What Does P069D Mean?
The PCM has detected a high voltage condition on the glow plug control circuit for cylinder 10. This means the circuit is open or shorted to a voltage source, preventing the glow plug from receiving power. On large diesel engines, cylinder 10 will not be preheated for cold starting. The driver may notice extended cranking, white exhaust smoke, and rough idle during warm-up.
Common Causes
30%
Open glow plug element (burned out) on cylinder 10
30%
Open or broken wire in the control circuit between module and cylinder 10
20%
Failed glow plug control module with open output for cylinder 10
15%
Disconnected, corroded, or backed-out terminal at the glow plug connector
5%
Short to battery voltage in the control harness from adjacent wiring
Diagnostic Steps
1
Measure the resistance of the cylinder 10 glow plug; infinite/OL resistance means the element has burned open and the plug must be replaced.
2
Check continuity of the control wire from the glow plug control module to the cylinder 10 glow plug; should be near 0 ohms throughout the harness.
3
Inspect the cylinder 10 glow plug connector for signs of heat stress, corrosion, or mechanical damage from engine vibration.
4
With the glow plug disconnected, verify the control module outputs voltage during the glow cycle by measuring at the harness connector; battery voltage should be present.
5
If the glow plug is seized in the cylinder head, use a penetrating lubricant and proper extraction tools; do not use excessive force as the tip may break off in the combustion chamber.
Estimated Repair Cost
$50 - $450
Parts + labor, varies by vehicle and location
The PCM has detected a high voltage condition on the glow plug control circuit for cylinder 10. This means the circuit is open or shorted to a voltage source, preventing the glow plug from receiving power. On large diesel engines, cylinder 10 will not be preheated for cold starting. The driver may n...
The most common cause of P069D (Cylinder 10 Glow Plug Control Circuit High) is: Open glow plug element (burned out) on cylinder 10
Typical repair costs for P069D range from $50 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The vehicle is safe to drive once warmed up, but cold-start reliability is reduced. On very large diesel engines, one non-functional glow plug is less impactful than on a 4-cylinder diesel, but cold-weather starting will still be affected. Repair before cold weather.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P069D to identify the root cause.
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Quick Info
Category
Powertrain
System
Diesel Glow Plug / Cold Start System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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