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 failed glow plug control module. This code is specific to diesel engines and can lead to hard starting, rough idle, and increased emissions.
01. Most Common Causes
- Faulty glow plug in cylinder 5
- Open or shorted glow plug wiring or connector
- Failed glow plug control module
- Corrosion or damage in the glow plug circuit
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Hard starting, especially in cold weather
- Rough idle or misfire
- Reduced fuel economy
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect glow plug wiring and connector at cylinder 5 for damage or corrosion.
Step 3: Measure resistance of glow plug at cylinder 5; compare to specifications (typically 0.5-2 ohms).
Step 4: Check voltage at glow plug connector with key on; should be battery voltage during glow cycle.
Step 5: Test glow plug control module output for cylinder 5 circuit.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
You can drive short distances, but it may cause hard starting and increased emissions. Prolonged driving can damage the glow plug system or engine.
How much does it cost to fix?▼
Typically $50-$150 for a glow plug replacement, plus diagnostic fees. Control module replacement can cost $200-$500.