
- Corroded or damaged connector at the glow plug
- Failed glow plug control module
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Hard starting, especially in cold weather
- Rough idle or misfire on cylinder 5
- Excessive smoke from exhaust during startup
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm the code and check for other related codes.
Step 2: Visually inspect the glow plug wiring and connector for cylinder 5 for damage or corrosion.
Step 3: Measure resistance of the glow plug; compare to specifications (typically 0.5-2 ohms).
Step 4: Check voltage at the glow plug connector with key on; should be battery voltage during glow cycle.
Step 5: If wiring and plug are good, test the glow plug control module output for cylinder 5.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances, as a faulty glow plug can cause hard starting, poor fuel economy, and potential engine damage if the cylinder misfires.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for a single glow plug replacement, including parts and labor. If the control module or wiring needs repair, costs can be higher.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.