What it means
The second glow plug control module reports over-temperature. Sustained current draw or insufficient cooling has driven the module above its rated temperature.
At a glance
- Usually lights the check-engine light
How it works
Glow plug control module 2 switches power to the glow plugs assigned to the second module to help a diesel engine start when cold. P263F sets when module 2 reports an over-temperature condition, which can result from an excessive current load such as a shorted glow plug or from blocked cooling airflow.
Common causes
Most likely first.
- One glow plug shorted to ground forces module overcurrent
- Cooling air channel blocked by debris
Symptoms
- Glow plug warning light on (often orange coil symbol)
- Hard cold start or no start in cold weather
- White smoke from exhaust during warm-up
How to diagnose it
- Save freeze-frame data and note engine temperature and recent cold-start conditions to identify when glow plug module 2 overheated.
- Scan for glow plug circuit and current-related codes, focusing on plugs controlled by module 2 rather than module 1.
- With the engine off and cool, inspect module 2, its connectors, and its cooling air channel for heat damage, loose terminals, or debris.
- Check module 2's harness and grounds, then test the glow plugs it controls for shorts or abnormal current draw using the manufacturer's procedure.
- Verify module 2's temperature reporting and driver operation with scan data and the specified diagnostic tests before replacing it.
Common fixes
- Clear debris blocking module 2's cooling air channel.
- Repair a heat-damaged connector or poor ground at glow plug control module 2.
- Replace a glow plug on module 2's circuit that is confirmed shorted or drawing excessive current.
- Replace module 2 only after its cooling, wiring, and glow plug loads have been checked.
Can I keep driving?
Cold starting may be difficult and repeated attempts can strain the starter and battery; continued overheating can damage module 2 further. Avoid repeated cranking and arrange diagnosis before relying on the vehicle in cold weather.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.