Cylinder 3 Glow Plug Circuit Range/Performance
The P06BB code indicates that the Engine Control Module (ECM) has detected a malfunction in the glow plug circuit for cylinder 3. This typically means the glow plug resistance or current draw is outside the expected range, or the circuit has an open or short. Glow plugs are critical for cold starts in diesel engines, and a fault can cause hard starting, misfires, and increased emissions.
01. Most Common Causes
- Faulty glow plug in cylinder 3
- Open or short in glow plug wiring or connector
- Failed glow plug relay or fuse
- ECM issue or software glitch
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 3 for damage or corrosion.
Step 3: Measure resistance of glow plug cylinder 3; compare to spec (typically 0.5-2 ohms).
Step 4: Test glow plug relay and fuse for proper operation.
Step 5: If wiring and relay are OK, replace glow plug cylinder 3.
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, misfires, and potential damage to the engine or catalytic converter.
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 wiring or relay replacement is needed, costs may be higher.