What Does P067F Mean?
The PCM has detected a high voltage condition on the cylinder 6 glow plug control circuit, indicating an open circuit or very high resistance. The glow plug in cylinder 6 is not heating the combustion chamber as intended. The driver may experience extended cranking in cold weather, rough idle for the first minute or two after a cold start, and white smoke from unburned fuel.
Common Causes
40%
Cylinder 6 glow plug element burned open
25%
Open wire in harness between GPCM and cylinder 6
20%
Corroded or disconnected terminal at cylinder 6
10%
GPCM output driver open for cylinder 6 channel
5%
Ground circuit issue for the glow plug return path
Diagnostic Steps
1
Measure cylinder 6 glow plug resistance; OL (infinite ohms) confirms a burned-out element. Normal specification is 0.5-2.0 ohms.
2
With the connector removed from the glow plug, check for continuity in the feed wire from the GPCM output to the cylinder 6 connector end.
3
Inspect the bus bar connection at cylinder 6 (often the last in the chain) for corrosion, a broken bar section, or loose nut, as these are common failure points on rear cylinders.
4
Command GPCM activation and measure voltage at the cylinder 6 harness connector; battery voltage should be present. No voltage indicates GPCM or harness failure.
5
If the glow plug is seized, apply penetrating oil and allow it to soak before removal to avoid breaking the plug in the cylinder head.
Estimated Repair Cost
$50 - $450
Parts + labor, varies by vehicle and location
The PCM has detected a high voltage condition on the cylinder 6 glow plug control circuit, indicating an open circuit or very high resistance. The glow plug in cylinder 6 is not heating the combustion chamber as intended. The driver may experience extended cranking in cold weather, rough idle for th...
The most common cause of P067F (Cylinder 6 Glow Plug Control Circuit High) is: Cylinder 6 glow plug element burned open
Typical repair costs for P067F range from $50 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive once the engine reaches operating temperature. Cold starting in winter conditions may be unreliable. If multiple glow plugs are failing, the engine may not start at all in freezing temperatures. Plan repairs before cold weather arrives.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P067F 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
A quality scan tool helps you read codes, view live data, and clear faults.
