What Does P06C2 Mean?
The glow plug circuit for cylinder 10 is operating outside its expected performance range. This code applies to large-displacement diesel engines with 10 or more cylinders, such as V10 configurations. The glow plug is not achieving the target temperature profile for cold start combustion assistance. The driver may experience cold start difficulty and cold idle roughness on the affected bank.
Common Causes
40%
Cylinder 10 glow plug element degraded with resistance outside specification
25%
High-resistance connection at the cylinder 10 glow plug — located at the extreme rear of the engine
15%
Glow plug control module output fault for cylinder 10
10%
Incorrect glow plug type installed in cylinder 10
10%
Systemic temperature sensor error affecting glow plug timing calculations
Diagnostic Steps
1
Measure cylinder 10 glow plug resistance and compare to specification and all other cylinders.
2
Perform a comparative current draw test on all glow plugs during the preheat cycle — cylinder 10 should match the average.
3
Inspect the bus bar and wiring connections at the cylinder 10 position — extreme rear locations are prone to heat damage and vibration-related loosening.
4
Check the glow plug control module output at the cylinder 10 terminal during preheat to verify proper voltage delivery.
5
If multiple glow plug range/performance codes are present, consider replacing all glow plugs as a set — this is more cost-effective on large engines where labor is the primary expense.
Estimated Repair Cost
$100 - $800
Parts + labor, varies by vehicle and location
The glow plug circuit for cylinder 10 is operating outside its expected performance range. This code applies to large-displacement diesel engines with 10 or more cylinders, such as V10 configurations. The glow plug is not achieving the target temperature profile for cold start combustion assistance....
The most common cause of P06C2 (Cylinder 10 Glow Plug Circuit Range/Performance) is: Cylinder 10 glow plug element degraded with resistance outside specification
Typical repair costs for P06C2 range from $100 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive once at operating temperature. A single glow plug issue on a V10 has less cold start impact than on a 4-cylinder, but should still be addressed before cold weather. If several glow plug codes are present, cold starting in freezing conditions may be unreliable.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P06C2 to identify the root cause.
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Quick Info
Category
Powertrain
System
Diesel Cold Start / Glow Plug System
Difficulty
Type
Generic (SAE)
Recommended Tools
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