What Does P06CC Mean?
The ECM has detected that the cylinder 8 glow plug is not functioning correctly on this diesel engine, applicable to V8, V10, or V12 configurations. The glow plug's electrical or thermal performance is outside the acceptable range. The driver may experience slightly harder cold starts and rough idle during warm-up, with white exhaust smoke possible in cold conditions.
Common Causes
45%
Failed cylinder 8 glow plug — element burnout, excessive resistance, or tip degradation
20%
Wiring or connector fault between GPCM and cylinder 8 glow plug
15%
Glow plug control module output driver failure for cylinder 8
12%
High-resistance ground connection at cylinder 8 or engine ground bus
8%
ECM monitoring circuit internal fault for cylinder 8
Diagnostic Steps
1
Disconnect and measure cylinder 8 glow plug resistance — expect 0.5–2.0 ohms. On most V8 diesel numbering, cylinder 8 is passenger-side rear.
2
Verify battery voltage at the cylinder 8 harness connector during the preheat cycle with the key ON and engine cold.
3
Inspect the wiring harness to cylinder 8 for heat damage, oil contamination, and connector corrosion — rear cylinders often have the most challenging wiring environments.
4
Measure current draw on the cylinder 8 glow plug circuit with a clamp ammeter during preheat and compare against cylinders on the same bank.
5
On Duramax, Power Stroke, and Cummins V8 applications, check for TSBs regarding glow plug tip swelling that can cause extraction difficulty — address before the plug seizes in the head.
Estimated Repair Cost
$80 - $450
Parts + labor, varies by vehicle and location
The ECM has detected that the cylinder 8 glow plug is not functioning correctly on this diesel engine, applicable to V8, V10, or V12 configurations. The glow plug's electrical or thermal performance is outside the acceptable range. The driver may experience slightly harder cold starts and rough idle...
The most common cause of P06CC (Cylinder 8 Glow Plug Incorrect) is: Failed cylinder 8 glow plug — element burnout, excessive resistance, or tip degradation
Typical repair costs for P06CC range from $80 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive in most conditions. On a V8 diesel, one bad glow plug has limited impact on overall starting capability. In sub-freezing temperatures, starting may require extended cranking. Monitor for additional glow plug codes — multiple failures significantly reduce cold-start reliability.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P06CC 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
OBD2 Scanner
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