Cylinder 6 Glow Plug Incorrect
The P06CA code indicates that the engine control module (ECM) has detected an incorrect glow plug in cylinder 6. This typically means the glow plug resistance or current draw is out of expected range, often due to a faulty glow plug, wiring issues, or a failed glow plug control module. In diesel engines, glow plugs are critical for cold starts; an incorrect reading can lead to hard starting, misfires, and increased emissions.
01. Most Common Causes
- Faulty glow plug in cylinder 6
- Open or shorted glow plug wiring
- Failed glow plug control module
- Corrosion or poor connection at glow plug connector
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Hard starting, especially in cold weather
- Rough idle or misfire on cylinder 6
- 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 6.
Step 3: Measure glow plug resistance; compare to spec (typically 0.5-2 ohms).
Step 4: Test glow plug control module output to cylinder 6.
Step 5: Replace glow plug if out of spec; clear code and test.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
You can drive short distances in mild weather, but avoid cold starts and long trips. The vehicle may be hard to start and could cause further damage if the glow plug fails completely.
How much does it cost to fix?▼
Typically $50-$150 for a single glow plug replacement, including parts and labor. Costs may be higher if the control module or wiring needs repair.