Cylinder 2 Glow Plug Circuit Range/Performance
The P06BA code indicates that the engine control module (ECM) has detected a malfunction in the glow plug circuit for cylinder 2, specifically that the circuit's performance is outside the expected range. This typically means the glow plug resistance is too high or too low, or there is an open or short circuit. Glow plugs are used in diesel engines to preheat the combustion chamber for cold starts. A faulty glow plug or circuit can cause hard starting, misfires, and increased emissions.
01. Most Common Causes
- Faulty glow plug in cylinder 2
- Open or short in glow plug wiring or connector
- Failed glow plug relay or fuse
- ECM issue (rare)
02. Symptoms You Will Notice
- Hard starting, especially in cold weather
- Engine misfire or rough idle
- Check Engine Light illuminated
- 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 for cylinder 2 for damage or corrosion.
Step 3: Measure resistance of glow plug cylinder 2; compare to spec (typically 0.5-2 ohms).
Step 4: Test glow plug relay and fuse operation.
Step 5: If wiring and relay are good, replace glow plug cylinder 2.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances, especially in cold weather, as it can cause hard starting, engine damage, and increased emissions. Have it diagnosed and repaired promptly.
How much does it cost to fix?▼
Typically $50-$150 for a single glow plug replacement, including parts and labor. Costs vary by vehicle and shop.