P052FGlow Plug Control Module 1 System Voltage
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- Diesel glow plugs are switched by a separate glow plug control module fed from the battery, with its own ground, a command from the engine module and a diagnostic line back. P052F means its supply voltage is out of range. Ford's 6.7 L and 3.0 L Power Stroke set it below 6.5 V, above 16.5 V or with an open supply, after about 1 s, continuously. An FCA bulletin shows P052F together with all six glow plug open codes P0671–P0676, because without supply no current flows – check main feed, connector and grounds first. GM does not use it.
- What you may notice
- Check engine light on
- Hard cold start, long cranking, white smoke
- Several glow plug codes at once
- Likely causes
- LikelyMain feed to the module open or high-resistance (fuse, connector, corroded ring terminal)
- PossiblePoor ground of the glow plug module
- PossibleSystem voltage too low or too high (weak battery, regulator fault)
- RareGlow plug module faulty internally
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €20 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.