Cylinder 10 Glow Plug Control Circuit High
The P069D code indicates that the engine control module (ECM) has detected a high voltage condition in the glow plug control circuit for cylinder 10. This typically occurs when the glow plug or its wiring has a short to voltage, a faulty glow plug control module, or an open circuit. The glow plug system is critical for cold starts in diesel engines, and this fault can cause hard starting, misfires, and increased emissions.
01. Most Common Causes
- Faulty glow plug in cylinder 10
- Short to voltage in the glow plug wiring harness
- Faulty glow plug control module
- Corroded or damaged connector at the glow plug
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Hard starting, especially in cold weather
- Engine misfire or rough idle
- Reduced fuel economy
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm the code and check for related codes.
Step 2: Visually inspect the glow plug wiring and connector for cylinder 10 for damage or corrosion.
Step 3: Measure resistance of the glow plug; compare to specifications (typically 0.5-2 ohms).
Step 4: Check for voltage at the glow plug connector with key on; should be battery voltage during glow cycle.
Step 5: Test the glow plug control module output for cylinder 10.
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 it can cause hard starting and potential engine damage if the glow plug fails completely.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for parts and labor, depending on the cause and vehicle model.